2005 Yamaha Big Bear 400 4*4 issues

[sjh_1982 10]

I've got the rear end popping when its under a load, I know that can't be good, but its also blowing oil out of blow by hose? Why I don't know, it hasn't been over filled with oil, also has gas in breather box. Does anyone have any ideas? Atv only has 400 hours on it.

[Ajmboy 151]

Check your air filter for the blow-by. as far as the popping noise in the rear, it could be the ring and pinion or a something else like a mount or control arm, bushing, etc. It's hard to diagnose wiithout being there...did you get a second opinion from anyone?

[sjh_1982 10]

The hose that blowing oil is coming off the top of motor, it does not run to breather box, I don't even see anywhere for it to conect to breather box, local repair shop, said gears in rear end were going out and would need whole new rear end. They said its all one piece in rear end have to replace everything, i think that is crap, lol.

[oxidized_black 43]

i would check all the vent lines from the motor. if the motor can't breathe, it will send oil thru the weakest link or breatheable tube. how's the compression and is the carb dirty or sticky float?

[sjh_1982 10]

Yeah the carb is dirty.