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impossible jetting

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2006 CR250. Played with a bunch of different jets. Bike was pinging at wide open throttle, so I went bigger on the main till the pinging went away. Runs good but now the bike splooges out the pipe. Went down 1 size on the main and the pinging is back. Seems to be no answer??? Is there something else I might be missing?

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is the ignition timing set to spec?

great question. I have owned four different 2-strokes over the past 10 years and have never messed with timing. Never needed to. I assume the timing is stock? but I guess I shouldn't assume that. can you point me to a procedure to check timing? Thanks Eddie

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the procedure is in the service manual.the easy thing to check is to see if the timing slot on the stator plate hase been altered. they have a limiter from the factor that doesnt allow the timing to be changed. it can be removed and the timing altered.

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Maybe this not relevant to you but did you buy the bike new? Just asking because if its a used bike then maybe the previous owner installed a high compression piston that requires higher octane gas.

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I replaced the top end. Stock. And yes, the timing slot on the stator looks normal...not altered. Should I put the Mikuni back on? I still have it (stock carb)

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I replaced the top end. Stock. And yes, the timing slot on the stator looks normal...not altered. Should I put the Mikuni back on? I still have it (stock carb)

Forgot to mention I have a Keihin PWK on it instead of the stock mikuni

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could part of my problem be due to the fact that I swapped carbs, so I am not using the TPS sensor since the PWK doesn't have one?

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It was changed when I bought the bike. And from what I hear, the mikuni carb is really finicky, so many people put the keihin on instead

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