I bought a 650 v2 this past winter, the damn thing has never run right. I of course had no idea what the previous owner has done. After much tweaking,(Vforce clutch work, Dyna tech ignition, etc..), out of desperation I took it to a dealer, they rejetted etc, still runs like poop or worse. Twice in the last few months, I had a similar thing happen, I had the quad idling n warming up and it seemed to load up, I took it out and tried to blow the crud out it was running horribly and it was smoking badly and running worse. When I returned I realized my right pant leg was covered with oil, I traced it to the duck bill drain out of the bottom of the aircleaner box.
On tear down to the airbox it seems the rear cylinders carburetor's rubber boot had more oil in it which might make you think it is the rear cylinder with the valve issue. BUT...if I think this through, and I am thinking a stuck intake valve is the problem, the rear carb rubber boot may have collected more oil residue due to the fact that its valves are operating properly, creating a negative pressure and inhaling the oil and fuel residue expelled out of the Front cylinder with the stuck intake valve into the airbox!!!
My head hurts!
Could this be a stuck valve, what the heck else could create enough positive pressure in the airbox to make it spew oil and fuel onto my pant leg?
am I barking up the wrong tree? W
What do you think?