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Kawasaki MX & Off-Road Dirt Bikes
KX250 -06 increasing compression
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[QUOTE="Anssi, post: 1085233, member: 23342"] Well, this is turning into a monologue, but here goes. I had an additional .2 mm shaved off the head for a total of .5 mm. The squish clearance is now 1.17mm (this time measured by simultaneously putting two pieces of 2mm solder into the cylinder, one front, one back from the spark plug hole, both gave the same reading). Also, the engine now runs as it should. Very cleanly, and has the bark that it should have. I was able to retard the ignition timing back to stock. There was not a hint of detonation with even the advanced timing, though. Also, the stock jetting seemed a bit rich (all through the head mods and timing changes) so the needle position is now one step leaner than stock but I had to turn the air screw in from 1.5 turns to 3/4 turns to compensate for the change in low throttle openings. (I didn't experiment too much, but 1.5 was lean and 3/4 ok). The Shell V-Power 99 fuel that I'm now using and the bike seem really responsive to changes in jetting. I might put in Boyesen Pro Series reeds but I think that is as far as I will go with engine modifications in the near future. Perhaps a pipe next year. [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
KX250 -06 increasing compression
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