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Post by karsondallas on Jul 18, 2011 21:33:00 GMT -5
i put the 72cc bore kit in my 50cc 139 qmb gy6, the take off is pretty good but my top speed sux, what can i do to help get some more speed, should i change the carb, the cdi, i don't know I'm knew at this, if any one can help me with this prob that be great, thanks
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Post by nitroman666 on Jul 18, 2011 23:01:51 GMT -5
I just did that today. Mine has stock variators in the cvt and stock carb. I have the Blue "Racing CDI" And the orange "performance" coil. Top speed of 50 on flat, 35-40 uphills, and I'm a big ole boy. I'm not sure if the CDI helped me out a lot, but I do know that it does massive wheelies now. for 19 bucks on Ebay, I think it's worth it. Also, make sure the valve lash is proper to ensure compression.
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Post by 90GTVert on Jul 19, 2011 12:44:27 GMT -5
Making sure the carburetor and CVT are in tune are the best starting point. Maybe heavier rollers or sliders in the vari. Unless the stock CDI is restricted, they usually don't do that much.
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Post by Deleted on Jul 19, 2011 22:13:31 GMT -5
My Kymco People S 50 4T with the 72cc, original air box and Malossi Variator i hit the 45 mph on a flat road. :scoot2: |
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Post by rafaelmun on Jul 27, 2011 11:37:31 GMT -5
I just did that today. Mine has stock variators in the cvt and stock carb. I have the Blue "Racing CDI" And the orange "performance" coil. Top speed of 50 on flat, 35-40 uphills, and I'm a big ole boy. I'm not sure if the CDI helped me out a lot, but I do know that it does massive wheelies now. for 19 bucks on Ebay, I think it's worth it. Also, make sure the valve lash is proper to ensure compression. :sos: Help can u tell me where did you buy these items. Thank u. rafaelmun@aol.com |
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Post by reveeen on Jul 27, 2011 14:02:20 GMT -5
"High top speed" requires engine rpm + appropriate gearing.
You will only get so much by increasing your ability to run @ high rpm, then you will be into your final drive poking around, and counting gear teeth. But remember: too tall a final drive without horsepower won't pull it.
There doesn't seem to be any rules (or sense) to what final drive ratio your scooter shipped with. I have spoken to several importers, and got some fairly vague information (meaning: they don't care, or don't know), about what they are selling. I can only guess (and so can you), that if you increase your engine size 20%, what you own should stand a 20% increase in final drive ratio. Of course I am not allowing for increased wind resistance (which increases the faster you go).
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