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Author Topic: 250f blown top end, damage assesment. Valve guides/head  (Read 4129 times)

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Offline tonysoup

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250f blown top end, damage assesment. Valve guides/head
« on: March 28, 2015, 05:54:19 PM »
Hey guys, got me a kx250f she goes great downhill but uphill is a bit of a problem.

I pulled the head off, prognosis: bad tensioner and slipped timing, piston hit valves, killed piston, bore and head and valves.

my question is is it possible the head may be  salvaged?
you can see 1 valve is bent (looks to be from the valve guide) so im guessing where the valve guide seats it will be damaged.

Is this repairable ? or once the valve guide seat is no longer true its game over for the head?

cheers

Tony (forum noob!)
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Offline KXDINO

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Re: 250f blown top end, damage assesment. Valve guides/head
« Reply #1 on: March 28, 2015, 08:25:10 PM »
yes it should be repairable , by a head specialist.
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Offline LukeG

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Re: 250f blown top end, damage assesment. Valve guides/head
« Reply #2 on: March 28, 2015, 09:30:40 PM »
Guides and seat can be replaced or repaired. Cam cap damage is something to look out for depending on how bad the timing slipped.
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1990 KX250 - Wanna be road racer!
2007 DRZ 462 Motard

Offline tonysoup

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Re: 250f blown top end, damage assesment. Valve guides/head
« Reply #3 on: March 29, 2015, 10:25:27 AM »
that would be awesome. sweet ill find a head guy.

cams look alright but ill get them tested
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