Mercury 75hp 2 Stroke ProblemsMixture Screws The first thing to check before anything else is the mixture screws. Print Out This Guide: Mercury Outboard Troubleshooting. Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum. 9/5(238 ratings) Updated: 05/11/2023. (22 pages) Outboard Motor Mercury Optimax 115 Service Manual. 75hp mercury 2 stroke issues. ran rough, took it back to the shop they replaced the cdi box, better but still wont open up, drain fuel and replace. Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boat’s fuel line. (141 pages) Outboard Motor Mercury 73012 Installation And Operation Manual. Corroded Spark Plug Wiring Corroded or fouled spark plug wires can also cause the outboard motor to sputter or lose power. Another problem is the outboard may get stuck in the gear whether the gear is in neutral or forward. NOTE: Old spark plugs covered in either carbon or oil indicate severe problems with the motor, such as low engine compression or a leaking head gasket. One of the most common problems that mercury outboard faces are complications of battery issue. Console remote control (19 pages) Outboard Motor Mercury 9. Founded in 1939, the company now has locations around the world. Mercury Mariner Outboard Forum. Disconnect the Mercury Outboard switch and reset, if the engine fires, replace the Mercury Outboard switch. I have also had 2 new 15 hp Yamaha 2 strokes on aluminium dinghies, which were great. And because they don’t have to work as hard as heavier engines or. Since your motor has set for a while you may need to do the same. Oil flow sensor blocked sticky or just no oil getting through the sensor. First, check the battery state and make sure it is charged enough to start the engine. I think the over heating alarm was beeping at me too while I was out. Hi all, My 2 stroke Mercury (75 HP) sounds an alarm (most probably high temperature) when cruising in medium RPM (speed 10-12 knots) and especially when there are medium waves. Sometimes, the shifter in the tiller gets stuck in the forward gear. If the voltage is less than 9 1/2 volts during cranking there is a problem in the battery s or the Ignition switch Box. Good boating! X xmos Cadet Joined May 22, 2009 Messages 13. Engine protection operator warning system. 2002 2 stroke 75 hp mecury, any good? any known problems. Visitors, please register to join in. This situation is not happening when cruising very slow (6-8 Knots) or fast. One of the first things I encountered with my 75 HP was that it would not idle properly. The test procedures at the end of this brochure are intended to give the technician a better understanding of the most common failures and allow testing with minimal equipment. Mercury Outboard Cranks But Won’t Start. If so you need a carb kit and cleaning. However, when the motor warms up, after half an hour or so, and he goes to put the power down after idling etc, the motor splutters after about 4000 rpm, he can't get full revs and he can only idle around. Sometimes you can swap these to see if a problem follows the switchbox. MERCURY 2 STROKE OUTBOARD POOR IDLE TROUBLESHOOTING WITH SIMPLE SOLUTION Small town Bassin' 7. Faulty Impeller. Rot and decay are other reasons why your fuel line may start leaking. (574 pages) Outboard Motor Mercury 75 OptiMax Owner's Manual. I had similar probs with my Johno 60. Charge or replace if necessary. Limited RPM at WOT can be caused by one of three things; 1 limited fuel flow - squeeze the primer bulb to see if RPM increases, if so, rebuild the fuel pump. Thread starter Boatman paul75; Start date Jul 28, 2021; B. 75 outboard motor pdf manual download. Just that 2 strokes seem to run a but smoother in multiples of three cylinders. Mercury Outboard Engine Won’t Start (Troubleshooting Guide). The two parts of the fuel pump that are most commonly the source of problems are the diaphragm and the one-way valves. 5 Operation & Maintenance Manual. Breakerless NGK-BUHW-2 or AC-V40 FFK or Champion L78V Recommended Spark Plug Cylinder Firing Order 1-3-2. 75 mercury 2 stroke losing rpm’s under load in water. Remove the air intake cover and spark plug wires. Can anyone shed any light on what these motors are like and if there's. The following day it has started on the drive no problem. It’s true that the Mercury 75 hp two-stroke, like its E-TEC and OptiMax competition, doesn’t have the smoothness of Honda’s four-cylinder BF75, but it’s substantially lighter and power delivery is quicker — important in situations like bar crossings. As a result, you will experience your outboard motor’s RPM fluctuating up and down. Jan 28, 2015 #1 Im working on a 2002 Mercury 75 HP two stroke 3 cyl carb motor. A faulty ignition switch can cause all sorts of problems with your ignition system and is more often than not overlooked. The fuel air mixture screws on the side of the carburettor are marked H for High for the engines high speed adjustments and the L. If i bring throttle to idle and the boat rest for 1-2 minutes the "alarm" goes off. It appears that it is over oiling somehow as the exhaust is spitting oil and fuel. I just bought a 2004 fisher boat with a 75hp merc on it. If it's a 75hp triple it may be a year or two newer than 1985. I have a Mercury 75-HP outboard, on a used boat I bought a few months ago. 75hp mercury 2 stroke not starting. Each to their own re motor brands etc. , but just wondering if any of you had experienced. Posts: 41 August 30, 2020 at 2:32 pm #1969270 Heres what I got, ran great then just lost power by like 10 mph WOT, took it in and carbs cleaned and synced, new plugs, still. The idle circuit is somewhat independent of the high speed circuit being higher in the carb, and this keeps it out of the gunk that gasoline forms when allowed to evaporate from sitting up. The fuel air mixture screws on the side of the carburettor are marked H for High for the engines high speed adjustments and the L means Low for the engines low speed adjustments. Outboard Idling Rough? Here's Why & What To Do!. The 75 optimax runs real quiet and it plains the bout out real quick, The engine has like a four hour break-in period that kind a pain in the tail but not too bad. Just that 2 strokes seem to run a but smoother in multiples of three cylinders. Re: Mercury 75hp 2 stroke problem The motor is going in to limp mode from possibly one of the following. 75/90/115 efi 4-stroke (62 pages) Outboard Motor Mercury 60 Manual. Mercury 75 TwoStroke Operation, Maintenance. The Mercury 75-HP outboard started to vibrate at idle and at higher speeds; there is a very noticeable miss when at idle, as well. The most common problems are the stiffness of the gear. 10 Reasons Why A 2 Stroke Engine May Lose Power. The first thing to check before anything else is the mixture screws. Problem: Engine Runs Too Lean Possible Cause Corrective Action Carburetor is loose. I've got a problem with the engine. The engine began smoking at running speeds and according to the owner it felt like it was "missing a gear". 1997 Mercury Force 75 HP 2. Common Mercury 75hp 4 Stroke Problems. By using this forum I found that the fuel pump diaphragm needed replacing which was an easy fix for around $20 for a rebuild kit. Almost all types of boats have a pump that feeds the engine water. Unscrew the carburetor bowl and remove it. Rough running can have a variety of causes, including fuel pump failure, air-fuel mixture issues, ignition system problems, and others. I have a 2004 Mercury 200-HP EFI Saltwater edition outboard. Use a carburetor cleaning kit to clean all the parts of the carburetor. If it is charged enough but still not responding, then discharge it. swist: posted 12-07-2007 06:44 PM ET (US). All in all, Mercury 75hp 4 stroke is a reliable outboard that offers users with medium-sized boats a powerful hole shot, exceptional speed, and consistent rpm. But sort of a noticeable squeaking. Hi guys I've been given a 75hp mercury 2 stroke 3 cylinder its not started in about 3 years so it's had new plugs fresh fuel im turning the key and nothing is happening so I've tried crossing the solenoid and its slowly turning over but thats about it could it be a power issue I've got a voltage meter but what should I check because I'm not. Diagnosing Outboard Idling Problems. The ignition switch sends a signal to the solenoid when you turn your key allowing it to open; this allows voltage from your battery to pass through it to the starter motor. If it's a 75hp triple it may be a year or two newer than 1985. This profile has not been claimed by the company. Battery cables or connections loose or corroded. 32K subscribers 310K views 3 years ago MERCURY OUTBOARD TROUBLESHOOTING & REPAIR Here is a. Mercury is not going anywhere and service is easy to find. All in all, Mercury 75hp 4 stroke is a reliable outboard that offers users with medium-sized boats a powerful hole shot, exceptional speed, and consistent rpm. MERCURY 2 STROKE OUTBOARD POOR IDLE TROUBLESHOOTING WITH SIMPLE SOLUTION Small town Bassin' 7. Internal rusting in the forward cable may also cause this. However, the advantages of a four stroke outboard are many. One of the first things I encountered with my 75 HP was that it would not idle properly. Mercury outboard overheating. Mercury Marine. As you shift the gear, it also makes steady clanky noises sometimes. So, if you're looking for something that will help you maneuver through rough water conditions, then this might just be the ideal pick for you. Cooling temp sensor as above, or water flow sensor sinking has a hole in it ? One or two coil packs breaking down at temp shutting down one or 2 cylinders. (133 pages) Outboard Motor Mercury 75 HP Installation. 2 stroke and had the same problem,it drives you crazy. 75/90/115 efi 4-stroke (62 pages) Outboard Motor Mercury 60 Manual. Another major cause of overheating of your boat’s Mercury outboard engine is the failure of the wiring and tear or water pump impeller. 60 amp / 756 watt (Belt-Driven) Recommended fuel. The ignition switch sends a signal to the solenoid when you turn your key allowing it to open; this allows voltage from your. I have changed the fuel filter due to the old one looking very bad. MERCURY 2 STROKE OUTBOARD POOR IDLE TROUBLESHOOTING WITH. The inner rubber diaphragm can develop cracks or pin holes that effect proper fuel flow, and inner check valves and springs can break causing complete pump failure. 4-stroke (87 pages) Outboard Motor Mercury 115 Manuam it is found that Theory Of Operation the anti-siphon valve is the cause of the problem, The fuel pump is a crankcase-pressure. If you're turning your key and the starter motor isn't cranking then you may have a faulty solenoid. Diagnosing Cause of Misfire and Vibration in Mercury Outboard. Connerbrown56; 60 HP 4 Stroke EFI 2015 - idling problem. com">Smoking 75 HP two stroke. Starter Solenoid This is effectively a gate. 2 Stroke Engine May Lose Power. Hi guys I've been given a 75hp mercury 2 stroke 3 cylinder its not started in about 3 years so it's had new plugs fresh fuel im turning the key and nothing is happening so I've tried crossing the solenoid and its slowly turning over but thats about it could it be a power issue I've got a voltage meter but what should I check because I'm not. 75/90/115 efi 4-stroke (62 pages) Outboard Motor Mercury 60 Manual. 75 mercury 2 stroke losing rpm’s under load in water. Let’s take a look at seven reasons why your outboard won’t throttle up and how to fix them: Tangled Propeller Poor Gas Quality Clogged Fuel Filter Fuel Hose Replacement Faulty Impeller Bad Spark Plugs Malfunctioning Fuel Pump 1. Corroded Spark Plug Wiring Corroded or. I have a Mercury 75-HP outboard, on a used boat I bought a few months ago. The engine is a 1999 mercury 75 hp 2 stroke. Stiff prop during shifting may also be the cause. I have had a mid 1970's 3 cylinder 70 Johnson 2 stroke (olive green leg - which was a great motor even at 20+ years old), plus a 1999 (from new) 3 cylinder 70hp Yamaha 2 stroke which was great as well. Stator as Cause of Poor Acceleration Under Load. 5: Mercury 650 coil: 3: 75 hp no signal to the coil MERCURY/MARINER 75hp OUTBOARD: 2: Mariner coil: 4: Spark plug coil: 1: What's this extra coil part do? 6. (22 pages) Outboard Motor Mercury Optimax 115 Service Manual. Mercury 75 hp problems. See if it leaks out the side of it, common problem. Hi, I'm looking at buying a boat this weekend. By controlling the air that is being fed to the engine. Mercury Marine has been powering boats for over 75 years. Check batter for state-of-charge. Problems tend to stem from these two sources – failure of the impeller, or a partial blockage of the waterways by salt and calcium deposits. Closest sound I can describe it to is like a bearing starting to go out. Mercury Outboard Engine Won’t Start (Troubleshooting Guide)">Mercury Outboard Engine Won’t Start (Troubleshooting Guide). Assuming you have a 25hp Mercury outboard engine, here are the steps you need to take to clean the carburetor: 1. After about 10 min I got life and made it into a nearby bay where it stopped and re started no problem. I brought it out for the first time and when I give it full throttle it's acting like it's only at half throttle and won't rev higher. After trying many things I added a second O ring and voila, problem fixed for less than $1 ! The only other fix is a new oil tank for $$$$$. Why Your Outboard Motor is Not Running at Full Power. The engine ran like a top until a few weeks ago. Debris such as fishing line, excessive seaweed, beer can rings, or nearly any other material can wrap around the propeller and its spindle. (32 pages) Outboard Motor Mercury 4. Three, maybe four years ago I had the burned yellow wires you speak of. I had a 2005 Mercury 75 HP. The typical two stroke outboard carb has two systems so to speak. Recently, the continous tone or horn starting blaring [when the motor is running at about] 1,200-RPM, after returning back from about 45 minutes of higher speed running, 4,000-RPM. See reviews below to learn more or submit your own review. Outboard Motor Mercury 75 HP Installation Manual. Here are 10 reasons and fixes to help prevent lack of fuel to a 2-stroke engine. I know that some mercury motors have earned the reputation as the "black anchor". 75hp mercury 2 stroke issues. net">Diagnosing Outboard Idling Problems. Also for: 75 marathon, 75 sea pro, 115, 125, 65/80 jet, 90, 100. (32 pages) Outboard Motor Mercury 4. Direct fuel injection (522 pages) Outboard Motor Mercury 75 OptiMax Owner's Manual. This scenario arises when your boat engine is off and is on the trailer. One of the first signs that the powerhead isn’t getting enough air or fuel is when the motor stalls, particularly when idling. Was my own fault, ran the dreaded ethanol, which made a blockage in the carby. Just did plugs, and coil(was cracked). to Fix Mercury Outboard Overheat Alarm? (Explained)">How to Fix Mercury Outboard Overheat Alarm? (Explained). This makes it hard for you to shift the gear forward. Two stroke outboard engines worked for over 100 years. Mercury outboard will not start Batter switch is not turned ON or faulty switch. It is always interesting to take these problems to their ultimate resolution and have the final fix revealed, assuming there is one. Outboard Motor Mercury 75 Service Manual. Mercury BEEEEEEEEP Continuous Alarm. Common Mercury Outboard Shifting Problems. Let’s take a look at seven reasons why your outboard won’t throttle up and how to fix them: Tangled Propeller Poor Gas Quality Clogged Fuel Filter Fuel Hose Replacement Faulty Impeller Bad Spark Plugs Malfunctioning Fuel Pump 1. The first thing I would do that’s easy is check the gearlube. If you plan to keep the engine for a long time, you may want to step up to a new four stroke. Outboard Motor is Not Running at Full Power">Why Your Outboard Motor is Not Running at Full Power. Mercury’s focus has always been innovation, great engineering and. Mercury Mariner Outboard Forum | Boat Repair Forum New posts Search forums Welcome to the updated forum! Existing members please log in with your current user name and password, or use the forgot password option. If it’s low or burnt or if there’s a lot of water in it you might be loosing your pinion bearing in the gearcase. VOM (Volt-Ohm-Meter) Multimeter A. The Mercury 75-HP outboard started to vibrate at idle and at higher speeds; there is a very noticeable miss when at idle, as well. First, remove the carburetor from the engine and disassemble it. Older motors can have pre-ethanol components that should be upgraded to new ethanol resistant materials. In addition, an improper air-fuel ratio can also cause poor engine performance. The OEDA 3 Star Mercury 75 develops 74. Assuming you have a 25hp Mercury outboard engine, here are the steps you need to take to clean the carburetor: 1. Mercury FourStroke Oil 10W-30. When my 2001 75ELPTO sneezes at low to low mid RPM that's when I know to change the plugs, and it goes away. Mercury outboard will not start Batter switch is not turned ON or faulty switch. I have had a mid 1970's 3 cylinder 70 Johnson 2 stroke (olive green leg - which was a great motor even at 20+ years old), plus a 1999 (from new) 3 cylinder 70hp Yamaha 2 stroke which was great as well. Pump the bulb up and push on that sm blue rod that sticks up out on the side of the carb,it's right in front of the starter,it's the primer button,when you pull out the choke it pushes on that. If you’re having trouble with your 25 hp Mercury outboard’s carburetor, here’s how to rebuild it. Mercury Marine Reviews on Cost, Reliability & More ">138 Mercury Marine Reviews on Cost, Reliability & More. ran rough, took it back to the shop they replaced the cdi box, better but still wont open up, drain fuel and replace, new filter, better but still lacking, any help?. Home Forums Outboard Motors Forum Mercury Mariner Outboard Forum Post thread. 0hp at 5500rpm with a wide open throttle (WOT) rpm range of 5150 to 5850. But check with a good Mercury mechanic before trying that! Let us know if you find the remedy. Analog meter- The analog VOM is a. Its fitted with a 2002 Mercury 75hp 2 stroke. A rough-running Mercury 75 hp four-stroke engine can be a sign of serious engine problems; it is often possible to diagnose and address these issues with the right tools and expertise. Turn the key to ON and push in and hold for 15 seconds (priming. Turn battery switch on or test switch. A big part of troubleshooting with a water pressure gauge is to monitor the changes in PSI at various RPMs and then consider the troubleshooting chart to either eliminate or narrow down the possible causes. Re: 1998 Mercury 75hp 3-Cylinder 2-Stroke Problem There is only one stator which contains both the low speed, high speed, and charging windings. The gear may get so stiff for 3 reasons. So, if you’re looking for something that will help you maneuver through rough water conditions, then this might just be the ideal pick for you. After a further half hour or so it wouldn't re start and ended our day early with a tow home. The most common problems are the stiffness of the gear. Outboard engine cooling system problems. Whatever the cause, the only way to fix your fuel line air leak is to replace the damaged line. Here are 10 reasons and fixes to help prevent lack of fuel to a 2-stroke engine. Rot and decay are other reasons why your fuel line may start leaking. Inspect the fuel filters and the air filter too if your outboard has one. I have a Mercury 75-HP outboard, on a used boat I bought a few months ago. The motor idles perfectly, and when put into gear has no problems, and can use full throttle. The other thing to do is to find out if it’s the engine or gearcase side that’s squeeling. The throttle stop screws will mainly just adjust the opening of the throttle plates feeding the air to the intake manifold. Check the voltage on the red and white Ignition wires at the CD Unit. It could be due to tied wires to the cable. Some of the smallest outboard motors, with no gear selector,. Compatible with SmartCraft digital technology. Most of the two-strokes and the carbureted engines control the idle RPM through idle stop screws and idle airscrews. A faulty ignition switch can cause all sorts of problems with your ignition system and is more often than not overlooked. To test them, it will be easiest to remove the pump from the engine. Mercury 25 Hp 2 Stroke Carburetor Problems. Re: Mercury 75hp 2 stroke problem. 2 Stroke 90 HP Mercury Optimax?">Should I purchase a 2 Stroke 90 HP Mercury Optimax?. Tangled Propeller If your outboard motor will not throttle up, the issue may be as simple as a tangle. View and Download Mercury 75 service manual online. Outboard Runs Poorly When Idling The checklist for an outboard that remains running poorly at idle is the same as for when it stalls while idling. Over time the tank neck gets stretched and no matter how much you tighten it , it still will leak oil. Clean or replace the filters, and also drain any water from the fuel/water separator if you have one. I have also had 2 new 15 hp Yamaha 2 strokes on aluminium dinghies, which were great. Boatman paul75 prime till you get a hard bulb (if you can't carb-fuel line problems), advance throttle off idle, half way to WOT but be ready to pull it back to idle if it lights off. Hi guys I've been given a 75hp mercury 2 stroke 3 cylinder its not started in about 3 years so it's had new plugs fresh fuel im turning the key and nothing is. August 30, 2020 at 2:32 pm #1969270. MERCURY 2 STROKE OUTBOARD POOR IDLE TROUBLESHOOTING WITH SIMPLE SOLUTION Small town Bassin' 7. Direct fuel injection (522 pages) Outboard Motor Mercury 75 OptiMax Owner's Manual. Problem 1: Gear Is Too Stiff to Shift Forward. Some other causes of poor performance in a Mercury 75 hp four-stroke outboard motor may include defective valves, a clogged air filter, or an improperly adjusted throttle. After a reasonable run at normal cruising speed (20 min @ 3500 - 4000rpm) and a bit of a. The first thing I would do that’s easy is check the gearlube. I immediately checked the water pump stream, and it is good and strong. I've got a problem with the engine. 3mm) Engine Type 3 Cylinder, 2 Cycle Ignition Type C. Re: 1998 Mercury 75hp 3-Cylinder 2-Stroke Problem There is only one stator which contains both the low speed, high speed, and charging windings. Stroke 2. Problem 1: Gear Is Too Stiff to Shift Forward. MathiasB; May 4, 2023; Replies 0 Views 31. A rough-running Mercury 75 hp four-stroke engine can be a sign of serious engine problems; it is often possible to diagnose and. Although from what I understand this is more reserved for some of the earlier 4 stroke versions. The yellow wire coming from under the flywheel AND the yellow wire where it plugs into the regulator. Inside the pumps is a small rubber impeller that keeps the engine cool by supplying cold water to your boat’s engine, just like a paddle wheel. Heres what I got, ran great then just lost power by like 10 mph WOT, took it in and carbs cleaned and synced, new plugs, still. Test Equipment and Measurements I. Re: 1998 Mercury 75hp 3-Cylinder 2-Stroke Problem There is only one stator which contains both the low speed, high speed, and charging windings. After about 10 min I got life and made it into a nearby bay where it stopped and re started no problem. Jan 28, 2015 #1 Im working on a 2002 Mercury 75 HP two stroke 3 cyl carb motor. Crafted for less weight and high displacement, they generate abundant torque and immediate power. Re: 1998 Mercury 75hp 3-Cylinder 2-Stroke Problem There is only one stator which contains both the low speed, high speed, and charging windings. 1 kw) 650 - 700 Full Throttle RPM Range 4750 - 5250 5000 - 5500 Piston Replacement 71. -W L Laddies Banned Joined Sep 10, 2004 Messages 12,218 May 2, 2006 #10 Re: 1985 Mercury 75hp-known issues?. NOTE: Old spark plugs covered in either carbon or oil indicate severe problems with the motor, such as low engine compression or a leaking head gasket. 7 Reasons Your Outboard Will Not Throttle Up and How To Fix. Mercury Marine has been powering boats for over 75 years. 9 TwoStroke Operation, Maintenance. It’s true that the Mercury 75 hp two-stroke, like its E-TEC and OptiMax competition, doesn’t have the smoothness of Honda’s four-cylinder BF75, but it’s substantially lighter and power delivery is quicker — important in situations like bar crossings. In case this happens, there will be a constant fluctuation in the fuel supply pumped into your boat’s carburetors. problems will be diagnosed with less complicated equipment. The last few times out my 40 hp Mercury outboard (2-stroke, 2004 model year) has made sort of a squealing or screeching noise at idle or low speed. Sometimes you can swap these to see if a problem follows the switchbox. The most common problems are the stiffness of the gear. Mercury Outboard Troubleshooting ">Print Out This Guide: Mercury Outboard Troubleshooting. The three-cylinder powerhead displaces 1267cc and produces 120Nm of torque at. Tighten cover or replace gas- cover. It would had been nice to try out the four stroke 60 to compare the two. 2: Mariner 50 4cyl 4 stroke suspect coil pack: 11: Mercury 25 wiring diagram: 4: 79' Merc 140; having problems with response time. Mercury Mariner Outboard Forum | Boat Repair Forum New posts Search forums Welcome to the updated forum! Existing members please log in with your current user name and password, or use the forgot password option. Again recharge it and then try to start. If your outboard motor will not throttle up, the issue may be as simple as a tangle. 32K subscribers 310K views 3 years. 4-stroke (19 pages) Outboard Motor Mercury 75 Pro XS FourStroke Operation Maintenance Installation Warranty Manual. Pump the bulb up and push on that sm blue rod that sticks up out on the side of the carb,it's right in front of the starter,it's the primer button,when you pull out the. problems will be diagnosed with less complicated equipment. Air leaks past mixing chamber Tighten bolts securely. Limited RPM at WOT can be caused by one of three things; 1 limited fuel flow - squeeze the primer bulb to see if RPM increases, if so, rebuild the fuel pump. Your Outboard Will Not Throttle Up and How To Fix ">7 Reasons Your Outboard Will Not Throttle Up and How To Fix. After a reasonable run at normal cruising speed (20 min @ 3500 - 4000rpm) and a bit of a drift for 5 or 10 min I couldn't restart it. The typical two stroke outboard carb has two systems so to speak. Sometimes, the shifter in the tiller gets stuck in the. If I throttle up to about 7 or 8 mph the overheat alarm sounds.