2004 crf450 valve clearances

[will pattison]

can anybody tell me the proper exhaust and intake valve clearances for the 04 crf450? anybody got the shop manual and the ability to scan the valve clearance charts? it would be much appreciated!

wp.

 

[Rich Rohrich]

From the 2002 manual -

Intake - 0.16mm +- 0.03mm (0.0063" +- 0.0012")
Exhaust - 028mm +- 0.03mm (0.0110" +- 0.0012")

 

[snb73]

Will,

intake: 0.005 +/- 0.001 in (0.12 +/- 0.03 mm)

exhaust: 0.011 +/- 0.001 in (0.28 +/- 0.03 mm)

Hope this helps, Steve.

 

[magneto]

Just curious, why do the exhausts run approx. twice the clearance of the intakes?

 

[will pattison]

:bang:

rich posts some from the 200-TWO manual.

snb73 posts some from i don't know what but i assume is 2004.

both look similar to the 05 spex.

:whoa:

wp.

 

[Rich Rohrich]

Will - If you are running the OEM valves and fresh OEM springs I've found you can run any of the CRF450s the tight side of the 2002 spec so the specs that snb73 posted are for our purposes the same as the spec I posted. I should have been more clear in my original post. Sorry about that.

Just curious, why do the exhausts run approx. twice the clearance of the intakes?

Lots more heat on the exhaust side along with a different valve material and a different actuating mechanism make for a different level of expansion in the parts.