Operator's Manual
Viper® 99cc 4-Cycle Engine
18
For additional information email
or call 800-345-6007 M-F 8-5
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 op-
eration
1. Dirty air filter
1. Clean or replace air filter
2. Choke partially engaged
2. Turn off choke
3. Carburetor out of adjustment
3. 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, new
fuel can
Engine misses or lacks power
1. Clogged fuel tank or fuel filter
1. Remove and clean
2. Clogged air filter
2. Clean or replace
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.
