Anyone put a 138 on their china 125? I wanna know if they're reliable or not and how much of a power increase it is.. I stretch the hell out of some throttle cables in search of more power because im so used to the power of my YZ 250. 
138cc big bore for a china 125cc
yami_racer74
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Anyone put a 138 on their china 125? I wanna know if they're reliable or not and how much of a power increase it is.. I stretch the hell out of some throttle cables in search of more power because im so used to the power of my YZ 250.
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With the 55.5 crank, most of the "138's" end up at 127cc, not exactly screamers. There are alternatives.
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There are quite a few "china 125"
Please determine a few key factors.
This will help narrow it down to what will actually work
1)Front clutch on crank,or rear clutch on tranny main shaft.
2)Stud pattern honda 50 or larger Lifan GPX type
3)69mm or 78mm cylinder.
4)piston wrist pin size 13mm,14mm or 15mm.
5)Spigot hole or case hole inside diameter
6)Can sprocket tooth count 28T or 32T tooth are common
Let us know if we can help.
Please determine a few key factors.
This will help narrow it down to what will actually work
1)Front clutch on crank,or rear clutch on tranny main shaft.
2)Stud pattern honda 50 or larger Lifan GPX type
3)69mm or 78mm cylinder.
4)piston wrist pin size 13mm,14mm or 15mm.
5)Spigot hole or case hole inside diameter
6)Can sprocket tooth count 28T or 32T tooth are common
Let us know if we can help.
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185 Posts
I have a 125cc RSR engine with a 138cc big bore kit.
It is very powerful.
It is very powerful.
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