rush 800 pro r

[race9696]

after i put an aftermarket silencer, it would cut out on top end until you completely let out of the throttle. Any ideas. The silencer helped a bunch on low and mid range.

 

[fredster]

It's either too lean or one or more sensors exceeded the allowable range so the computer cuts power to save the engine. Have you checked the plugs? I bet they'll show an extreme lean condition. If the low and mid-range are that much improved the exhaust flow is much better resulting in a lean fuel map on the top end.......

 

[polarisdude]

I remember hearing the same symptoms on another thread on this site. Something to do with the type of plug you had in. I believe it was something like the ethanol and no ethanol plug? I almost bought an 800 pro r made the dealer up here in Manitoba an offer.We had a 170 dollar difference. I came up in my offer and they didn't meet me half way. So I said k next year. Funny thing is they still haven't sold that sled when all other dealers were out of 800's by new years haha. This is a 2011 pro r 800 btw.

Anyways back to your scenario. This might be the issue just saying if all else fails. The comment before me makes a good point.

 

[slimcake]

Put the lightweight stock can back on!! Problem solved!!