Honda HHT25S Manual page 19

SERVICE INFORMATION
8. TROUBLESHOOTING
GENERAL SYMPTOMS AND PROBABLE CAUSES
Engine does not start or is hard
to start.
SERVICE BULLETIN #5 =>
Engine lacks power.
2-8
Fuel in the carburetor is old.
Spark plug disconnected or no
spark at the plug.
Fuel tank tube restricted.
Fuel filter restricted.
Carburetor problem.
Ignition coil air gap incorrect.
Ignition coil faulty.
Spark plug faulty.
Air cleaner restricted.
Valve clearance incorrect.
Spark plug faulty.
Air cleaner restricted.
Valve clearance incorrect.
Cylinder, piston, or piston rings
worn.
Spark arrester or muffler
restricted.
HHT25S•HHT35S
Drain the old fuel and then
inspect and clean the carburetor
P. 5-3, P. 5-8.
Inspect P. 3-11, P. 2-14.
Inspect P. 3-14.
Inspect P. 3-14.
Adjust P. 5-5, P. 5-10.
Disassemble/clean P. 5-3, P.
Adjust P. 7-9, P. 7-15.
Inspect P. 7-8, P. 7-14.
Inspect/replace P. 3-11, P. 2-14.
Clean P. 3-3.
Adjust P. 3-10.
Inspect/replace P. 3-11, P. 2-14.
Clean P. 3-3.
Adjust P. 3-10.
Disassemble/clean P. 9-5.
Inspect P. 9-6.
Clean P. 3-12.
5-8.