January 15, 201214 yr Is anyone else having detonation issues? I bought the bike in summer 315r 2003, i noticed it was detonating so i switched fuel to 97 ron bt ultimate which cured it...until now it came back im thinking i might need to run an octain booster!!??
January 15, 201214 yr it needs a right good de-coke. barrel off, head off, piston off , rings off, the lot. once done, no detonation.
January 15, 201214 yr I would run pro boost as well if you run it on the road. All Monts will pink a bit.
January 15, 201214 yr Author it needs a right good de-coke. barrel off, head off, piston off , rings off, the lot. once done, no detonation. I can understand if the piston crown has a build-up of carbon it will lower the compression causing it to pink but why the head and rings out? compression was tested a month ago and was stock! surly its just an octane issue!
January 15, 201214 yr I can understand if the piston crown has a build-up of carbon it will lower the compression causing it to pink but why the head and rings out? compression was tested a month ago and was stock! surly its just an octane issue! if you doing half the job anyway why not do it all? pre-detonation can be caused by several combinations of issues, one being small particals of carbon on the piston igniting the mixture before the spark. When you switched to a higher octane fuel the engine ran cooler, but the carbon still built up, hence the problem has returned.
January 16, 201214 yr Author if you doing half the job anyway why not do it all? pre-detonation can be caused by several combinations of issues, one being small particals of carbon on the piston igniting the mixture before the spark. When you switched to a higher octane fuel the engine ran cooler, but the carbon still built up, hence the problem has returned. i usually remove the plug inject some carbon-x leave a few hours move the piston down the cylinder then blow it stright through the exhaust port its worked a treat on my exc!
January 17, 201214 yr Carbon buildup on the piston and/or on the head will raise compression ratio, not lower it. Plus, carbon has a tendency to glow. Those two factors can be contributing to your detonation problem. But another issue is the temperature, which affects jetting requirements. If you are running with the same jetting you had in the summer, then it might be too lean for cold temperatures. Also, gasoline blends which you buy at the pump are seasonal, i.e. the oil companies blend them differently based on the season. The only way to have consistent fuel is to buy expensive race fuel in canisters.
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