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sounds like you have either stretched chains or worn sprockets. Also check the outer bearing that the shafts fit into for wear. If they wear then the chain can't retain it's tension properly, get sloppy and then derail itself. Most likely your bearings is the problem.
First remove the chain--- lay it flat on the floor --streched lengthwaze . grab either end and pull out and push back--- if chains length moves more than a quarter of a inch ---replace the chain. Next inspect the sprokets, if they are worn inward on the side they will let the chain drop on too far making the chain jump and rattel as it runs and this will throw the chain. Next inspect allignment of each spoket to the next sprokets with belt drive the belt will flex and this is not critical with chain drive this will load one side of each spoket causing the chain to jump off.
top idler sprocket was out of alignment,staitened plate it was attached to, then chain was running true and went on just fine. it was an old wheel horse snowblower.
Go to a web site like bikebandit.com and pick the make year and model of your bike to see the part diagrams. Find the drive chain page and it will usually tell the size of the chain.
Chute rod not attached
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