Question about 2005 Honda FMX 650

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Overheating What happens when a bike overheats? Does it automatically kill the engine? Will the engine restart before it has cooled enough? I was accelerating onto the freeway and the engine just shut off. When I pulled over and tried to restart the engine, it wouldn't start. There was still power and when I hit the start button the light would dim showing me that current was being drawn by the starter. But the engine didn't even try to turn over. About an hour later, the bike started fine (after I moved the bike home in the truck...) Later I noticed that the coolent was a little low and was wondering if overheating could cause this problem. Otherwise it seems to be something electrical, like a short somewhere.

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If you did indeed overheat the engine to the point that is stuck, you would probably know it by the antifreeze being poured all over the ground. The bike would be really hot just sitting on it. It would smell like antifreeze and just smell hot.. I know, smell hot? but an engine that has been ran to hot has a pretty distinctive hot smell... It doesnt sound like an overheating situation if none of the above happened. A bike that is overheating will begin to loose power before it stops. LIke lacuna said, everything inside of the engine will start to expand from the heat and the piston will stick in the cylinder. Most of the time when this happens, the bike will cool off and restart. But, usually with problems. Warped or cracked head, cracked block, broken piston rings. These engines are aluminum and dont like to be overheated and warp really easy. If the engine is really hot, it will not turn over until it cools down enough. Im not saying it couldnt have overheated and then restarted without any problems, its happened before, but just not likely. But, if this is the case, take lacunas advice and change all of the fluids. Your oil will be nasty. Maybe get ahold of the previous owner and see if it has had any probems. It kinda sounds electrical to me. as long as the above overheating signs didnt happen. If you dont think it was overheating and it happens again, try to push start the bike to see if the engine turns over. even putting the bike in second or third gear just see if you can move the bike back and forth. If nothing else, you'll at least know its not locked up.

Posted on Nov 20, 2008

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I start my bike and after 4 5 second engine hed is very hot

Some description of 2-stroke or 4-stroke, number of cylinders, type of cooling would have been useful.

In mild or hot weather the head of an air cooled bike could conceivably be hand-hot in 45 seconds but mostly it would take considerably longer, especially if the engine is a 4-stroke. Of course just because an engine heats up quickly it doesn't mean it will overheat in use and air-cooled engines should not be operated for long while the bike is stationary, except in cold weather, but be put into normal use as soon as possible after starting.

If the engine is overheating there are various things that could influence or cause it. Ignition timing, valve timing, fuel air mixture, lubrication, detonation, restricted exhaust...

Good luck!

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How to solve overheating?

If this is a water cooled bike, it seems to be that your thermostat isn't working properly, or your fluid level is low. Check the antifreeze if low fill to proper level, if ok then replace thermostat. If this is an air cooled bike then you need to check the motor oil. I would recommend changing it and replacing it with the proper weight and capacity if it isn't low/empty. Hope this helps

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What model/type is your bike?
Is it water or air cooled?
Does it have a cooling fan?
Does it overheat when in motion or only in very slow traffic?
What indication do you have that it's overheating?

The solution will depend on the answer to these questions.

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1 Answer

Bike starts and runs but when it warms up (running for about 20 30 minutes) it won't start back up until it cools down...and it's not running hot...can you please assist me

Overheating. The raditor coolant or the cooling fan is'nt working corectly the engine should be as hot as it's going to get in 5 minutes then the therostae opens to start keeping it at the same temperture if the coolant or the fan can't keepit at this temperture it'll not restsate till it's cool enough to be in the safe range agin. Some times not changind the oil often enough can case this problem too low coolant and the fan not working all can cause this after finding the coolant system problem and fixing it change the oil as it'll be ruiened from the overheat. Low speed hotrodding and stop and go traffic can trash the oil and just a few hot runs acan make it need and oil change as the oil fails at high tempertures and the oil is an important part of the cooling system as it's cooler beng clean and in the air flow. As the oil cooler doesn't have the benifit of a fan sitting running and hotrodding at low speeds will heat and kill the oil then after the oils killed then it'll overheat case the oils bad.

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