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Post by Fox on Jun 13, 2010 14:47:34 GMT -5
Are you using the stiffest contra springs you can get?
I'm thinking maybe the extra tension is causing too much friction.
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Post by 90GTVert on Jun 13, 2010 14:51:35 GMT -5
The Venus does have a 2K contra + a Malossi torsion control. I would have thought it would be the opposite... Stiffer spring and more tension would keep the belt from slipping and heating up? Maybe I'm way off, but I think the fact that it always occurs on a straight at top speed would eliminate a lot of things. Running one speed and the RPM not varying should tell me the belt isn't traveling much in either pulley. So if the belt isn't trying to move up or down in a pulley, it would be good that the pulleys had a tight grip on the belt. :stumped:
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Post by Fox on Jun 13, 2010 14:58:48 GMT -5
Well I'm thinking too much squeezing and it'll heat up. Maybe there's such a thing as too much grip on the belt?  I'm just throwing out ideas... |
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Post by Goosey on Jun 13, 2010 18:34:06 GMT -5
Or the belt is riding right off the variator? Throwing ideas...
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Post by 90GTVert on Jun 13, 2010 18:47:35 GMT -5
I doubt it rides off the vari. With it all the way closed the belt sits in between the 2 halves still. It can't close enough to throw it out from what I've seen.
I ordered a Bando belt for both scoots and some replacement slides from scrappy just a few minutes ago.
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Post by Goosey on Jun 13, 2010 18:55:49 GMT -5
LOL, well it's getting difficult to come up with anything, you really were thorough in your tests. Your marks would show how high the belt rode up. Time to take a break, then come back and stare at it later, it'll come to ya. You'll know soon enough if the belts wer wonky. Did you buy them all from different sources? That's kinda a wild card too if you did.
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Post by 90GTVert on Jun 13, 2010 19:00:26 GMT -5
I bought some of the belts I've snapped from different places. Buying the Bando belts from scrappydog, the same place I got the cheap belts.
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Post by Goosey on Jun 13, 2010 19:17:03 GMT -5
I'd try and figure out what the last thing changed when they started snapping,..anything you recently changed on both scooters? or it may be completely coincidence that they both broke. And the problem is just with one scoot. Life is like that.
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Post by 2strokd on Jun 14, 2010 10:51:20 GMT -5
I have a gut feeling you wont have this problem with the Bando,s ;D!
I hope my gut is correct :burnout: ?
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Post by 90GTVert on Jun 16, 2010 19:57:06 GMT -5
I put a Bando on the Venus tonight and took it for a 26 mile ride, about 20 miles being straight WOT. I actually made it home for once! The CVT cover and all parts of the CVT, including the belt, are still getting VERY hot. The belt looks pretty much OK, but you can see that there is some belt dust in the case already. I'm not sure what else to do to cool this thing better, short of making it really ugly or having next to no cover left.  |
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Post by duosport on Jun 16, 2010 20:42:53 GMT -5
well being logical, one could surmise that you have an unusual situation that is repeated in two different scooters, such that the modifications you have done have adversly affected the belts. I offered up that the grinding you did on the sheaves is acting like a grinder on the belts at low speeds. Another thing one could consider is that the multiple opening you have made to cool the housing could be letting in abrassive particles. Lastly is it possible that simply by virtue of moding the engines so much with BBK and all, is overtaxing the belts? I thought it was neccessary to put special heavy duty belts on modded engines.
Anyway, take what I say with a big grain of salt.
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Post by 90GTVert on Jun 16, 2010 21:19:34 GMT -5
I ran my 65MPH Triton on the same belts for thousands of miles, so I don't think the mod/performance level is what's killing the belts. I don't believe it's the venting allowing abrasive debris in causing these issues either. Every scooter I own has vented CVT covers. Some making belts last thousands of miles. The odd part to me is that the CVT covers on my other scoots never got as hot as this that I remember... other than when they were stock with no vents. There are no marks whatsoever on this belt that would indicate any unwanted contact now that I modded my spacer washers fully.
One thing that kinda supports my idea about the heat being too much... It runs like crap after it's ran for a bit. by the time I get to town (10 miles WOT) it's incredibly sluggish. Part of that is the carb being too rich down low (stupid stock carb and lack of pilot jets). It definitely feels like it doesn't wanna downshift though. It bogs and bogs and when it gets to 30MPH or so it finally starts to pull a bit. Then sometimes it rev and take off from a light then slip as it shifts then bog. It's really strange. I might try some parts off of other scoots to see if I can get this to improve and hopefully not break any belts along the way. If I ever get this straight, I still need to get the SunL figured out too.
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Post by Goosey on Jun 16, 2010 23:36:52 GMT -5
What are the covers made of I wonder. You know, like the expensive and prefered metal for a computer tower is aluminum, to stay cooler. Can the engine covers be purchased in differrent metals? Just an odd thought I suppose.
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Post by 90GTVert on Jun 16, 2010 23:41:06 GMT -5
All my covers are aluminum.
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Post by Goosey on Jun 17, 2010 0:24:50 GMT -5
Darn, can't improve on that then. Does the paint hold in heat? Fins on the cover, LOL.
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