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Message: [QUOTE="CarnageZ28, post: 1275193, member: 87235"] The plug definatly makes it sound like it was detonating ... Thats when the air-fuel mixture ignites BEFORE the spark, due to the heat of the compression. And as said earlier, lean jetting or insuficiant octane can cause this. It ignites before the spark, and results in a "explosion" inside the cylinder rather than the controlled burn you get from spark plug ignition. As said earlier, compression test it, and go from there. If it has adequate compression, try catching it in gear? But DEFINATLY will want to check your jetting specs out. You said it has a V-Force reed valve on it right? With a full exhaust. These mods pretty much require rejetting the carbureator. I am betting the bike is running lean cause someone just threw "go-fast" parts at the bike... If it is blown up, rebuild it, and as soon as it is running again, jet it properly ... [/QUOTE]