Sticky throttle

[Mcatcrazy]

2018 Mcat not returning to idle once warm. It is 100% heat related as it works perfect when cold. Removed the hood and manually checked the throttle bodies - good spring pressure and all seems fine. Everything perfect when cold. Once good and hot it gets stuck at 2300-2400 rpm instead of returning to idle rpm (1600-1700?? Guessing). To get it back to idle I have to blip the throttle a couple time really short and quick and it usually drops. At that point I can feel the resistance for the first 1/16 of the throttle. I am sure it has to be something inside the cable. Dealer said they haven't seen this before and called Cat and no such reports on anything similar.

Any thoughts?

 

[summ8rmk]

"Good and hot" what temperature is the engine? What is the pipe temp? Intake temp?
If there is resistance from the cable, i would replace it or have the dealer replace it.

Mountain Cat

 

[kidwoo]

Check the cable housing right at the throttle end. I had a cable start to pull the housing out of the little crimped aluminum end. Mine would do the same thing after riding for a bit.

Turns out it a handlebar bag I was using was pinching the throttle cable when I'd have the bars turned all the way and the housing worked its way out of the crimped end a little bit. Since you mentioned feeling the resistance in the cable it sounds like it might be something similar.

 

[jim]

Been there, done that. And a big safety concern.

First thing I usually look at is the simple stuff...make sure no damage or fraying at the throttle block. Then check at throttle bodies. If nothing obvious, I usually disconnect both ends and slide back and forth full range and check for smoothness. If that is OK, I connect to throttle and have someone pull back at throttle body. If that is OK, I connect to throttle body and pull by hand at the top.

Lastly, check the throttle body actuation by hand and make sure smooth there.

Usually you will find a fray or that is hangs up. Sometimes you can't see the fray. Rarely it is from the throttle body itself.

 

[rkm]

For whatever reason, the retainer for the cable on the 18s is much tougher than the old ones to seat properly. Where the cable slides through the throttle block is a spring-loaded ball type retainer. Something to at least check. The sheath should not easily pull back out of the throttle block.