If you buy this kit, it will take a little work, just like most kits. In this case, youre going to want to space the cylinder up until the piston clears the exhaust floor at BDC. You dont want the ring exposed to that heat. Once this happens, your squish is now too thick. Your bottom end torque will suffer, your cylinder will struggle to scavenge and push the charge towards the center/spark plug and you wont have the performance you desire. In extreme cases it could cause detonation. Besides matching this kit with a head that has proper squish, youre going to want to mill some off the top of the cylinder to offset what you raised up by spacing the cylinder away from the cases. Like I said, you should be making these adjustments to almost any kit you are installing, for the best performance. Sometimes its just a thick base gasket, sometimes its a spacer and 2 gaskets. Bust out that micrometer and get to work.
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June 18, 2012
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cat teets from Albany, NY United States
This must be some kind of stock drop in replacement kit.
I put it on a stock av10 case with a full cheek crank and had to raise the base up about 0.4mm to keep the piston from slamming into the doppler head. Then more fine adjustment to account for squish... The piston doesn't clear exhaust at bdc by maybe 1.5mm after base gasket adjustments.
Otherwise the materials and finish are very high quality, just the actual design is shitty. The goal of this engine for me is to make a reliable and quiet daily driver / rally loaner, it should accomplish that.