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Post by twinpower on Sept 10, 2013 21:40:40 GMT -5
could be a cam bearing failure... I had that happen on my 50 cc and it was still under warranty. I had got it fixed and all I had to pay was the labor fee
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Post by twinpower on Aug 29, 2013 22:24:26 GMT -5
I think your carb may not supplying enough fuel.. the carbs fuel bowl is probably running low when ur at wot and can't keep up with the engine fuel demand. I'm having the same problem with my 50 cc with a big bore kit. when I get to the end of the street from wot and wants to die but once I putt around the carburetor bowl fills back up.. i need a carb with a deeper fuel bowl  |
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Main Jet?
by: twinpower - Aug 28, 2013 15:44:18 GMT -5
Post by twinpower on Aug 28, 2013 15:44:18 GMT -5
I up jetted to a  when mind was completely stock. |
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BBK Quest
by: twinpower - Aug 28, 2013 15:39:09 GMT -5
Post by twinpower on Aug 28, 2013 15:39:09 GMT -5
All of the 2 stroke scooters I know are oil injection.. but it is possible to run straight mix if you remove the oil injection ;D
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Post by twinpower on Jun 9, 2013 11:50:30 GMT -5
I plan on going all out on my scoot with performance parts soon.. if the money ever becomes available  |
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1p39qmb
by: twinpower - Jun 9, 2013 11:38:07 GMT -5
Post by twinpower on Jun 9, 2013 11:38:07 GMT -5
1p39qmb/ 139qmb is basically the same thing. It is also known as 49/50cc gy6. you should be able to get oem and performance parts for it
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Post by twinpower on Jun 9, 2013 11:09:06 GMT -5
I kwn the biggest bbk out is a 88cc /52mm.. with a 44mm stroker crank and Big Valve head. with a properly tuned cvt and a gear up kit..you can probably get that bad boy up to 60mph. ;D that is my plans for my scooter in the next few months  |
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Post by twinpower on Jun 8, 2013 12:44:25 GMT -5
Would a 139QMB benefit from a oil cooler if the engine is fully modded out that's running at a sustained speed? and also can the oil pump push the extra volume of oil through the passages in the cooler?  |
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Post by twinpower on Apr 12, 2013 11:05:03 GMT -5
Something is shorting out somewhere when it is getting wet From the rain.. It could be the switchs on the handlebars or maybe a Wire connector or both
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Post by twinpower on Apr 12, 2013 9:55:39 GMT -5
[replyingto=marshalldillion]marshalldillion[/replyingto]I was expecting more than 5-6hp. Owell  |
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Post by twinpower on Apr 11, 2013 17:08:25 GMT -5
I know for sure a bone stock 139qmb has top speed of about 35 to 38mph, and is rated at about 3-3.5hp @ 7-7500rpm at the crank I believe ( correct me if I'm wrong). But what about a fully modded one? For example: 52mm bbk, stroker crank, big valve head, A9 performance cam, race exhaust etc. And a top speed of about 60mph. Any inputs or if anyone has a idea, any info would be appreciated! |
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when mind was completely stock.