14
Owner’s Manual
150CC VIPER 4-CYCLE ENGINE
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M-F 8-5 CST
TROUBLESHOOTING GUIDE
PROBLEM
POSSIBLE CAUSE
REMEDY/ACTION
Engine will not start
1. Power switch off
1. Flip switch to ON position
2. Spark plug wire disconnected
2. Connect spark plug wire to spark plug
3. Out of fuel
3. Refuel
4. Spark plug wet, faulty or improperly
gapped
4. Clean, replace or gap spark plug
5. Stale fuel
5. Drain old fuel and replace with fresh.
Use fuel stabilizer as a future preventative
measure.
Engine runs rough, floods during
operation
1. Dirty air filter
1. Replace air filter
2. Carburetor out of adjustment
2. Call factory
Engine is hard to start
1. Stale fuel
1. Drain old fuel and replace with fresh. Use
fuel stabilizer as a future preventative
measure.
2. Spark plug wire loose
2. Make sure spark wire is securely attached
to spark plug
3. Dirty carburetor
3. Clean carburetor, use fuel stabilizer, and
fresh fuel
Engine misses or lacks power
1. Clogged fuel tank or fuel filter
1. Remove and clean
2. Clogged air filter
2. Replace air filter
3. Improper carburetor adjustment
3. Call factory
4. Spark plug dirty, improper gap, or
wrong type
4. Replace spark plug and adjust gap to
.030"
Engine runs, then quits
1. Fuel cap not venting
1. Replace fuel cap
Contact a service provider if above remedies fail.
