1986 250r Jetting question

[Buck340]

I'm looking for jetting advice on a 86 250r with 38mm air striker carb, fmf fatty pipe, fmf power power core 2 silencer, cool head, esr reeds and uni air filter in oem airbox. Its current jet set up, which I don't know off hand, isn't allowing the bike to hit the powerband. The throttle flattens out. Please help! Thanks!!

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[Red Rider]

I'm assuming you have a high compression dome in your cool head? If so, you'll most likely need to tighten up your sparkplug gap a tad over the stock setting, due to the higher compression from the cool head. Try setting the gap @ .018"

[yaegerb]

I would need to know your current jet sizes and needle clip position to make a reasonable attempt. Also need to know the current temperature.

[Buck340]

It has a 22cc dome. Current temperature is 40-50f in ny area. I'm starting from scratch so what jets should I start with and I will put the needle clip where you suggest.

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[yaegerb]

Try 50 pilot, 168 main, needle clip 3rd from top. Air screw 1.5 turns out from seated.

[Buck340]

Thank you!! I will let you know how it goes tomorrow. [emoji3][emoji3]

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[Buck340]

Thanks guys the bike started right up and sounds awesome!!! But I can still use a little help. If I roll into the throttle it pulls like crazy all the way to redline but if I'm cruising along and snap the throttle it breaks up. What is my next step?

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[yaegerb]

Raise your needle clip to second from top and see if it runs more crisp.

[shortline10]

Did you try closing your spark plug gap like previously suggested ?



Thanks guys the bike started right up and sounds awesome!!! But I can still use a little help. If I roll into the throttle it pulls like crazy all the way to redline but if I'm cruising along and snap the throttle it breaks up. What is my next step?

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