2009 grizzley does not run well in 2 or 4 wheel drive (misses). Runs good in 4-wheel dif-lock. Anyone have any ideas??

 

First welcome to the forums! How many hrs on the quad and when is the last time you went through deep mud or water?

 

little over 200 hrs and went thru somewhat deep water 2 weeks ago

 

I would start with a fresh oil change and new spark plug if you have not done so! You might be at risk of slight engine damage!

 

i'm leaning toward an electrical problem. engine runs fine when in 4 wheel dif-lock. Thanks for your help!

 

A electrical problem is very rare tho anything is possibility! A coil issue might a result as well!

 

Found out there were 3 fried wires due to electrical short. Short was caused by loose ground bolt. Appears YAMAHA's assembler failed to seat bolt tightly. Of course YAMAHA denies this. Dealer spent over 20 hours finding shorts. I'm done with YAMAHA!!

 

I hope they didn't charge you 20 hrs. labor!

 

Nope. Only 5 hours. Attempting to get that back from Yamaha. Dealer was great. Yamaha reps SUCK!

 

Some things never change.