2002 800 twin problem

[arcticfreak]

Hey guys I have a 2002 800 efi twin mountain cat that I just got from Craigslist. I started ridding and noticed that whenever I hit the 6000 rpm mark my engine starts to stutter and lose speed and power. Also when I give some throttle it would hesitate for couple seconds and the engine stalls and then take off. I can barely hit the 60 mph mark on packed snow. Is it the efi itself or maybe I need to clean something out? Can anyone help? Thanks

 

[j()()se]

First thing I would check is the throttle safety switch. You can bypass it easily to see if it fixes the problem.

 

[Sledbrain2]

Could be a lot of things, fuel pump, injectors, clutching, spark plug wires, tps. I had a 02800 efi for almost 10 years, I would suspect the stator but there are many other things that could produce the same issue.

 

[j()()se]

For sure could be a number of things, but I like to rule out the things the are easy to check. A bad tss can cause those issues, and you just need to unplug it and go for a rip to see if it fixes the issue (note your kill switch won't work with it unplugged)

 

[Idcatman1]

Take the cover off your power valve servo and so you can see if it is working properly and check the cables.