Cub Cadet MTD 70 Series - Manual (Page 37)

B ASIC T ROUBLESHOOTING
31
ENGINE MISFIRES
Improper Valve Lash
Weak valve spring
Excessive carbon build up
Carburetor improperly adjusted
Ignition timing or
incorrect spark plug
Valves sticking or not
seating properly
Wrong or fouled spark plug
Bent crankshaft
ENGINE VIBRATES
EXCESSIVELY
Attached equipment out
of balance
Loose mounting bolts
If applicable counter balance not
properly aligned
Engine Operation Problems