Maintenance & Technical > KX450F / KX250F

For you "Dollar Stroke" guys!

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kxpegger:
Had my RMZ450 head done by Pro1RacingHeads out of Phoenix. Machines his own non-beryllium valve seats out of Mold Star 90 stock and valve guides from a nickle-bronze alloy. He doesn't cut the valve seat but uses a Haas machine to profile them. He does porting and verifies his work with a flow bench.

Haven't noticed much change on the bottom end but did not loose anything. Head starts to shine mid-range and above!

http://pro1racingheads.com/Pro1RacingHeads/Home.html

http://www.youtube.com/watch?v=ewXFSI21v2g

http://www.youtube.com/watch?v=4XC_2AD5rD0

http://www.youtube.com/watch?v=bvtV1c8w06U

http://www.youtube.com/watch?v=Z3JCioHMcIw

ZETTNORCAL:
Well.............How much did it cost?

kxpegger:

--- Quote from: ZETTNORCAL on April 26, 2011, 03:34:02 PM ---Well.............How much did it cost?

--- End quote ---
Machine work and porting $600.00. I had to supply the new OEM valves, seals, springs, seats, and keepers! Cheap? Not even! I can honestly say I'm done with 4 strokes! Also replaced the piston, rings and cylinder after 350+ hours. $2000.00 plus total... should have just bought a whole new machine!

Motorrad:
Four Stroke stands for

F that...

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