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May 21, 2013, 4:17am

ScootDawg Scooter Forum :: The Garage :: 125cc Scooters and up.... :: Drive belt continually breaking

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Topic: Drive belt continually breaking (Read 1,329 times)

sunnydaze
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Drive belt continually breaking
« Thread Started on Oct 19, 2010, 2:56pm »

Hello, I have a 150cc Chinese scooter that is snapping drive belts like twigs. I recently replaced my starter clutch and shortly after it snapped the original belt with about 2200 miles on it. Since then I have snapped 4 more including 2 Kevlar belts. The last belt that broke, I had replaced my worn roller weights but was missing two of the slide keys. Would the missing slide keys cause the belt to over heat and break, or possibly something got out of alignment when I replaced the starter clutch? I have new keys and a new belt on the way but just wanted an opinion before I lose $40 in 10 miles.

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demonfurbie
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Re: Drive belt continually breaking
« Reply #1 on Oct 19, 2010, 3:01pm »

sounds like a tension issue

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tortoise
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Re: Drive belt continually breaking
« Reply #2 on Oct 19, 2010, 3:20pm »

Per Scrappy Dog . . .

"Belts breaking all the time!

Here is a reverse MO! question answer. This time it was MO! calling out to all those scootdawgs out there who might know why so many belts are broken on certain scooters. This was a reply from someone who kept breaking belt after belt, and seemed to try everything, then after he changed the rear clutch/pulley assembly, he wrote back this reply below. It seems that the inner bearing would pit and run rough, causing excessive heat, and transfering heat to the belt through the rear sheaves of the pulley. Heat and rubber don't do well together for long!

MO! It (rear clutch/pulley) was causing all the heat (a bad needle bearing in the clutch), and I have about 500 miles on my scooter since replacing the clutch with the one I purchased on your site, and it's running great, so you my want to advise people to pull the clutch as part of their normal maintenance routine (every 1,500 – 2,000 miles should suffice), and feel if the bearing has any rough spots in it; this can easily be done by inserting your index finger into the bearing and spinning the clutch on your finger, and if the bearing does not roll freely, or you can feel any rough spots in it, it’s probably getting close to time to change the bearing (if you can find one), or the clutch, because you can warn them if they don’t, they’ll probably be pushing their scooter home from wherever they are when the heat from the bad bearing, melts the belt. -helpful scootdawg no longer changing belts all the time!"

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sunnydaze
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Re: Drive belt continually breaking
« Reply #3 on Oct 19, 2010, 4:17pm »

Clutch appears to be fine, any other ideas?

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netmare
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Re: Drive belt continually breaking
« Reply #4 on Oct 19, 2010, 4:43pm »

Oct 19, 2010, 4:17pm, sunnydaze wrote:

Clutch appears to be fine, any other ideas?

Have you pulled it of and followed what was suggested?

Also, the quoted text does say something about heat, which you also mentioned. The heat doesn't HAVE to come form what the text suggested, but could come also form the variator.

Food for thought.

cg

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sprocket
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Re: Drive belt continually breaking
« Reply #5 on Oct 19, 2010, 4:49pm »

Clutches may 'appear' to be fine, but the bearing could be bad...

It is probably heat related... pop the 'filter' at the front of the CVT and run it without it for a few days and see if the heat does away. After a few hours ride you should be able to hold your can comfortably on the CVT... anything hotter and you have restricted cooling of a bad bearing...

« Last Edit: Oct 19, 2010, 4:51pm by sprocket »

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als01seville
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Re: Drive belt continually breaking
« Reply #6 on Oct 19, 2010, 4:55pm »

Well from what he said I think it is his Variator that is binding. He even said one or two of the V sliders were damaged and that would cause binding of the Variator. Also I would put on either Bando Brand or Gates Powerlink belts they stretch a little.
Alleyoop

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sprocket
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Re: Drive belt continually breaking
« Reply #7 on Oct 19, 2010, 4:59pm »

I just assumed that he had fixed the sliders and he still had a problem...

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sunnydaze
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Re: Drive belt continually breaking
« Reply #8 on Oct 19, 2010, 5:22pm »

I have new slides now but am still waiting for the belt. I was hopping that it is just the missing sliders before I destroy another belt and while I have the cover off. I do appreciate the quick responses. I have had 2 Kevlar belts but the one on order is a gates.

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sprocket
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Re: Drive belt continually breaking
« Reply #9 on Oct 19, 2010, 5:54pm »

Kevlar belts don't stretch and they go like wood in colder weather...they may last longer
but I think a regular Bando or PowerLink are just fine...

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buiditright
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Re: Drive belt continually breaking
« Reply #10 on Oct 19, 2010, 6:08pm »

I had the identical per your quote problem with my scooter.. belts including kevlar snapping like twigs. I checked the clutch it appeared to be fine.. I replaced the torque drive and clutch complete and have not had a belt break since. That has been thousands of miles at least 4000. I sold the scooter and told the guy who bought it to keep an eye on it and he just keeps on riding... Also when I replaced the torqure drive I replaced the varator with a quality prodogy because when the torque drive went up it tore up the varator..

Bill

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als01seville
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Re: Drive belt continually breaking
« Reply #11 on Oct 19, 2010, 6:18pm »

Does anyone know what that Warning Level-25% is?
Alleyoop

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swakk
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Re: Drive belt continually breaking
« Reply #12 on Oct 20, 2010, 12:22pm »

their s not a lot of reasons for belt problem
worn slider
worn or used variator
bent axel (variator or clutch)
bad belt size
worn bearing (clutch)
too hard contra spring
seized clutch pulley
worn clutch pulley (each side don t move parallel (one is worn or broken)

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