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Post by viaqua on Aug 1, 2021 13:30:51 GMT -5
Does the wear on all 3 clutch pads look the same?
I had one that was sticking and one pad was barely worn, ended up replacing the clutch.
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Post by scooter7878 on Aug 1, 2021 17:53:35 GMT -5
I don't think my belt sits all way down either but if u do the marker on the variater face mine rides to a mm to top of variater when I'm full out. I'm not sure how far down it goes in back when in use but I can't squeeze pulley open enough when doing it by hand to get the belt down all the way if my belt traveled any more down rear pulley it would ride too high on front pulley I don't think that's a issue but u need to do the marker test on variator as when I'm use if the belt isn't going down enough in back it won't go up enough in front do the marker test and post a pic of it up close so we can see the wear on the marker
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Post by GrumpyUnk on Aug 2, 2021 8:12:40 GMT -5
Just watched the video. Go to youtube and find the post describing how scooter CVTs work. I think the belt on the variator climbs a bit higher, though cannot tell from the video. That would (does) mean that the belt should go a bit lower in the clutch. It seems the variator and clutch end up at a 1:1 ratio(from appearance in the video), and I had the thought that the ratio would be more (longer/overdrive) compared to a 1:1. Watch youtube for the video 'describing how a scooter cvt works' (NOT the exact title, but that is the content). There may be one on site. Either way, I don't think you have the correct belt(too long, perhaps), though I don't know what machine it is. tom
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vacationer
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Post by vacationer on Aug 5, 2021 20:16:46 GMT -5
viaqua Pads are similar enough that I would need a very precise tool to measure any difference. @grumpyunk Just watched "Scooter CVT transmission explained" and it does look like a higher ratio than 1:1. Belt has the same exact measurements as stock. But if I'm right about that, then yes, it would follow that the clutch is not opening fully. scooter7878 Marks are a little messy since I didn't want to take the variator all the way off, but you can see there that the sharpie rubs off exactly at the point where the ring is building up. I know for a fact that one of those tests was done immediately after sanding down the ring, so it's not just the ring that, once formed, is stopping the belt from moving any further.
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Post by scooter7878 on Aug 5, 2021 23:37:11 GMT -5
viaqua Pads are similar enough that I would need a very precise tool to measure any difference. @grumpyunk Just watched "Scooter CVT transmission explained" and it does look like a higher ratio than 1:1. Belt has the same exact measurements as stock. But if I'm right about that, then yes, it would follow that the clutch is not opening fully. scooter7878 Marks are a little messy since I didn't want to take the variator all the way off, but you can see there that the sharpie rubs off exactly at the point where the ring is building up. I know for a fact that one of those tests was done immediately after sanding down the ring, so it's not just the ring that, once formed, is stopping the belt from moving any further. u need to do that on the variator side
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Post by GrumpyUnk on Aug 6, 2021 7:22:27 GMT -5
That sure looks as if the belt is not riding all the way to the outer limits... Have you checked that the variator can pull close together and that there is NOT a physical limit. Some have a cylinder slid onto the shaft that keeps the two sides of the variator from coming together as much as they could. That will limite belt travel. You can check by removing the belt, and inspecting at the shaft for a blocking slug that prevents full motion. I think you can see on the starter wheel side that there is a change in angle near the outer diameter that reflects the size of the variator, where the angle stops and the side gets 'flat' near the teeth. There are a couple marks in the picture, at the top of the image, that are on the 'flat' I refer to. The belt should ride up to just below those marks. I think. tom
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Post by vacationer on Aug 6, 2021 16:36:58 GMT -5
scooter7878 That's the inside of the front disc of the variator. @grumpyunk No physical limit. I even ran it without the belt just to be sure. The two discs kissed when the engine was running. The new belt seems to have already worn down a little bit, unless it was not as wide as advertised from get-go. Clutch seems to be opening fully since it's getting about as far as I can pull it with my fingers, which feels to be the max that it goes. Possible hypothesis: the new belt wore down while I was still using the old rollers, which were no longer able to close the variator fully due to my having sanded them down. Another hypothesis is that my rollers are the wrong weight - but could that really be the difference between 15mph and 30mph? My guess is that the current ones are no more than 1g too heavy (since I don't know what stock weight was).
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Post by vacationer on Aug 6, 2021 17:26:00 GMT -5
Then again, neither of those hypotheses would explain why the variator is squeezing the belt enough to wear it down.
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Post by vacationer on Aug 6, 2021 18:04:42 GMT -5
Just ran it with the spring removed to see if maybe taking the tension of the rear pulley would allow the variator to open up all the way. I'm not sure if this is even a good test of anything, but maybe one of y'all will find it interesting.
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Post by scooter7878 on Aug 6, 2021 20:00:44 GMT -5
Just ran it with the spring removed to see if maybe taking the tension of the rear pulley would allow the variator to open up all the way. I'm not sure if this is even a good test of anything, but maybe one of y'all will find it interesting. . The mark still needs to be on the inside variater bc it doesn't run all the way up the outside face plate and it's harder to tell exactly how far if u mark the inside pulley the belt should travel within a mm of the top
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Post by vacationer on Aug 7, 2021 12:35:02 GMT -5
Is this what you mean? That ring and the edge of what's left of the sharpie marks are both about 5mm from the top.
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Post by scooter7878 on Aug 7, 2021 15:27:09 GMT -5
Is this what you mean? That ring and the edge of what's left of the sharpie marks are both about 5mm from the top. yes exactly. It should be going up more that 5mm turns into a lot of mph. I'd say that's probably at least 7 or 8 mph on top speed
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Post by scooter7878 on Aug 7, 2021 15:28:36 GMT -5
Is this what you mean? That ring and the edge of what's left of the sharpie marks are both about 5mm from the top. yes exactly. It should be going up more that 5mm turns into a lot of mph. I'd say that's probably at least 7 or 8 mph on top speed . How new is that belt though bc a new belt takes some miles to stretch in a new belt will always be a tad shorter till it stretches after some miles
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Post by vacationer on Aug 7, 2021 15:38:29 GMT -5
Belt is about a week old, but it's done maybe two miles on the road and about 30 minutes total on its stand at various RPMs. Do I need to be running it at high RPMs to stretch it out?
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Post by scooter7878 on Aug 7, 2021 16:54:44 GMT -5
U need to break a belt in similar to a piston ring never full throttle and don't keep one rpm for long time I don't remember the exact miles but I'd say 50 miles would be safe before full throttle. That being said I beat the crap out of mine from the start and have no issues but there is supposed to be a break in period but I find with a new belt my take off is always a tad slower and a few mph off normal top speed for about 100 miles if the bikes drivable I'd put some miles on it checking the belt condition often to be sure it's not burning up and redo the marker test it will probably be a couple mm higher after about 100 miles
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