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Post by camojeremy on Sept 13, 2013 14:13:14 GMT -5
Ok so I'm going to do a BBK was going to do 50mm but people have said scooters don't last long after putting one on... so was going to 47mm if this is false would a 52mm be pushing it...
Opinions?
when doing BBK is a new Stroker Crank necessary or will the old one do? how big of a kit can I go without busting the old one?
Opinions?
Whats the best gear ratio for these kits i was thinking 50/16T (3.125) Good, Bad, Better one?
Opinions?
Performance A9 Camshaft Worth the money?
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Post by PCBGY6 on Sept 13, 2013 14:24:37 GMT -5
A lot of people are running the 50mm kits and have no issues as long as you keep it tuned right. The 50/16 gears are also the popular choice for scooters after installing the bbk.
When you hear people complaining about blowing a motor after install its more then likely the installers fault and not the parts. Like a said the proper tuning and everything 99% should be ok.
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Post by camojeremy on Sept 13, 2013 15:21:14 GMT -5
Great But. . . Not entirely Mechanically inclined. . . I do so work myself but probably will not be doing the BBK it's a little above me so in "keeping it tuned right" What exactly does that entail?
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Post by jimboeau on Sept 13, 2013 15:26:22 GMT -5
Great But. . . Not entirely Mechanically inclined. . . I do so work myself but probably will not be doing the BBK it's a little above me so in "keeping it tuned right" What exactly does that entail? Making sure you upjet your carb so that you are not running lean with the larger displacement. |
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Post by sailracer on Sept 13, 2013 18:11:49 GMT -5
I would advise you to get an airsal 50mm kit.They are excellent quality, engineered to use with a stock head and carb ,come with gaskets and a set of instructions too in case you need the help. I tried two different bbks before the airsal. I am thrilled with it.I also run 16/50 gears. mods are in my signature  Don't forget to upgrade your tires and brakes.(thatwas my first mod!) |
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Post by PCBGY6 on Sept 13, 2013 21:02:04 GMT -5
Inhabe never replaced the piston on any before i put the bbk on my scooter. Took a little over two hours and I'm extremely happy when the power difference. A lot of guys here never worked on engines before that got a scooter. This board has enough people to talk anyone threw a build. A ton of knowledge here and a lot of threads that can be accessed. Also a lot of good how to videos on YouTube. If you can follow instructions you can build a motor.
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Post by skuttadawg on Sept 13, 2013 22:21:56 GMT -5
I have had over 40 mopeds to motorcycles in my time and broke down and bought a TaoTao ATma 3 years ago since I had two wheel fever , limited budget , only wanted a new one , and was sick of spending over 80 a week in gas . Well it cracked the piston on day two and 6 weeks later the new piston exploded . So I knew I had to do some research to get up to date as I was used to Honda and Suzuki instead of the China stuff . Well I joined the old SD and was suggested the 50mm Air Sal kit by a member since no way did I want another " secret 63 " since two had failed on me in such a short time . I have never ever had a piston problem in any of my other toys . I took my scooter back to the shop and told him I wanted another piston kit and told him I was suggested to try the Air Sal . Well the scooter gods were smiling upon me as he just had got in two kits . I asked to inspect it before buying . Right away you can tell the much better material and craftmanship compared to China stuff . It is ceramic coated to protect from heat damage and the cylinder is aluminum . This kit is designed to reuse the stock 40m head but you can opt to get a 50mm head as well . First off it was a huge increase in power compared to the 63 cc . I already went from 8g to 5g rollers since it is hilly here and used a  main jet the rest was stock . Riding it around the block since I do an easy break in on the begging and get on more in the midrange after 100 miles . Well I had just got 50 miles on it when a guy on Peace 150 tapped me on the shoulder while waiting at a redlight . He said when the light turned green he would show me what a REAL scooter would do . I accepted his challenge . I used my feet to push off to help the holeshot and I outran him to the next redlight 1/4 mile away . I told him I did not see anything can he try again . He got mad and rode off . I bought my Echarm and decided to sell my lil hot rod to a guy who had just blown up his scooter and needed one ASAP . He was so impressed from the test ride he had the cash in hand before he came to a stop . I ran into him a few months ago and only changed the oil and replaced the belt and it still runs strong . Here is link to get the Air Sal at the lowest price www.spi-parts.com/gy6-airsal-81cc-big-bore-cylinder-kit-02350150.html You may opt for the ported head with larger valves and a 24mm carb like MillSC had on lil monster here www.scrappydogscooters.com/139QMB_50cc_Performance.htmlI would use a secondary base gasket since compression will be so much with the stock head . Larry built a 8x cc with stroker crank and said it ate up variators with the additional torque from the longer stroke of a stroker crank |
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