Mainshaft Lifan 125, 140 and 150. ZongShen 140 -start on any gear-

Lifan 125 type 1P52FMI (the true one that permit to start on any gear)
Lifan 138 type 1P54FMI (since june 2009)
Lifan 140 type 1P55FMJ (since june 2009)
Lifan 150 type 1P56FMJ and HS1P56YMJ
Loncin 156FMI
Jialing 125 type 1P56FMI
ZhongShen 140 1P62YMJ ATTENTION the 2nd gear don't have the same ration that mean you need to use with the countershaft reference 2
36
 if you want to fit into this engine
Gearbox 1N234 and N1234
One side diameter 12 and the other 17mm + 14mm thread
Total length = 155mm