Join Date: Jul 2012
Location: Ridgway, Colorado
Thanked 3,710 Times in 2,339 Posts
Rep Power: 130
Cleaning a plug has not been found to work, there can be visible spark to the eye with that spark not hot enough.
If you can once it is going, take it for a ride and get it hot before shutting off the engine. The engine may not be fully broke in yet. Yamaha valves are known to stretch slightly in the first 1000 miles requiring the valve lash to be checked and re-set on many grizzlys.
Fast Green Convertible "06" 660 on 26" BH OG's with Stock Wheels.
COOP45 Primary, 1.5 mm shim, -1.5 mm belt, Purple Secondary Spring,
21 gram weights, weight covers reduced to 29 mm diameter and a 2 mm Cut Cam Plate.
2 heat range hotter plug, Warn Winch, Passenger Foot Rests, Rock Deflectors, Heated Grips and Hand Mitts,
Grab Strap, Cooling System Up-Grade and multiple position mirrors.
8040 miles, 812 hours on 1-1-15