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Determine whether your engine is equipped with an idle stabilizer. If it is, unplug it and see if idle returns. Otherwise inspect synchronization on throttle arm/timing/carburetors. Synchronization must be done in proper order. Read thru the manual a couple of times to familiarize yourself with the procedure. You could also unplug the bias circuit between the switchboxes to check for trouble there.
Determine whether your engine is equipped with an idle stabilizer. If it is, unplug it and see if idle returns. Otherwise inspect synchronization on throttle arm/timing/carburetors. Synchronization must be done in proper order. Read thru the manual a couple of times to familiarize yourself with the procedure. You could also unplug the bias circuit between the switchboxes to check for trouble there.
Check compression on each cylinder, write it down and then compare.