Belt Confusion

[bread]

So i got this manco silver fox thing and the belt broke

The original belt is 5/8" wide, do these things wear that much over time in terms of width?

The new one I ordered is 3/4" wide. I ordered it because it said 5959 in the item description, I was naive of the different widths and thought if the numbers were the same, it would be the right belt. turns out none of the numbers match the original belt

Well the new one fits a bit tighter and the clutch wants to engage pretty much at idle so when you pull the starter, the whole thing tries to move

I think its a CAT99 torque converter because its an asymmetric belt, but I don't know where I can find a replacement belt that is 5/8" wide

old

new

Thanks for any help

 

[kevbo22]

This amazon description says it is 3/4. so I think your good.
https://www.amazon.com/Manco-5959-Replacement-Kart-Belt/dp/B00F0RQQC4
also, one of the reviews on that link say that there belt width was worn, so yes I think its possible.

 

[bread]

This amazon description says it is 3/4. so I think your good.
https://www.amazon.com/Manco-5959-Replacement-Kart-Belt/dp/B00F0RQQC4
also, one of the reviews on that link say that there belt width was worn, so yes I think its possible.

Right but the new one is not the right belt because the clutch wants to engage as soon as you pull the starter. The kart wants to move when you pull it

Maybe because the wider belt cannot sink as far down into the groove causing the ratio to be higher and higher rpm so it engages?

Has anyone had a belt that was significantly reduced in width after many uses?

 

[Whitetrashrocker]

When I replaced my belt I had the same issue. The old one was about 5/8" and the new was a 3/4".
The old one was pleased to wore out and had spots that were thinner, down to 1/2" or so. Like it sat and idled a long time wearing only one spot thin.

I also had the problem of engagement at idle. I found the brass rings the belt rides on at idle were sticking to the shaft. I dissassembled the clutch, removed the snap ring and the 2 rings behind it. Made a quick arbor and put it in my drill press. Took some fine sand paper to it and polished it back up. Sanded the inner side of the brass rings and reassembled.

Now the belt sits on the brass rings and they do their job of slipping.

No more premature takeoffs.

 

[bread]

When I replaced my belt I had the same issue. The old one was about 5/8" and the new was a 3/4".
The old one was pleased to wore out and had spots that were thinner, down to 1/2" or so. Like it sat and idled a long time wearing only one spot thin.

I also had the problem of engagement at idle. I found the brass rings the belt rides on at idle were sticking to the shaft. I dissassembled the clutch, removed the snap ring and the 2 rings behind it. Made a quick arbor and put it in my drill press. Took some fine sand paper to it and polished it back up. Sanded the inner side of the brass rings and reassembled.

Now the belt sits on the brass rings and they do their job of slipping.




No more premature takeoffs.

Thanks, do you have a pic of exactly what you did?

 

[Whitetrashrocker]

No I don't have a pic but a member of this forum made a nice video on how to clean the torque converter.
https://youtu.be/a3FCcLlR-sg

Once you have it apart to will see two more brass rings behind a keyring shaped snap ring. Just flip one end out of the groove and work around till it's off.

I used some washers and the stepped washer from the crank bolt with a long bolt to make an arbor.
Put it my drill press to spin and polished.

 

[bread]

Ok I put the 3/4" belt back on and it works fine now. I think the driver part of the TC was not aligned