Post by sailracer on Aug 16, 2013 11:27:19 GMT -5
I have two qmb139 motors
1 that came factory in the scooter
1 that i bought for modding
Heres where i get nervous. The original motor runs so good,37-40 on flat ground, nice mixture, starts in 1 turnover and is dependable. two times now, i have failed in getting the mods just right on the new qmb139. I always left the original alone ( just use the variator & clutch mods). This way, I always have a pristeen motor to put back in the scooter.
The last time I did it, I put the 16/50 gears in and the A9 cam.
I have a 50 mm airsal kit on the way. Since I already have everything else in the original motor, I'm thinking of just lowering the motor, replacing the jug and piston, use the stock head and re-hang the motor. This is far less work than removing and tearing down both motors to swap mods.
I'm just reluctant to mess with the perfect running one as it is my backup, however it would be just changing the cylinder. Am I being too fussy? should I just do it the easier way and save the stock jug and piston?
1 that came factory in the scooter
1 that i bought for modding
Heres where i get nervous. The original motor runs so good,37-40 on flat ground, nice mixture, starts in 1 turnover and is dependable. two times now, i have failed in getting the mods just right on the new qmb139. I always left the original alone ( just use the variator & clutch mods). This way, I always have a pristeen motor to put back in the scooter.
The last time I did it, I put the 16/50 gears in and the A9 cam.
I have a 50 mm airsal kit on the way. Since I already have everything else in the original motor, I'm thinking of just lowering the motor, replacing the jug and piston, use the stock head and re-hang the motor. This is far less work than removing and tearing down both motors to swap mods.
I'm just reluctant to mess with the perfect running one as it is my backup, however it would be just changing the cylinder. Am I being too fussy? should I just do it the easier way and save the stock jug and piston?
jet
