A utility quad that debuted in 1989, the Yamaha Timberwolf is a small ATV that was in production for over a decade. Not as powerful as many of Yamaha's other utility quads, it features a 230cc engine while still holding its own on the trails. The Timberwolf was generally well-received in its later years and was particularly noted for its reliability. In 2000, the make's final year, Yamaha outlined troubleshooting instructions in its owner's manual.
- Skill level:
Things you need
- Unleaded gasoline
- Shop rag
- Compression gauge
- Spark plug wrench
- NGK D7EA or DENSO X22ES-U spark plug
- 12-volt, 12 ampere-hour battery
Check the level of gas in the fuel tank if the Timberwolf will not run or start.
Refill the tank with unleaded gasoline if there is no fuel in it. Restart the engine.
Turn the fuel cock to "RES" and try to restart the engine if there is a small amount of fuel in the tank.
Turn the fuel cock off if there is an adequate amount of fuel in the tank.
Remove the fuel pipe and check for fuel flow.
Clean the fuel cock if there is no fuel or if fuel is mixed with water or debris as this is a sign that the fuel cock may be clogged. Restart the engine.
Operate the electric starter.
Test for compression by removing the spark plug then turning off the ignition coil.
Insert a standard compression gauge into the spark plug hole in the single cylinder and crank the engine. Compression levels should be between 63.5 and 72.6 Kilogram.
Take the Timberwolf to a Yamaha dealer or authorised service centre if there is no or little compression and have them inspect the system.
Remove the spark plug and check the electrode.
Dry with a clean cloth if the electrode is wet.
Attach the plug gap and ground to the chassis.
Operate the starter.
Move onto next section and the battery check if the spark is good.
Check the condition of the spark plug if there is no spark or the spark is weak. Replace with an NGK D7EA or DENSO X22ES-U spark plug if the original appears damaged or otherwise defective.
Set the spark plug gap between .024- and .028-inch.
Operate the electric starter again. Take the ATV to a certified mechanic if the spark is still weak or nonexistent.
Use the starter and listen to the engine.
Take the quad in for a general inspection if the engine turns over quickly as this indicates that the battery is working properly and something else is the problem.
Tighten the battery connections and charge to it 12 volts if the engine turnover is slow.
Replace the battery with a 12-volt, 12 ampere-hour type if the battery appears damaged.
Restart the engine. If it still fails, take the Timberwolf to a Yamaha dealer for repairs.
Tips and warnings
- Never smoke, while working on the fuel system or with quad batteries, as this can cause explosive fumes to ignite. Keep open flames far away from both systems.
- Wear eye goggles and gloves when handling batteries to avoid burns.
- Don't attempt more serious repairs without the proper training, tools and Yamaha-certified parts. Yamaha recommends that owners take the Timberwolf to an accredited dealer if troubleshooting fails.
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