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Post by tortoise on Jul 2, 2016 15:31:21 GMT -5
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Post by tortoise on Jul 2, 2016 13:21:39 GMT -5
For what specific engine and task?
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Post by tortoise on Jul 2, 2016 10:47:28 GMT -5
Roketa distributes many WMI's. The 139QMB engine is relatively "generic".
What specific issue are you seeking to resolve? |
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Post by tortoise on Jun 27, 2016 11:03:38 GMT -5
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Post by tortoise on Jun 26, 2016 14:10:54 GMT -5
The compromise would be loosing the enhanced utility of a flat floorboard.
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Post by tortoise on Jun 26, 2016 10:56:55 GMT -5
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Post by tortoise on Jun 25, 2016 13:16:38 GMT -5
The rear carrier design is somewhat puzzling . . appears as though a trunk or basket mounted against the bar would obstruct gas refilling?
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Post by tortoise on Jun 25, 2016 11:43:20 GMT -5
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Post by tortoise on Jun 22, 2016 23:23:49 GMT -5
Be sure to only use 6-point sockets on variator and clutch bell nuts (pull rear brake lever).
"You can also lock the engine by putting a length of cotton rope down the spark plug hole, with the valves closed and the piston coming up on the compression stroke. Any small bits of cotton left in the engine will burn up and not hurt any thing" . . source
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Post by tortoise on Jun 21, 2016 13:01:00 GMT -5
50cc or 150cc engine? Clear title? Asking price?
A 150cc Znen completed a cross-country.
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Post by tortoise on Jun 21, 2016 11:49:24 GMT -5
If "My petcock" is on a typical China scooter . . M16x1.00 appears to be the standard size . . but Scrappy also shows a M14X1.0 size. |
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Post by tortoise on Jun 20, 2016 19:21:42 GMT -5
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Post by tortoise on Jun 20, 2016 11:14:20 GMT -5
You already know the answer . . probably unrealistic without increased displacement, and a BBK needs to be compatible with either 64 or 69mm valve length. Since the belt pulley ratio remains the same, a higher top speed requires running the engine at high rpm's, or a rear gearbox ratio change.
139QMB engine performance modifications down-grade longevity by enhancing the odds of bearing failure.
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Post by tortoise on Jun 19, 2016 17:18:00 GMT -5
Save yourself a lot of aggravation and replace the 50 with another 150 scooter!
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Post by tortoise on Jun 19, 2016 15:58:10 GMT -5
If you are already knowledgeable about GY6 engine performance enhancements . . unclear what information you are seeking??
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