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gomi_otaku
gomi_otaku, Technician
Category: Motorcycle
Satisfied Customers: 3378
Experience:  VW Technician, VW FastTrack, VW Academy, VW Certified
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2010 grizzly 700. After being used around the yard 2 hrs,

Customer Question

2010 grizzly 700. After being used around the yard for about 2 hrs, machine backfired and died. Hard to start now. Have to pump the throttle while cranking. wont idle. Seems to run fine under full throttle. Smokes, cant quite tell if its blue black or white. Machine has 500 easy miles on it. No engine light. Using the diagnostic mode, the components i can test seem to be with in normal limits. Temp sensor tps, lean angle sensor and i cant remember what ever else you access through the computer. Fuel pressure checked with an inline pressure gauge, good. All the hoses/vent lines are are clean and clear. Injector seems to spray a nice pattern, but was sent to a local reliable injection shop to be cleaned and checked. no change. Top end disassembled and inspected, every things looks new inside. Fuel drained and replaced, no change. wiring harness inspected, no wear or chaff marks. Exhaust is not clogged. Leak down test performed on cylinder and then head separately, while it was apart. Zero leak down on head, and minimal leak down on cylinder. All fluids are full and changed regularly. Oil looks/smells normal. The air filter did have a mouse nest and was nasty (air filter is flat and sits horizontally). brought it to the dealer, they charged my 45 to tell me it would cost 1500 to tear it down and put it back together.
Submitted: 5 months ago.
Category: Motorcycle
Expert:  gomi_otaku replied 5 months ago.

adjust the valves- they wear and get tight (intake especially) You probably are just in the range where they have seated well and need their first adjustment, after that they don't need it as often

Customer: replied 4 months ago.
valves were within about a half to a quarter turn on the tight side, out of tolerance, per the Yamaha pdf. No change in running condition, though.