why SO hot????

first off, let me clarify that my engine is not running lean, in fact it is still rich and the plug is an oily black. It is a stock, 50cc china girl engine, with a gutted stock pipe, a bored out nt, and a billet intake. It runs great, pulls into very high rpms and is incredibly smooth. yet I have always had trouble with this engine heating up way too much. I have a temp gauge and it will easily break 450 degrees F. and keep climbing if I let it while going uphill. I am not experienced with what makes an engine run hot, but have had no problems like this with my other engines. I am thinking that maybe a more free flowing exhaust might help vent the engine better, but really have no idea. Any suggestions? -Moto



here is the most recent pic of the engine setup that I have, since that photo I have swapped the head for another stock 50cc one which has more surface area in hopes of cooling down the engine, but it make no noticeable difference:

TakeiT said:

What fuel mixture are you using?

I wouldn't advise you run your engine at that temperature, it shouldn't really be above 250. That temperature is almost red hot

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400+ is really the danger zone, according the Gordon Jennings 2 stroke tuning handbook, and the engine looks fine internally. I just really dont want it over 400 because thats the point at which aluminum starts to weaken.

I am running 32-1 redline synthetic oil, great stuff.

crassius said:

if it is only while going uphill, then float angle could be a problem

could also be heavy grease & oil coating engine between fins

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its painted black. float is a possibility..... ill go check. but it does get hot on the flats too, what height should it be?