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421 cub having trouble launching


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Has this motor ever ran good? What is different between now and when it ran good (besides elevation.)? 

 

It must be because it doesn't have Sniper Inframes on it....................

Only had a few rides on it and always had issues out of the hole. Runs like a champ up top.
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Sell those Miks and get some Lectrons or PWKs. Or at least borrow some to try. No reason the Mikunis won't work but if someone can't get you close it's gonna be a headache. What size dumps in those? Sure they aren't drilled out for alky? Pumpers? Do they have an actual overflow on them?

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