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Post by lshigham on Apr 29, 2011 17:16:55 GMT -5
Have you checked everything in the CVT's functioning normally? (torque driver, etc) I know from experience a sticky TQ driver can shred belts. I'm still bemused by this. I haven't ever managed to break a belt in 10k miles of riding, and I'm only using a $20 standard belt replaced every 3k miles or so  |
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Post by 90GTVert on Apr 29, 2011 17:18:32 GMT -5
Yeah, I take the whole thing apart and grease it every time. A full service every 30 miles or so is about as good as you can hope for, short of a drag race scoot or something.
I know it's getting hot as hell, the CVT cover. That's gotta be slip. It's vented at the clutch and in the bottom front.
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Post by lshigham on Apr 29, 2011 17:29:28 GMT -5
Maybe you've got my back luck now? Here's a theory you may want to try out: I don't know how well known this is, but a CVT relies heavily upon clutch slip to avoid loading up the engine too early, particularly with tuned engines. You can see the slip clear as day on a dyno graph. Something you could try is stronger clutch springs, so that there is still some slippage when you hit the pipe. That way the ''impact'' of the extra torque will be partially absorbed and blunted by the clutch slipping, instead of being sent straight to the rear wheel and causing the belt to slip under the load. If you have problems getting the clutch to slip (you probably won't be able to feel it slipping, I can't) try lightening the shoes - which I know you've experimented with before. This could be utter rubbish, but it's all I can think of  |
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Post by 90GTVert on Apr 29, 2011 17:47:57 GMT -5
Right now, it has the stiffest springs I have and the clutch lightened quite a bit. The bad thing there would be that the more the clutch slips, the more heat in the CVT.
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Post by lshigham on Apr 29, 2011 17:59:10 GMT -5
Right now, it has the stiffest springs I have and the clutch lightened quite a bit. The bad thing there would be that the more the clutch slips, the more heat in the CVT. The difference is that the clutch is designed to slip. You know what happens when the belt slips instead  Probably over your budget, but these are the best clutches I've found: www.scooter-attack.com/shop/#!/en/Clutches/Midrace-High-End/S65016618-Clutch-Stage6-Torque-Control-MKII-107mm.html It'll take anything you can throw at it and is a doddle to setup. Mine's been abused for thousands of miles, and still looks brand new. |
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Post by 90GTVert on Apr 29, 2011 20:00:32 GMT -5
I looked at that in 112mm some time ago. Just not really looking to put over $100 into a clutch. Not looking to put that into anything right this moment.
I gotta wonder what would happen if I actually made it slip some till it hits around 8,500 or so when my scoot only revs to 11,000. I'd be slipping basically the whole ride if I wasn't trying to go over 50 all the time.
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Post by shakerdriver on Apr 29, 2011 20:38:48 GMT -5
I've got one of those S6 clutches on my drag scoot and I love it.
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Post by 190mech on Apr 29, 2011 20:52:45 GMT -5
:stumped: :stumped: :stumped: :stumped: :stumped:
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Post by Reign on Apr 29, 2011 20:55:37 GMT -5
I blame 190mech for making the pipe too perfect :rofl:
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Post by 90GTVert on Apr 29, 2011 21:14:38 GMT -5
Yeah. What a jerk... making my scoot all powerful and stuff.  I went for a ride earlier tonight. I measured the belt before the ride. 1 6.66mm  After 21 miles, 16.59mm  Maybe it was just breaking in? lol The belt wear wasn't bad, but I eased into it when it was hitting from low speeds and never let it stretch it's legs. 60 was my max speed again. Unfortunately, I came home in the back of a truck yet again. This time it started acting up at WOT, then it was a struggle to keep much speed. It finally died at a stop. Not sure what the problem was, never checked it. Was kinda disgusted with the thing so I measured the belt and left it alone otherwise. I did have the GoPro on so I made a quick vid. You can't tell what I'm doing in the vid prob, so 2nd clip is 55-60MPH cruise at about 1/2 throttle. I think that's good for a big dude like me and not even tucking down or anything. Last clips I think you can kinda hear it acting up and finally dying. I just uploaded this, so if you're looking near the post time you might have to wait a few for it to process. |
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jonik
Scoot Member
Posts: 58
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Post by jonik on Apr 30, 2011 3:03:16 GMT -5
Your rpm meter acted just like mine when MVT Millenium ignition broke. Stators built-in pick-up just couldn't handle 13000rpm all the time.
Do you have original ignition? Which CDI do you use? Stock hits the limiter about 10000rpm.
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Post by lshigham on Apr 30, 2011 5:07:48 GMT -5
I looked at that in 112mm some time ago. Just not really looking to put over $100 into a clutch. Not looking to put that into anything right this moment. I gotta wonder what would happen if I actually made it slip some till it hits around 8,500 or so when my scoot only revs to 11,000. I'd be slipping basically the whole ride if I wasn't trying to go over 50 all the time. You'll only notice the slip if it slips after it's grabbed hold properly at say 9k, which is obviously a bad thing. Mine slips for at least 3/4 of the rev range. I'm wondering is this is a case of you taking it just that bit too far for your scooter 's CVT to handle, no matter what you do. I'm sure a Malossi overrange kit would do the trick  |
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Post by 190mech on Apr 30, 2011 6:42:11 GMT -5
Thought/theory;If the vari pulley sheave is filed flat at the bottom,the belt will only ride on its outer edge making the contact area very small and generate lots of heat(preheat),as the hot belt crawls up the pulley and the power rapidly increases,it gets even hotter...Maybe the best way to mod the sheave would be to carefully remove metal at the same angle as the belt side??
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Post by lshigham on Apr 30, 2011 6:54:15 GMT -5
That makes perfect sense John.
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Post by 90GTVert on Apr 30, 2011 7:39:05 GMT -5
That's one of those things I always wanna do, but when I file and file and file, eventually I give up and call it good enough with a blend. lol I need a lathe. Sounds much easier for all this stuff. Real lathe is out of the question for me. Mini-lathes, I just don't know what they'll handle. I could do $500 or so eventually, but that's about it. I'd go for it when I got money together if I knew I could do things like flywheels and variators and such. Never seen one in person, and measurements of the total size don't tell me much since I have no experience with a lathe beyond a wood lathe in shop class many years ago.
jonik : Stock stator, stock CDI, aftermarket coil. It does make me curious now about a limiter though. It has seemed very odd to me that it can hit something like 11,000 on this tach but never moves at all once it's there. I just figured it was a pipe or porting issue since I also thought 10,000 is the limit if a stock CDI is restricted. Maybe the tach is off or it really is a problem? This is the only scooter I've ever had that does not increase RPM in the last 10-15MPH at WOT.
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