139qmb CVT and front end questions By cdoublejj (Read 3,166 times)

[sprocket]

You need a vacuum hose on the air cut-off valve on the right side of the carburator...it is the clear hose in Rich's photo above...

You have too many things going on at once.. perhaps explain one problem at a time?

[cdoublejj]

Well it tends not to start when it's 4th gear. but, since it has a CVT and not gears the CVT was stuck at maximum drive, you see some where in between revving 9500 rpms when the belt suddley snapped and the impact gun i think some of the rollers got tossed around jamming the drive pulley thus lagging the engine down when trying to start and idle.

the scoot seems to be just fine now, one of those plastic things on the roller plate/guide broke, it seems to have no effect. i have noticed the newer and, wider than the worn belt takes some hutspaa out of the scoot untill it gets going, it seems it was running it's fastest just before the belt snapped, due to the old belt being worn thinner, must allow the cvt to shift a bit differently.

[runningslow]

Don't run your scooter with broken guides in the variator.
Learn from my experience:

[sprocket]

If the belt broke you have rollers that have gone sideways..happens all the time...

[cdoublejj]

the guides and guide plate are fine, there are these tiny weeny little plastic things that go in these 3 notches, not really what they are for, 1 broke and it seems to be running just as well as it ever did.

[runningslow]

Oct 18, 2011 16:28:29 GMT -6 cdoublejj said:

the guides and guide plate are fine, there are these tiny weeny little plastic things that go in these 3 notches, not really what they are for, 1 broke and it seems to be running just as well as it ever did.

Those are the bits I'm talking about. They're a bushing that prevents the metal-to-metal contact and allows everything to move smoothly. If one of them is broken and missing, the others will be soon to follow. Once they're all gone, you get that metal to metal contact and carnage soon follows. In my picture, you should be able to see that the guides are broken off and what's left of the stub is bent slightly.

[sprocket]

runningslow right on.. those plastic bits are vital for the variator to operate

[cdoublejj]

guess i have some more items to add to the parts list. is there a particular name for these bits when searching flea bay?

[runningslow]

Variator Slides:
www.partsforscooters.com/164-256-Roller-Weight-Slides?sc=9&category=369
www.partsforscooters.com/164-283_Variator_Slides?sc=9&category=369

[cdoublejj]

i'm gonna assume they work on 49cc too and that the Dr.pulleys are bit higher quality?