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YZ426man

what main jet

2 posts in this topic

What does the fmf web site say ?

This is from the site for a 01 426

YZF426

STOCK STK STK STK STK N/A STK

FMF STK STK STK STK N/A STK

Power Core 4/4SA

For 2002 FMF has radically improved the Power Core IV for the YZ owner by making a modular end cap that allows for easy tuning alterations. The Power Core 4 gives the racer the ability to tune their bikes performance via different end caps that form the powerband around the needs of the rider. Quickly changed, the standard end cap (1 ½'), the 1 ¼' for enhanced traction control and a spark arrestor module all give the Power Core 4 substantial versatility besides offering tremendous performance gains. Enhance those gains by adding a FMF header system.

[ June 07, 2002: Message edited by: EgoAhole ]

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