Use and Care Manual

Troubleshooting
Engine does not start or is hard to start
Troubleshooting 32
1. Examine the Carburetor
- Be sure there is fuel flowing into the carburetor.
Is there fuel flowing into the carburetor?
No - Clogged fuel hose/line or clogged fuel filter
- Clogged Fuel Valve
- Clogged fuel tank breather hose
- Sticking or stuck carburetor float
Yes - SEE STEP 2
2. Examine the Spark Plug - Remove the spark plug and inspect. (see page 23)
Is the spark plug in good working condition?
No - Flooded engine and/or carburetor
- Choke valve is closed
- Throttle is stuck open
- Dirty or clogged air filter
- Excessively worn piston rings (replace engine)
Yes - SEE STEP 3
3. Spark Test - Test for ignition spark by removing the spark plug and inserting it into the spark plug cap. Place the open
end of the spark plug on a metal part of the engine and kickstart the engine. You should see a nice blue spark on the end
of the spark plug. A faint spark will not start the engine.
Do not touch the spark plug or plug cap while kickstarting the engine. You will receive and electrical
shock which could result in serious injury or death.
Is thereagood spark?
No - Fouled or faulty spark plug
- Broken or shorted spark plug wire or spark plug cap
- Broken or shorted ignition coil
- Faulty ignition CDI Box
- Faulty or shorted magneto assembly
- Broken or shorted engine stop switch
- Loose or corroded wires and/or connectors (always clean bad electrical connections)
Yes - SEE STEP 4
4. Cylinder Compression Test - Perform a simple compression test by kickstarting the engine slowly. Be sure you have
the spark plug installed. While pushing down on the kickstarter slowly, you should feel a very hard firmness that will
abrubptly soften as the kickstart lever moves further down. No hard firmness in the kickstart lever means you have poor
compression.
Is the compression normal?
No - Valv
e stuck open/seized or improper valve timing (see your Authorized Monster Moto Service Center)
- Worn cylinder wall and/or piston rings (replace engine)
- Leaking or damaged cylinder head gasket (see your Authorized Monster Moto Service Center)
Yes - SEE STEP 5
5. Engine Start Condition - Start the engine by using the normal starting procedre (see page 15,16)
Does the engine start but then stop quickly afterward?
Yes - Improper choke operation
- Dirty or improperly adjusted carburetor (Contact your Authorized Monster Moto Service Center)
- Intake manifold/pipe leak
- Improper ignition timing (see your Authorized Monster Moto Service Center)
- Dirty or contaminated gasoline
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