Re: Which clutch is bad?
Sounds like the primary may be jammed. Typically if the primary is stuck it will drag the belt and try to make the cart roll all the time.
Take the belt off and try to close the moveable sheave of the drive clutch by hand. It should move pretty smoothly. If not, that's probably your problem clutch. What type of clutch is it? Most can be rebuilt, but that also depends if there is wear on the sheaves.
If the secondary is stuck it will not open and allow the belt to pull down, which can prevent the primary from closing. This will cause what you describe, staying in the lowest ratio. Usually the secondary is not able to be opened by hand, so the only way to verify it's a problem is to disassemble it. But usually if the primary is working properly you should still be able to see it close in just a bit and grab the belt as the engine starts. It should also open up away from the belt when the engine stops.
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