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Not to be contrary but the lack of any filters would make the "air box" volume infinity large, not small. I also don't believe in a shared intake or exhaust with a four stroke with a 180 crank, power-power-exhaust-exhaust. One cylinder inevitably helps the other's performance while the other cylinder hurts the first's. It doesn't seem to be a lack of an accelerator pump issue since even when rolling on the throttle it stumbles at the same slide height. The needles just need shimmed or changed for ones with a different taper. No big deal, all the same stuff I had to do for the 250 engine. Thanks though. I'll post some dyno results in a couple weeks.
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