View Full Version : XR400 HRC compression
30-08-2005, 11:01 PM
Does nayone know what the compression ration for an XR400 is fitted with the HRC high compression piston is ??? Is it worth putting one in???
The HRC Power Up booklet says 11.0:1
I run a JE piston in mine. I think it is high 10 compression ratio.
Certainly worth doing. Extra low down acceleration out of corners.
06-09-2005, 12:31 AM
I have a 98 XR400 with the HRC kit that is piston, cam & clutch basket. Really big difference to the standard 400, but with the 11: 1 piston you have to run prieum fuel or it does not run to well. But much nicer to ride easy on the mono & plenty of punch
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