ORIGINAL: dave_anderson
Just kinda lookin around this SPA arena. I've always been interested in 70's pattern. Are most guys using the pumped, or non-pumped OS 91FS? I noticed in the MA article pumps were "legal"
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Pumps are legal, just not oversized carbs. If the carb comes with the engine, it is not oversize.
They are against supercharging, so all YS four-strokes are not legal. A good move as far as I'm concerned. Otherwise, it turns into another wallet competition.
I've never owned/operated an OS four-stroke with a pump. With that said, it is just another thing to break or cause problems. Now, if it was a geared pump, such as those used by Enya, I'd be all for trying one. But Enya's .91 four-stroke is really heavy, so I hear.