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Post by lain on Aug 14, 2015 9:21:02 GMT -5
So recently my top speed has been going down by a couple mph every couple days or so, then yesterday I heard some weird noises like a feild mouse had got into my cvt case and was having a party in there. I opened it up and what I see is the variator had come apart somehow, like the bushing that is in the middle of the variator somehow came out and was forcing the variator to stay open slightly. I already replaced it with a spare I had on hand, went from having a top of about 35 to back to going 50+ but just look at this weird variator issue, what do you guy think could cause this?   |
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Post by pmatulew on Aug 14, 2015 17:12:28 GMT -5
Defective? Worn out maybe?
My bushing and variator got so badly worn that that it just rattles around inside the hole. I thought the motor was sounding like it was ready to throw a rod until I pulled the variator off and the noise magically stopped.
My new variator kit just arrived today direct from Taiwan. Been out of commission for over a week. Hoping to be back on the road this weekend.
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Post by tvnacman on Aug 14, 2015 17:19:24 GMT -5
I don't see the damage in the pictures.
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Post by lain on Aug 14, 2015 17:42:25 GMT -5
I don't see the damage in the pictures. It's hard to see it in the second pic, but in the first pic you can see the top of the bushing that comes pressed in the variator when you get it (not the big one that slides into the variator) is sticking out. If you look at a regular one they are not sticking out. In the second pic if you look closely you can see where the other end of the bushing has created a ledge inside the variator. |
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Post by tvnacman on Aug 14, 2015 18:37:19 GMT -5
I'll pull a variator a little later, that looks like a 150cc. Is that correct?
John
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Post by lain on Aug 14, 2015 18:52:41 GMT -5
I'll pull a variator a little later, that looks like a 150cc. Is that correct? John It's a 50cc variator from a 139qmb engine. It is stamped inside with HZMZ, or maybe it's actually ZWZH, they both look like they could be right. |
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Post by tvnacman on Aug 14, 2015 20:51:04 GMT -5
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Post by lain on Aug 14, 2015 21:50:07 GMT -5
See how on yours the bushing in the middle of the variator goes all the way in and is not protruding out the inner side of the variator? The issue with my variator was the bushing came out and I could not get it back in even with a rubber mallet and a can of wd40. |
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Post by rockynv on Aug 15, 2015 0:41:58 GMT -5
The bushing is oilite (sintered bronze with oil embedded in it) and can shift when the variator heats up especially if you cleaned it with a solvent removing the oil inside it. You would need a hydraulic press to get it back in place however it would most likely just shift again.
How were the plastic guides on the ramp plate? Any signs that they lost engagement allowing the variator to spin on the boss?
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Post by lain on Aug 15, 2015 1:50:47 GMT -5
The bushing is oilite (sintered bronze with oil embedded in it) and can shift when the variator heats up especially if you cleaned it with a solvent removing the oil inside it. You would need a hydraulic press to get it back in place however it would most likely just shift again. How were the plastic guides on the ramp plate? Any signs that they lost engagement allowing the variator to spin on the boss? The plastic guides were actually okay when I opened it up and are currently being used again as I did not have spares. I had a bando belt in there, it has rubbing marks and the threads started coming out the sides, so I replaced with a MMG kevlar belt. All the weights had become severely worn down every single one was worn to the middle almost, so I replaced them with a set of 7g weights I barely used. |
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Post by rockynv on Aug 15, 2015 7:19:09 GMT -5
It is possible than that the heat from the belt heated the drive face on the variator so quickly that it expanded when the bushing was still cold allowing it to slip. The Bando belt scored up the drive faces on my Lance pretty badly too however once I went to genuine Gates Premium belts that stopped.
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Post by lain on Aug 15, 2015 8:27:48 GMT -5
For that to be there would have had to be heat, but I check the temp of the CVT case after every ride practically and it was never hot, just warm, so I believe the chances that heat caused the issue is low, however I do not know what caused the issue and am still pondering the different things that may have caused it but can't come up with anything. My guess is it was a crappy variator that took a crap in my cvt.
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Post by scooter on Aug 15, 2015 11:20:33 GMT -5
I just took a variator off of a scooter that was trashed after only 500 miles. The slide bushing was completely worn out and the brand new rollers had flat spots. Just pathetic.
I put his old one back for now, that has 7,000 miles on it and still looks pretty good. I need to find a quality seller that actually has good parts when I need them and at prices that let me make a little money too.
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Post by cyborg on Aug 16, 2015 10:14:22 GMT -5
Maybe the bushing was out if tolerance when it was pressed together at the factory and was " loose" till the right conditions occurred,,, there are a lot of side loads on that plate after all
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Post by lain on Aug 16, 2015 10:34:12 GMT -5
I am going to check the parts I installed for replacements after the variator issue occured so I can confirm the issue came from the variator. I know by riding it it is a whole lot better, I have gained more than 10mph topend, and with lighter weights too. So obviously the replacement parts are working but just to b sure I will check it anyways.
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