Question about Yamaha 2005 Grizzly 660 Auto 4x4

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Have a 2005 660 Yamaha Grizzly. The screen that shows hours, gas, gears etc. Is not lighting up. Saw an "E" then it came on a few times now just won't come on at all. Is there a way to check the u

Electrical issues with LCD screen not working.

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The first thing I would check would be the fuse box. Next, take a look at the the electrical connections for the LCD screen. You've got an off-road toy which most likely is subjected to lots of vibration and occasionally moisture. Do what's necessary to access the back of the dash and check to make sure the electrical connection is still plugged in. If so, unplug it and check for corrosion. According to your description the entire screen is out, so most likely it's not an individual sensor. The bike probably has several electrical ground locations on the frame. Check to ensure they are all clean (bare metal to bare metal) and tight. If it's still not working at this point, you are probably going to need to start looking for broken or grounded wires. You will need a multi-meter to do this properly. If you've never used one before, watch a couple videos on YouTube on how to do an ohms test, then disconnect the battery and test each wire from the LCD screen plug to where ever it terminates.

Finally, it's always possible the screen itself is actually dead. I don't know of a way to test to know one way or another. If you have a friend with the same bike, you can always swap the screen to know for sure.

Good luck!

Posted on Nov 30, 2013

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Posted on Jan 02, 2017

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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.
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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.
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Check fuel hoses for cracks or leakage.
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Check the compression.
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If no compression exists, contact a Yamaha dealer.
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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.


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