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smdonald

Mangled Head

11 posts in this topic

So i got another 426 from a guy who owed me money but the thing is not running...im going to get it going again but i need quite a large amount of parts...

What happened to it was the cam chain slipped due to exsessive wear and stretching and the piston smashed 2 of the exhaust valves. one broke off and embedded into the top of the piston. As the engine wound down after this catastrophic failure, the valve that was in the piston hit center of the cylinder between all the valve seats.. its pretty gouged but the head doesnt look to be cracked.

Is it safe and/or practical to try and clean up the old head and try and use it again?? New heads are around $550 and im trying to get by w/o buying one.

What do yall think??

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There are some machine shops that specialize in head repair, send it to one of them for evaluation. :smirk:

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I don't think I would take the chance on that used head. I'd go with a new one, since you need new valves, guides, springs, seals, piston, rings, anyway. The killer for me was that the valve was rammed into the head by the piston, according to your post.

Grayracer would know better than I do, so hopefully he'll chime in with his advice.

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Replace the head. Trying to salvage it will probably be a continued nightmare.

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i have the same thoughts on using the old head. it might be more trouble than its worth. i looked at it closer today and the gouges go into the seats for the valves...not sure if that can be repaired??

my guess is try to find a used one off a parts bike...

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Engine Dynamics is another first rate shop that repairs this kind of damage. You also might try e-bay for used ones, and also check out Eric Gorr's web site in the "Garage Sale" section. Sometimes he has soe killer deals on older stuff. You can use a head from 98-02, though the 90 and 99 400 heads take a little mod. If you end up with one of those, PM me and I can give you the poop.

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Engine Dynamics Company, LLC , is EDCo.

Thanks, I had not heard them called that before...

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i called milenium today, repair and valve job 600 bucks, called EDCo, repair and valve job 450. not as cheap as i thought. still beats a new head.

i think i'll shop around for a used one. i cant find any on ebay or craigslist. maybe someone knows of a salvage yard????

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