Belt Drive issue

After re-assembling the entire primary drive (Dominator with Atlas engine) I have a problem with the belt drive. When I am riding, the belt occasionally touches the inner primary case.

I bought the bike with the belt drive so no idea who the manufacturer is. On the pully, there is only one guide plate (golden) and it can only go on the outer side.

I did realize that there is maybe a bit too much tension on the belt but I cannot imagine that this can cause the belt to move sideways.

Any ideas?

https://www.dropbox.com/l/scl/AADvXa8IHdo2bGB8rl_jTbOQyNUaz7maN54

How many gearbox tensioners do you have, its common with belt drives to have 2, 1 on each side of the gearbox so the mainshaft can be aligned better so then the belt then wants to move to touch the flanges.

There is only one tensioner. But I have done some research on the topic and found out that the alignment of the gearbox mainshaft to the crankshaft is crucial. Which now is totally obvious to me. Will work on it and post an update.

Happy to report that the issue is resolved. I put spacers in the slots of the left side gearbox mount, then used the tensioner on right to bring the gearbox into a position where the belt stays in the center of the pully.

Do you have pictures of the spacers or what you used to make them?

Scott

I put a little piece of aluminium into the slot of the left mounting plate. When I pull the gearbox back with the adjuster on the right side, the left side of the gearbox can only go back until the aluminium piece goes against the left mounting plate. The thickness of the aluminium piece needs to be correct so that the belt tension is right. I will install a second adjuster when I have the primary case apart next time.