VIDEO of variator rattle By twowheeler (Read 650 times)

[twowheeler]

Is this normal?

I noticed that my new variator has a bit of play when all buttoned up. Theres a bit of movement back and forth but the rear plate of the variator appears to be flush in the back and not moving. only thr front plate has movement....Normal? The boss inserts to the rear variator plate, then the front pulley and washer then nut.

Seems to rattle a tad more when i blip the throttle at idle for a second than my other stock setup. I did note that the new rear face is about an eighth inch shorter than stock if i lay them flat side by side. I thinks its allowing the belt to lay exactly on the boss allowing the best initial gearing? Or are performance variator weight larger than stock? Maybe to keep them from rattling in the different angled ramps? I dont have anything to measure them accurately to tell.

[Bashan]

That is NOT normal. As you're probably aware, the shaft that the variator attaches to is the crankshaft. You'll can get a slight "play" feel due to the connecting rod. However, what you're getting is way beyond normal tolerances. That sounds to me like the outer pulley is not tight on the splines. You did remember the washer didn't you? There's already one of two people in this conversation that has forgotten the washer. We've had a few guys on the forum that bought variators and the outer pulley opening was too large. Maybe something like that happened to you . Whatever is rattling in your video shouldn't be rattling. The belt can lay on the boss, a new belt sometimes won't quite reach it; that's not your problem. I'm not sure what you mean when you say the inner pulley is an 1/8" shorter. Do you mean top to bottom or from engine side to outer pulley? Compare all of the openings from the old to new unit and also the spline patterns. I wouldn't ride it like that. That slack will eat up metal parts. If you toast the crank splines you can imagine what that's like.

[twowheeler]

Everything is tight as best I can tell. Since there's room on the boss I know the face plate is on tight and not pushed against the belt. It's a. It shorter if I lay them flat on the table.

[Alleyoop]

Question what your moving is actually the Variator itself , Did you forget to put in the PLASTIC guides on the Variator PLATE?
It is making metal noise when you move it so I suspect the Plastic Guides are missing.
Alleyoop

[twowheeler]

The plastic guides are in. What i think we are hearing is the play between the guides and the noise of the weights since the belt is not quite touching the face since its a tad shorter in height (not diameter) when laid down flat next to the stock variator. The rear plate is flush againts the bearing and doesnt move. The boss and front geared face are tight as well and dont move. Maybe the new guides have too much room in between. I could try the stock guides.

When its oriented in this position it is shorter. Disregard the micrometer! You'd be surprised how hard it was to find a pic of a variator side!

[twowheeler]

So I did some checking. The stock boss and back plate look identical to the performance parts. I did see that the performance slides seemed larger and had more play than the stock guides so i swapped them out for the stock. I see that the back oif the variator does not sit ecaclty into the rear of the case because there is a raised area on the shaft thats about an inch long so thats where it rests. I suppose if i had to I could put a washer behind the variator to take up that tiny bit of slack....The rattle has been cut by 75% with the guides swapped out but the belt still does not touch the variator at rest. The ad was a variator for 50cc QMB139. Is it possible it was mislabeled since it is not as thick as the stock variator? Should i shop for one that is the same thickness and touches the belt?

AHHA!!! If i put in rollers in place of sliders the slack goes away! So it appears that the sliders are doing what they are advertised to do...sit lower in the variator.

[Alleyoop]

That circle you have on the crank that is what the Variator plate is supposed to tighten up against. As far as the belt not touching sitting there did you by chance change the belt and got the wrong size? What size belt is on there.
Alleyoop

[twowheeler]

Stock belt with 900 miles on it

Bando_723_17.5_28

[Alleyoop]

Hummm, are the Sliders the same size as the rollers? I would measure the Sliders they may have sent you one size to small.
Alleyoop

[twowheeler]

Both are 16x13 and it came with rollers. The sliders i had. When I saw this graphic it does appear that rollers of equal size does show the variator a bit further out with the roller.