Question about Yamaha 2004 Grizzly 660 Auto 4x4

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Is anyone else having problems with a 660 Grizzly being cold natured and will not move without warming up for several minutes in cold weather?

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I have the same problem but I have contacted grizzly about it & they have told me it is standard

Posted on Nov 12, 2014

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Posted on Jan 02, 2017

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2002 660 grizzly red light reverse light comes on then it starts to cut out


sounds like your reverse sensor is bad and the cdi limits rpms while in reverse as a safety thing.

Dec 06, 2016 | Yamaha 2004 Grizzly 660 Auto 4x4

1 Answer

Why won't my grizzly 660 go into neutral so I can start my bike


K, Linkage probably needs adjusted.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

2006 GRIZZLY 660 MOD HELP and SHIFTER ISSUES
http://www.yamaha-motor.com/assets/service/manuals/2008/lit-11626-21-03_griz660_all_1498.pdf

Mar 20, 2016 | Yamaha 2004 Grizzly 660 Auto 4x4

1 Answer

I have a 660 and i put a new battery in it and it is.not charging do anyone have a diagram on how to.install a new charging system.


could be the stator or rectifier. rectifiers are easy to test since they're just a diode bridge to convert ac to dc. you'll need a service manual to check the stator. check the bluetraxx forum for one maybe.

Oct 07, 2015 | Yamaha 2008 Grizzly 660 Auto 4x4

2 Answers

Why would my 660 grizzly pop in & out of forward gear, jus whines, jumpin in & Out ???


Grizzly 660 Shifting problem. - Yamaha Grizzly ATV Forum

www.grizzlycentral.com > ... > Grizzly Engine & TransmissionMar 12, 2012 - 4 posts This is a discussion on Grizzly 660 Shifting problem. within the Grizzly Engine ....2005 grizzly 660 gear position sensor problem.

Aug 17, 2015 | Yamaha 2005 Grizzly 660 Auto 4x4

1 Answer

Backfires when you try to rev up engine,


check fuel flow and check spark at spark plugs

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

Check the fuel level.
Locate the fuel meter indicator on top of the multifunction display.
If it does not work properly, open the fuel tank, and push the Yamaha 660 Grizzly side to side.
Ensure the fuel is not contaminated by water or rust.
If you have not driven your Grizzly 660 for a long time, drain the tank completely, and fill it with a fuel tank cleaner.

Check fuel hoses for cracks or leakage.
The hoses should be soft and simple to bend.
Replace those that show any sign of wear.

Check the compression.
Screw a compression tester into the spark plug hole, and press the electric starter button.
If no compression exists, contact a Yamaha dealer.
Wipe wet or dirty electrodes with a dry cloth.
The spark plug gap should be checked regularly

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

Check the Yamaha 660 Grizzly's battery.
Operate its electric starter.
If the Grizzly starts quickly, then its battery is in good condition.
If the engine turns slowly, check the battery lead connections, and you may need to change the battery.
If the engine still does not eventually start, your Grizzly is beyond home repair.


Jul 23, 2013 | Yamaha 2005 Grizzly 660 Auto 4x4

1 Answer

2003 yamaha grizzly 660 4x4 atv, right side rear axle/cv joint came lose at differential


Yamaha Grizzly 660 2002 2008

get one of these..If you are going to try the repair yourself....
.this is serious, ....
there MIGHT be damaged components that need to be inspected by a professional.

Mar 17, 2011 | Yamaha 2004 Grizzly 660 Auto 4x4

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