300/440/550 No Power and running hot - 550SX

[Parsonsjb88]

I have a 550SX that has a Factory pipe and new stainless impeller with everything stock. Cranking compression is about 150 each, starts very easy, runs great, until it doesnt. Once it warms up its gutless, and starts losing more and more power to the point where you can barely stand up on it. Also running extremely hot, cant put your hand under the pisser water at all without risking burning yourself and you can see it steaming as it comes out.

SO my question, what the hell is wrong? My first thought is a leak in the crankcase, maybe crank seals? Any other suggestions to check out? Thanks in advance!

 

[Parsonsjb88]

I should say that it idles perfect, not lean, and I even tried richening the high speed 1/4 turn to see if it was running lean and it started smoking out the exhaust and ran worse, so I feel like thats a decent sign its not lean at the carbs.

 

[Fleabags]

Are you sure you have the cooling lines routed properly? What about sand or other obstructions in your lines?

 

[Parsonsjb88]

Water flows fine out the pisser. I know that doesn't mean much. But it ran perfect last year hours on end, and I haven't changed any cooling hose routing.

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[dose]

Was it running good before you put on the factory pipe?

If you just put on a 1/2 pipe there is a gasket that has to be changed to let water cool the pipe

 

[Parsonsjb88]

Bought it with the pipe too. Only thing I changed was the impeller cause the stock one was missing chunks out of it

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[Parsonsjb88]

Just found out my 550SX high speed was way too rich, like nearly 2 turns out when it should be according to factory pipe, around 7/8 turn out. Would running really rich cause it to overheat? Obviously lean does, but ive never heard of rich causing overheating?

 

[Roseand]

Just found out my 550SX high speed was way too rich, like nearly 2 turns out when it should be according to factory pipe, around 7/8 turn out. Would running really rich cause it to overheat? Obviously lean does, but ive never heard of rich causing overheating?

No. That would cause it to run cooler if anything.

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[redlines]

http://www.parkeryamaha.com/coffman550ccclimaxgasketkit.aspx