2008 Yamaha 660 Grizzly???? Help?

sounds like trans or gears fried heres service manual ------https://www.manualslib.com/products/Yamaha-Grizzly-600-6021693.html-

There isn't one. You have to put one in-
line

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

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

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Sounds like there dif is gone or drive shaft

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.

Have you tried putting the ATV in reverse, drive 5 feet, then put in neutral and disengage the 4x4. I know that has worked with my 660. This has also worked with the diff lock.

The red blinking light is just an indicator that the motor has been revved up in neutral or park. I really don't know the importance of it, but I know you have to turn the key off and back on to get it to go off. Everytime I am checking a water pump on a grizzly that happens.