2013 pro RMK 800 with low end issue

[MCB PERFORMANCE]

Got a '13 Pro RMK 800. Between 5400 and 5800 RPM's the motor is flat and sputters with no throttle response. It acts like it is lacking fuel and actually dropping a cylinder. So far we have changed ou the TPS sensor, changed out the DET sensor, three new re-flashes. Once the RPM's are above 6000 it runs great. Any ideas?

Matt @ MCB www.mcbperformance.com

 

[live2beel]

Does it have the stock silencer? Everything stock?

 

[geo]

Is it the same with either fuel mode? Easy check on the hill.

I always ran mine on ethanol mode (with 91 non in sled) when stock. Just ran stronger there.

 

[doudea]

I am experiencing the same issues on my wife’s 2011 bone stock 800 pro. It has run trouble free for the last 2 seasons (750 miles), but it started doing the same described flat spot in the mid-range. I have cleaned the power valves, gone through the intake system, drained the fuel and put fresh in. It does seem to be better with the non-ethanol plug in, but still does it. I’m going to go through the clutches to see if something is binding up there? I’m starting to be at a loss of where to go from here?

 

[trikerider]

Had similar problem, adjusted my throttle cable and it went away. Need very little play between the throttle block and the trigger. The adjuster is right in front of the bars.

 

[tinkerjohnson]

Pro

Try new spark plugs and boots sounds like your dropping a plug