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Honda MX & Off-Road Dirt Bikes
1984 CR500 combustion characteristics?
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[QUOTE="EricGorr, post: 157159, member: 19611"] A quick and easy mod to the head would include adding a blend angle between the squishband and the combustion bowl. This serves to reduce the maximum squish velocity (MSV) which is the primary cause of the pre-ignition and detonation problems. Regarding the machine work, find a machinist with a lathe and face-plate, use long bolts and spacer pins to fasten the head to the plate. Set the tool angle to 30 degrees. Start the tool bit 8mm from the outside edge of the squishband and make a cut until it blends into the bowl. David's suggestion of 2 spark plugs is a good one, for best results the plugs have to be positioned from left to right of the bore at 45 degree angles, check to see if theres enough room with the pipe. A good coil to use is one from most Yamaha snowmobiles. Its one coil with 2 leads and is already set-up top work with CDI systems. Good luck:) [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
1984 CR500 combustion characteristics?
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