i lost my chuffing sound on my mth 30-1115-1 K4 pacific. the bell and whistle work fine, when i add power to the engine you can hear the engine start up. when it begins to move ther is no chuffing sound. if i give it full throttle i get a speratic sound but not what its supposed to be.
what controls the chuffing to the wheel revolution. is there a pickup that may need cleaning or adjusting?
any help
stephen