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Discussion Starter · #1 · (Edited)
I got a little piece of knowledge on the weekend that I thought some of you might find useful. I took the rear wheel out of my sporty so I could fit a new tire. For about a year I noticed my belt was running near the right side of the pulley and wondered if the alignment was a little bit off. When I was taking a close look at the pulley I noticed one of the teeth had a small bit of rock crushed and wedged hard on the left of one of the valleys. I'm betting that was why the belt was always over on the right.
 

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Sporty belts ALWAYS run to the right, unless you back them up.

Big VTwins run to the left.

It's a safety feature to keep the belt out of the rim/hub area if it breaks.

I'm just here for the beer.
 

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Sporty belts ALWAYS run to the right, unless you back them up.

Big VTwins run to the left.

It's a safety feature to keep the belt out of the rim/hub area if it breaks.


Are you SERIOUS!?!?
My big twin belt tracks to the left going forward, and to the right going backward. I'm going insane trying to figure out how to cure it.
SERIOUSLY!?!?
I can just let it go?!?!
THANK-YOU!
How do people learn about this stuff
 

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The reason is alignment. And with that said, flat or cogged belts on stub shafts (bearing on one side of pully/sprocket only) will run away from the bearing. As the load increases and engine, bearings, and chassis flex, the movement will be greatest on the unsupported side of the shaft. This is 1935 FFA stuff.

If you look at an old flat belt drive on a tractor, the stub shaft support always protrudes more than halfway through the pully. This helps to minimize the tendency of the belt to run off of the pully. They also used pulleys that were tapered so as to be slightly smaller in the center of the drive surface. Harley just lets the belt move, and uses fences to keep it on the sprocket.


And Alan is correct about which way they move on different scooters.
 

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I totally get it, Therm, great explanation. When I considered how belts as in belt sanders are adjusted, it caused me to believe there was an alignment issue.
Spent a lot of time trying to adjust it out before finally just giving up!
 

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How bout backing up a steerable wagon, did youens get to learn how to do that? That's a real skill when it comes to tractor driving.
I've watched my dad back a wagon like a pro.

I can back trailers of all sizes. Wagons look like a cluster ****.

I'm just here for the beer.
 
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