Simplicity RTH Series Operator's Manual page 31

Troubleshooting
2. Engine starts hard or runs poorly.
A. Fuel mixture too rich. Move control out of choke. If problem still exists, clean air filter.
B. Carburetor adjusted incorrectly. See your engine manual.
C. Spark plug faulty, fouled, or incorrectly gapped. Clean and gap or replace.
3.
Engine knocks.
A. Low oil level. Check/add oil as required.
B. Using wrong grade oil. See Normal Care section.
4.
Excessive oil consumption.
A. Engine running too hot. Clean engine fins, blower screen and air cleaner. See Normal Care section.
B. Using wrong weight of oil See Normal Care section.
C. Too much oil in crankcase. Drain excessive oil.
5.
Engine exhaust is black or smoky.
A. Dirty air filter. Clean air filter.
B. Choke not fully open. Move control out of choke and be sure choke opens fully. If problem still exists, check
carburetor adjustment.
6.
Engine runs, but tractor will not drive or lacks power.
A. Check fluid levels (Transmission).
B. Drive belt slips. See problem and cause below.
C. Transmission controi lever in NEUTRAL. Move into forward or reverse.
7. Drive belt slips.
A. Pulleys or belt greasy or oily. Clean as required.
B. Belt stretched or worn. Replace with correct belt.
C. Clutch rod binding in guide. Oil clutch rod. See Tractor Lubrication.
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