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▷▷ 2021 ▷ How to troubleshoot a Yamaha 660 Grizzly

5 julio, 2021

How to troubleshoot a Yamaha 660 Grizzly

by Jensen Johansson

atv airborne image by MAXFX from

According to a 2009 “ATV Rider” article, “When the Grizzly was introduced in 1998 as a 600cc machine, the top was blown off right in the displacement wars of the time”. It was replaced in 2002 with the Yamaha Grizzly 660, an even larger engine derived from the well-established all-terrain vehicle (ATV) Yamaha Raptor 660R. The 660-cubic-centimeter (cc) Grizzly four-stroke, single-overhead camshaft, five-valve engine performs well in the open, but sometimes causes serious problems for owners. However, before calling a Grizzly dealer, trying a few tricks in your garage can save you a lot of time and money.

Step 1

Check the fuel level. Locate the fuel gauge gauge at the top of the multifunction display. If it is not working properly, open the fuel tank and push the Yamaha 660 Grizzly from side to side.

Step 2

Make sure the fuel is not contaminated by water or rust. If you haven’t driven your Grizzly 660 for a long time, drain the tank completely and fill it with a fuel tank cleaner.

Step 3

Check the fuel hoses for cracks or leaks. Hoses should be smooth and easy to bend. Replace those that show any signs of wear.

Step 4

Check compression. Screw a compression tester into the spark plug hole and press the electric start button. If there is no compression, contact a Yamaha dealer.

Step 5

Clean wet or dirty electrodes with a dry cloth.

Step 6

Correct the spark plug gap. Measure the gap with a wire feeler gauge. If necessary, adjust it to 0.8mm with a screwdriver or replace the spark plug. Use only a Yamaha specified spark plug.

Check the battery of the Yamaha 660 Grizzly. Operate your electric starter. If the Grizzly starts quickly, then its battery is in good condition. If the engine turns slowly, check the battery cable connections and the battery may need to be replaced. If the engine still won’t start, your Grizzly cannot be repaired at home.


  • Never smoke while checking the fuel system. Fuel can easily ignite and cause serious injury or property damage.
  • Never service an engine while it is hot.
  • Never repair your ATV if you don’t have the necessary tools.
  • Electrical components can cause electric shock or start fires.
  • Wear gloves when replacing a battery. Batteries can leak acids.

Articles will need

  • Gloves
  • Fuel tank cleaner
  • Compression tester
  • Dry cloth
  • Wire thickness gauge
  • Screwdriver
  • Spark plug (optional)
  • Spark plug wrench
  • Ratchet

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