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2003 RM 250 - no bottom end and fouls plugs

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Im desperate for some guidance. I rebuilt my carb this winter with a stock rebuild kit hoping to remedy the bottom end issue. Now it still runs like crap at low RPM's and fouls plugs. I run Castor oil 44:1The bike has a pro-circuit pipe and shorty. Im ready to take it to the shop but if there is any thing else I could try please share your ideas. Thanks in advance.

BF

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Sounds like you need to do a leak down test: you will probably find it needs crank seals.

Once a motor has been jetted, it should never need to be re-jetted, accept for mods or air pressure changes.

So chasing a jetting problem is a waste of time.

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