Quote:
Originally Posted by Bibio
i'll say blocked primary jets in the crabs. once the choke is off then the primary jet takes over as far as i can remember.
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Agreed. My dad has a rarely used curvy and it suffers from this problem almost every time it's dragged out. An old trick that can sometimes provide a quick fix is to remove the airbox, start it up and rev the engine and then stick your hand (or some other flat object) over the end of the carb for a few seconds. The sudden high vacuum helps to drag any blockages out of the jets, though it will splutter a bit as it will run very rich whilst you are blocking the carb.
Obviously repeat this on both carbs in the case of the SV. Don't try this using your hand on large capacity engines either...