The 4x4 won't disengage on my fathers 650, no matter what I do. Only has 550 miles. Any ideas?

 

I think you have a similar problem as people with a 4x4 that won't engage. Some people are telling us that the sensor goes bad due to water. Seems to be what goes bad first. The manual gives a procedure to follow to test it. I am at work and can't look it up.

Maybe someday, a diagnostic tech tip will show up for this in the Nyroc Knowledgebase.

I wish I could be more help.

Maybe it is the fuse. That motor has to get power to move back to 2x4.

Check the handle bar switch first.

 

Read the post just below you on 4x4 wont engage,I gave some advice in there ,maybe that will help you out