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Message: [QUOTE="The Redrider, post: 1472802, member: 143520"] Kehin PJ carbs is what I have on my 85-89 cr-250's. I had some issues with bogging and sputtering. I went down 1 step lean on my pilot jet, and 1 step down lean on my main jet. I notice the ethynol in the fuel they sell makes all bikes bad. I heard that the ethynol could eat up rubber seals in engines and make them run really bad. Ex. crank seals, float valve needles, etc. You might try to find some ethynol free gas, or try some VP racing gas just for grins. I know back in the 80's I never experienced the troubles I have today with bad running. I think Autozone sells ethynol remover to add to gas. Good luck! [/QUOTE]