TROUBLESHOOTING
Page S-3
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notes, Cautions and Warnings.
B
B
ENGINE RUNS ROUGH OR LOSS
OF POWER
Dirty or clogged air filter element
Wash or replace as required
Incorrect choke adjustment
Adjust choke
Dirty or incorrectly gapped spark plug
Clean plug and set gap
Faulty Ignitor
Check and/or replace
Leak in carburetor gasket
Inspect and replace if required
Faulty ignition wiring
Repair/replace correct wiring
Faulty coil
Test and replace if necessary
Incorrect valve lash
Check and adjust if required
Weak or damaged valve springs
Replace
Damaged intake/exhaust valves
Replace
Incorrect carburetor float setting
Adjust float setting
Dirt or water in fuel line, carburetor
Clean lines, carburetor and replace filter
Plugged fuel tank vent
Clean or replace vent cap
Muffler damaged or plugged
Repair or replace
Fuel pump vent dirty
Clean and replace if required
Fuel pump has a ruptured diaphragm
Replace
Low compression
Check engine
Poor quality of fuel
Drain and replace with correct clean fuel
POOR LOW SPEED
PERFORMANCE
Plugged gas tank vent
Clean or repair
Choke on
Push choke in
Carburetor float level incorrect
Adjust
Pilot screw
Clean or adjust as necessary
Fuel pump faulty
Repair or replace
Insufficient fuel level
Add fuel
Air leak at carburetor gasket
Repair component
Spark plug fouled
Clean or replace
Weak spark
Check ignition coil
Incorrect valve lash
Check and adjust
Condition
Possible Cause
Correction