Clinician
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Joined: May 17, 2015 13:20:52 GMT -6
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Post by borre009 on Feb 8, 2016 11:51:37 GMT -6
Hello everyone body, I'm thinking of installing upgrade of 180cc from 125cc cylinder(and other parts ofcourse), but I'm not sure if I should keep my stock gy6 125cc crankshaft or try to upgrade it to a better one.
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Post by Alleyoop on Feb 8, 2016 12:13:50 GMT -6
You wouldn't need to it depends on how many miles are on it now. If thousands of miles then I would replace it with a new one.
Alleyoop
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Clinician
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Joined: May 17, 2015 13:20:52 GMT -6
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Post by borre009 on Feb 8, 2016 12:20:41 GMT -6
It has done 6k kilometers,so I will replace that. But I did more digging around and found out the parts i was looking at were for a totaly diffrent engine, they were for 139qma/qmb and I have 157qmj. Are the performance parts that diffrent for every engine, or can I just install them to any of those engines mentioned above without a chance of my engine screwing up?
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Post by Alleyoop on Feb 8, 2016 12:29:28 GMT -6
You have to get the parts for your motor, I have a 157QMJ bored out to take a 62mm BBK and I put in a 60mm Stroker Crank for 182cc motor. It all depends on what you want and need, I needed a lot more low end torque to pull my heavy 350lb trike and my 180lb body. I added taller tranny gears to get more top end and with the torquey low end I get there fast. Just remember the longer the crank the less rpms on the top end the shorter the crank the more rpms it will put out.
Alleyoop
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..BAD TO THE BONE..