Rebuilding top end of 01 YZ426F. Help

What all needs to be replaced & and what all needs to be looked @. So far I have New Oem cylinder, piston, gasket kit. First time tearing bike engine open.

All depends on hours on the parts. IMO valve seats, springs, cams, timing chain, connecting rod bearing, combustion chamber might be missing some things

All depends on hours on the parts. IMO valve seats, springs, cams, timing chain, connecting rod bearing, combustion chamber might be missing some things

hey thx for reply, looking into it all now

I just got some rebuilding my top end last week after a complete tear down of the bike just checking and some powdercoating only problem I found with mine was the cylinder was worn 20 thousandths bigger than it should have been. The rebuild really put the power back into it and didn't change a lot just exhaust and a new jet in the carb.ImageUploadedByThumper Talk1390577380.048319.jpg

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