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Posts: 33
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Joined: May 28, 2013 9:09:50 GMT -5
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Post by carpespasm on Jun 1, 2013 13:38:37 GMT -5
Hi all, Not sure if WTB posts are okay in here but I didn't see anywhere more suiting  . I'm in need of a cylinder kit for my qmb139 50cc and while I'm seeing some sites selling the full kit for about $50 I was curious if anyone had a set they're willing to part with for less that's in serviceable shape. Anyone got a good scooter that's bottom-end grenades? Thanks! |
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Post by lykos23 on Jun 1, 2013 13:45:55 GMT -5
[replyingto=carpespasm]carpespasm[/replyingto]I just ordered a bbk for my secret 60. If you can wait week or two for me to install my bbk you can have my leftover parts, which would include a 44mm piston, a 44mm cylinder, rings, and maybe a head. It has about 2300 china miles on it but I've never had a single problem with it.
It would essentially be the smallest bbk you can get by upping the ccs by about 14. I can get about 40mph out of the thing.
I could understand if you don't want used though.
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Post by millsc on Jun 1, 2013 14:21:41 GMT -5
I have several 50cc's top ends
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New Rider
Currently Offline
Posts: 33
Likes: 2
Joined: May 28, 2013 9:09:50 GMT -5
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Post by carpespasm on Jun 2, 2013 22:52:52 GMT -5
Thanks millsc!
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Post by skuttadawg on Jun 3, 2013 0:27:41 GMT -5
Since you have to rebuild why not get a BBK ( larger than 49cc engine kit ) since it will have more power to go up hill and last longer than a 49cc as the extra power it does not have to work as hard and can be tuned along with CVT mods to go faster . I had a TaoTao with a secret 63cc that cracked the piston and the 2nd engine blew up 6 weeks later . I had a mental meltdown as I have had 30 to 40 two wheelers and never once had any piston or engine failure , and I rode them like I stole em as any teen would . When the 2nd engine blew up I joined another scooter site ( my first ) in order to get up to speed on the China scooters as I was used to Japan and European quality and the China scooters are nothing close in quality . Well I was suggested an Air Sal 50mm or 82cc BBK that is made in Spain rather than China and has ceramic coatings on the piston and inside of cylinder to reduce heat damage like cracking , plus it has an aluminum cylinder instead of iron and uses the stock 40mm or 49cc head . I think you could use a 50 MM head which would have larger valves with more flow and less compression as many use 2 base gaskets since the compression can be high with the small head and also increase clearances . I went to my scooter dealer since it had a 6 month warranty and no way did I want another PO junk recycled pot metal and butter piston kit again , and I mentioned the Air Sal kit I was suggested . Well the scooter gods were smiling on me as he just had got in 2 kits . He sold it to me for his price of 78 according to the invoice which is a deal as I saw it listed for 149 . You can thank MillSC for sharing this link with the kit priced super low www.spi-parts.com/airsal-70cc-cylinder-kit-02350150.html Some have 64 valves other use 69 so measure first |
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