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Dirt Bike Brands - Other
deceleration knock with 2 strokes
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[QUOTE="Rich Rohrich, post: 1234616, member: 16241"] If it is a re-fire in the pipe and not combustion knock, then you have to look in a different direction then the things that were discussed earlier. A couple of things to look at : - speed of combustion - If unburned fuel is being dumped into the pipe a re-fire is possible. This will be related to ignition timing, squish efficiency, mixture strength (rich and lean both burn slow), fuel quality (especially the 90% and end point temps of the fuel) as well as the the efficiency of the scavenging loop. Fuel can be short circuited into the exhaust from a port mismatch or some other manufacturing flaw. Porting is the only way to fix this. Speeding up the combustion by correcting the squish clearance is an excellent way to fix this, and probably the simplest. Unless you want to deal with race fuel, fuel quality is a hit or miss proposition. It sounds like you are on the right track towards fixing it. [/QUOTE]
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Dirt Bike Brands - Other
deceleration knock with 2 strokes
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