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Post by geh3333 on Jun 5, 2015 21:05:53 GMT -5
Many of the 2 stroke 50cc scoots run a 788mm. Is it a jog type engine ? What's the model number ?
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Post by geh3333 on Jun 5, 2015 21:13:54 GMT -5
Many of the 2 stroke 50cc scoots run a 788mm. Is it a jog type engine ? What's the model number ? You said its a 1p39qmb taotao , but a 2 stroke ? Hmmm, I see many 788 size belts for 2 strokes but I'm not 100% certain. |
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Post by onceler on Jun 5, 2015 21:18:40 GMT -5
Oh sorry, I don't know why I said it was a 2 stroke. Its a 4 stroke
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Post by geh3333 on Jun 5, 2015 21:20:17 GMT -5
Oh sorry, I don't know why I said it was a 2 stroke. Its a 4 stroke Ok ,lol . I was a little confused |
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Post by geh3333 on Jun 5, 2015 21:22:01 GMT -5
The 669 is the right size .
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Post by tvnacman on Jun 5, 2015 21:28:43 GMT -5
did you disassemble the clutch, remove the 4 springs repack the bearings?
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Post by geh3333 on Jun 5, 2015 21:34:29 GMT -5
Belt snapping , can only be caused by too much tension or high heat. High heat is out of the question ,so it has to be belt tension. High compression cannot cause belt tension . bad crank bearings cannot cause belt tension , so it has to be in the clutch . Can you jump the scoot from a car and try to start it ? I'm saying it has to be in the clutch because the 2nd belt broke. But was the belt defective ? I don't know. Can't be tranny bearings , because they are not at play at idle. Variator ? I don't think so . Hmmm, its going to take some more time to find the exact issue.
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Post by geh3333 on Jun 5, 2015 21:39:31 GMT -5
did you disassemble the clutch, remove the 4 springs repack the bearings? From what he said , I think he did ? He said the sliding sheeve was loose so I would imagine he at least removed the main spring. I don't think the three clutch springs would be an issue at idle. I'd like to see him jump the scoot from a car and see how it does . not sure if he repacked the bearings. I always do when I remove the clutch. I'd also like to see a video of the CVT when cranking, although it would be hard to see a problem , unless you could hear a strange noise. If the clutch was engaging , the Scot should be jerking. |
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Post by lain on Jun 6, 2015 12:06:01 GMT -5
Take the clutch apart, regrease it, put it back together, make sure the huge assembly nut is fully screwed down. Check rods for any misalignment. Get a kevlar belt if all else fails and abuse it for months till it stretches out of operating specs.
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Post by onceler on Jun 8, 2015 7:59:37 GMT -5
*update* So Saturday I put my new Gates Kevlar belt back on after removing and inspecting the variator again, all seemed fine. I still couldn't get it to light with the electric start, so I kicked it and it started right up. I must've put 50 miles on it on Saturday and it ran great except for having to kick it any time I wanted to start it. The scoot would run at about 35mph @ 7500 rpm. It would exceed this rpm if I kept in the throttle, but I tried not to run it much faster. Everything seemed ok. Sunday, I started it up with a kick again, rode it up the road and noticed the rpm's would run up past 7500 at less than 30 mph. I thought this was a little strange, but maybe it was due to it being kind of windy out. But on my way back from up the road the rpm's maxed out above 8500 rpm for a 1/4 mile at below 25 mph and then...shredded my new kevlar belt I assume because I lost all power to the wheel but the engine was still running fine. I don't know if it actually shredded because I haven't taken the cover off, yet. But I imagine that's what happened  |
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Post by geh3333 on Jun 8, 2015 8:19:43 GMT -5
You def have a CVT issue. It sounds as if the variator is spinning , but the belt is not wanting to spin . the belt was probably ok until it glazed over and the variator began slipping. Id say you have a clutch issue. How are then plastic v-side guides ? It Almost has to be that the clutch is not opening the way it should. How do you put then belts on ? Its hard to shred a real gates Kevlar belt. That thing has to have some tension and has to be getting hot. I'd get it fixed as soon as possible. That much tension on the crank is not good for the bearings.
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Post by onceler on Jun 8, 2015 11:20:13 GMT -5
I just saw a youtube video where a guy changes his belt by squeezing the rear pullery and slipping the belt over the variator. There's no way I can do that on mine. I have to remove the top of the variator,squeeze the rear pulley,place the belt, then re-install the top of the variator. Does this seem normal?
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Post by geh3333 on Jun 8, 2015 14:31:43 GMT -5
I just saw a youtube video where a guy changes his belt by squeezing the rear pullery and slipping the belt over the variator. There's no way I can do that on mine. I have to remove the top of the variator,squeeze the rear pulley,place the belt, then re-install the top of the variator. Does this seem normal? Yes that's normal . I also have to do that. You may be able to get it off if you are able to open the clutch pulley fulley , then hold it there. But it seems much easier just to remove the drive face. You would also have to hold the variator open with something . I bet I can change a belt just as fast with an impact . by the time they get the clutch held open and secured the variator , I'd have the new belt just about on. Now for a road side change , it would come in handy to be able to remove the belt that way. |
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Post by onceler on Jun 8, 2015 14:44:09 GMT -5
ok, thanks geh
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