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Get a new dealer I do agree with the above answer as well, but... This is from my repair manual for a 2006 Grizzly 660. IGNITION SYSTEM ELEC TROUBLESHOOTING IF THE IGNITION SYSTEM FAILS TO OPERATE (NO SPARK OR INTERMITTENT SPARK Procedure Check: 1.Fuse (main, ignition) 2.Battery 3.Spark plug 4.Ignition spark gap 5.Spark plug cap resistance 6.Ignition coil resistance 7.Engine stop switch 8.Main switch 9.Pickup coil resistance 10.Charging/rotor rotation direction detection coil resistance 11.Wiring connection (the entire ignition system) NOTE: Remove the following part(s) before troubleshooting: 1)Seat 2)Fuel tank side panels 3)Front carrier 4)Front fender Use the following special tool(s) for troubleshooting. Dynamic spark tester: P/N. YM-34487Ignition checker: P/N. 90890-06754 Pocket tester: P/N. YU-03112, 90890-03112 CONTINUITY 1.Fuse (main, ignition) Refer to "CHECKING THE SWITCH". NO CONTINUITY Replace the fuse. CORRECT 2.Battery Check the battery condition. Refer to "CHECKING THE BATTERY" in CHAPTER 3. Open-circuit voltage: 12.8 V or more at 20 °C (68 °F) INCORRECT Clean the battery terminals. Recharge or replace the battery. 3.Spark plug Check the spark plug condition. Check the spark plug type. Check the spark plug gap.

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15y ago
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Q: A 1999 Yamaha Grizzly has no spark and the dealer spent several hours trying to find the problem with no results Any ideas?
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