2004 Foreman not running right after rebuild

1588 Views 10 Replies 5 Participants Last post by retro, Aug 20, 2019

44/45

Discussion Starter · Aug 19, 2019

Please save my marriage! I had my cylinder bored .20 over with new piston and rings and also had new valves installed by local Honda dealer. I was running the ATV 1/2 throttle in the field after ring break in and it just lost power, but yet idles. When I let it cool off it started right up again until it got hot and shut back down. Checked carb several times which is to me not the issue. Fuel flows easy when draining tank back into can. I did adjust the valves to .006 when the motor was still on the bench, so I am confident it is correct. I will be checking the coil next but do not believe it would go out at the same time as my rebuild. This thing ran flawless until my rebuild. I went through 1388 posts on this forum and found others with similar problems, but nobody comes back and posts what their solution was.

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SamUK

· #6 · Aug 19, 2019

fishfiles said:
next question I would ask is who did the machine work , maybe the tolerances are too tight on the piston and it is heating up and seizing , or maybe the wrist pin is seizing

I'm betting the same odds @fishfiles

Only other thing I can think of would be aftermarket ignition components failing giving a false fault diagnosis against the recent top end rebuild.

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SamUK

· #8 · Aug 20, 2019

44/45 said:
I'm going to pull the head this weekend and see if something is binding in the top end. The machining of the bore looked superior, and it was done to match the piston.

What brand is the piston, any idea?

Measure the bore, I'll bet you a dime to a dollar that it's 'egg shaped'!!
What are your views @retro??!

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