Shredding Belts... Belt too short??

[acidburn02zts]

Hey guys...


So, after installing a new big bore kit (same size as what was on it before) and tuning the carb, I shredded my gates belt. Belt only had 400ish miles on it.


Pulled it apart and the belt had been shredded. The CVT was stock so I figured it was heat/slip related. Installed a 1k rpm contra spring and 1500rpm clutch springs with a new Bando belt.

Belt lasted 50 miles or so and it shredded again.

Both of these belts were 729 -18-30. (gates was 729 - 17.5 - 30)  The scooter came to me with no belt.

Both of these belts were a PITA to get on.  Had to disassemble the variator to slip the belt on then re-assemble.  The Bando was tighter..  no slack in the belt and it was pulled down in the rear pulley a little bit (1/4-1/2" from the top of the pulley) and the belt was under a LOT of tension.  The Gates fit the pulley better but had no slack or give..  very tight.  With the Bando belt, with the variator disassembled, I still had to "roll" the belt up onto the center of the pulley which pulled the belt down a bit into the rear pulley.  No slack what so ever.

Do they offer slightly longer belts?

Anyone have a suggestion on how to find the right belt?  This is some no-name scooter with a long case GY6.

At $30 a pop...  I really don't want to keep shredding belts.

Thanks

[tortoise2]

Jul 1, 2019 10:29:46 GMT -5 acidburn02zts said:

scooter came to me with no belt . . long case GY6

Rear wheel size?

[acidburn02zts]

Jul 1, 2019 10:38:50 GMT -5 tortoise2 said:

Jul 1, 2019 10:29:46 GMT -5 acidburn02zts said:

scooter came to me with no belt . . long case GY6

Rear wheel size?

I think it's a 12 but I'll have to check.  At work at the moment

[acidburn02zts]

Doing some reading... apparently Gates belts run a bit longer than Bando even though they are the same marked size.

May try going back with a Gates and see if it holds up better.

[tortoise2]

Also listen for a bad clutch bearing.

[acidburn02zts]

Jul 1, 2019 13:36:19 GMT -5 tortoise2 said:

Also listen for a bad clutch bearing.

When I had the clutch apart, that bearing was tight/dry and rusty.  I cleaned it out and packed it with grease..    perhaps I need to replace the whole assembly and be done with it?

[SMALL CC TEK]

Check your clutch the driven portion that moves . If you can rock the face back and forward ,like squeeze the back then squeeze the front side if you have any movement you should replace it . If you can make it wobble even a little it will heat and blow belts . Why ? the pulley locks on a lets go causing a slight jerk sometimes that is the first symptom most times be for it snaps the belt !