gs 450 EX valves hits pistons..!

[carlos020465]

Hi guys:
I rebuilt the engine, and when I cam timing, the valves hits over the pistons..!
I milled the cylinder block, here the problem.?
what is the solution...? thanks.. Carlos.

My bike:


The piston:

[BassCliff]

Hi Carlos,

It seems that your cam timing is not correct. There are a couple of 450 manuals on my website that you can download. The information should be there. I'm sorry I can not be of more help. Do you have a degree wheel?


Thank you for your indulgence,

BassCliff

[Nessism]

No need for a degree wheel. Just time the valves per the factory service manual and all will be well (unless you bent the valves).

[Guest]

You say you milled the cylinder block... if you mean you've milled the mating surface for the head or crankcase, then the only thing I can think of is to use a thicker base or head gasket to compensate.

Otherwise, it definitely sounds like your cam timing is way off as others here have already pointed out.

[rapidray]

You don't have the cams timed correctly. You would have to mill a quarter inch off to affect the timing that way. Cams are in wrong, trust me. Ray.

[carlos020465]

thank you for your help..! my friends.....! I go to work it..!