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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Some cylinder head questions (with pics)
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[QUOTE="Rich Rohrich, post: 1372932, member: 16241"] Scotchbrite, are you nuts? :ohmy: Even with the lack of detail in the pictures it's obvious the exhaust seats are [b]trashed[/b] and need to be re-cut. The exhaust valve faces are clearly eroded and need to be reground, or replaced (the scag in pump gas is likely the root cause here). Valve replacement is probably easier and maybe end up cheaper than getting them properly reground. It's hard to tell for sure from the pictures, but it's unlikely the intakes are in much better shape. The intake seats look bad (hammered to an unacceptable width) in the pics. Get a real valve job from a shop that has the proper (read big $$$$ ) valve seat cutting equipment and the skill to use it on small valves and replace the valves and springs. Given that you don't live on the limiter you'd be well served by going to a full Kibblewhite stainless steel valve kit with their double valve spring race kit. Starting with a proper valve job most riders in applications similar to yours get a couple of hundred hours out of the Kibblewhite valves and the springs. Money well spent for most. :cool: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Some cylinder head questions (with pics)
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