04 yz450f intake and exhaust clearances help!

1 reply to this topic
  • cmgyz450fs77

Posted March 31, 2013 - 01:18 PM


have a 04 yz450fs bought it did a cylinder leak down test shot 100 psi in to the head and found i had a leak and it was coming straight out my exhaust did the compression test had 60 psi after 5 kicks so i took it apart and discovered that 1 of the exhaust valves was hung open and the other did not have a shim! intake is fine have .010 from bottom of lobe to bucket now with no shims in exhaust i have .024 tho from bottom of lobe to the bucket! this is my first shim and bucket setup ive ever done im looking for the proper clerences for the in take and exhaust? if anyone can help be greatly appreciated

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  • grayracer513

Posted April 01, 2013 - 06:45 AM


Intakes: .004-'006" (0.10-0.15mm)
Exhausts: .008-.010" (0.20-0.25mm)


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