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Post by joedesigns on Jan 1, 2012 14:28:26 GMT -5
Hi, my friend told me about a trick they use in Nascar and thought it might apply to scooters. What they do is they turn their idle down low and drill out a hole in their carb flange by doing this when you take off it is all throttle and some. We noticed on a scooter there are two screws on the flange so by removing one it was like drilling it out. His scooter is stock besides that normally he was hitting 29-30 as top speed this gave him an extra 6-7 mph. I do not know if it will make more or less difference on other scooters but thought I should share this info.
Joe
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Post by mainepeace on Jan 2, 2012 2:01:32 GMT -5
What works in the highly restrictive rules of NASCAR won't necessarily work for a scooter where you are ALLOWED to do anything you want to the carb. Sure you could drill out the butterfly to increase the idle airflow, but the exact same thing would be accomplished by just turning the idle screw up a bit.
You don't want to remove on e of the screws. That would reduce the failure point to a single screw which is offset and *possibly* can work itself loose. You don't want the butterfly coming loose and jamming in the intake plenum when you are running at top speed and then have no engine control. Not that it happens normally, but I've found a few butterfly screws to start loosening up.
If your friend gained 6-7 mph by drilling a hole in the throttle butterfly, his carb is probably too small and is a restriction, or the a/f mix is a bit off. While some people go through the trouble of shaving the butterfly and screw heads, thinning the butterfly spindle and such to get better airflow, it's generally better to just go to a larger carb IF it's truly a restriction.
Greg
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Post by TERRA NUVO on Jan 2, 2012 2:05:56 GMT -5
Greg
great post!
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Post by Pony66 on Jan 2, 2012 9:27:35 GMT -5
Hi, my friend told me about a trick they use in Nascar and thought it might apply to scooters. What they do is they turn their idle down low and drill out a hole in their carb flange by doing this when you take off it is all throttle and some. We noticed on a scooter there are two screws on the flange so by removing one it was like drilling it out. His scooter is stock besides that normally he was hitting 29-30 as top speed this gave him an extra 6-7 mph. I do not know if it will make more or less difference on other scooters but thought I should share this info. Joe Thanks for the info. I read a post about a dawg filing down the screws on the butterfly to be flush. He also filed down the butterfly to be flatter when open. He also ported everything and drilled off metal to lighten stuff. I would be worried about an actuall hole in the butterfly. My carb is operated by vacuum. If I mess with the butterfly, Im not sure the effect on the vacuum and diaphram opening. |
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