p.s running it without the air filter makes no difference.

 

too much air would mean it was lean

 

I played around with it some more tonight and it does not seem to be running rich anymore. Thought it was dark when I got home so I wont know for sure until morning when I can pull the plug. It still has no power though, it acts like it's only running at 50%. It tops out at 50km/hr... it should hit 50mph I would think. I will try and get that video tomorrow.

 

Im having the same problems with my 98. I have tried everything! Keep us posted

 

mine is getting a complete top and bottom end rebuild... very very expensive... BUT i'm doing everything and including some upgrades so I'll have a nice machine when I'm done.

Check your timing chain as well as your cam, they caused the problems on mine. Timing chain was completely worn out! The self adjuster was all the way in and it still had about 1.5" of slack in the chain! The cam was also missing some parts, not sure how it happend but it had big chunks right out of it, likely from lack of oil as the valves are also shot. Connecting rod is wore out.. not a great first experience with atving... with the money that I will have into this friggin thing, if I added on another 2k I could buy a brand new Sportsman 400... wish I had of lol.