marcusgunby
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- Jan 9, 2000
- 6,450
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- #26
01 Honda Cr has it right.
Originally posted by EricGorr
The 2000 RM125 piston is 1.5mm shorter on the timing height. This piston will advance the port timing and increase the duration of the transfer and exhaust phases. The ring centering pins on both pistons are directly on center with the rear boost port. That enables the rear transfer ports to be widened even further for more overrev... RM Piston, Stock Exhaust
Turndown the gasket surface 1.25mm up to the squishband so the entire 54mm of combustion chamber protrudes past the gasket surface. The RM piston has a shorter timing height and this mod will compensate for the distance between the piston and head.