21 Turbo throttle & rpm issue

[farmboy84]

I bought a '21 Expert turbo last spring with 900 miles on it. I only have 4 days on the snow with it mostly trail riding in the Bighorns with the family, 2 days last spring and 2 this past weekend.

Last spring I noticed several times going from 6000rpm to full throttle it would increase RPM slower than I expected. I thought it was the clutch needing adjustment.

Over summer I replaced the oil pump so I had Big John at SHR prime and calibrate the oil pump and RAVEs. When he was doing that, he also told me the throttle at wide open was 107% and I had no freeplay in the cable. I backed off the adjustment for 1/8" of freeplay. I also bought his clutching. I don't know if any of this plays a part, but FYI.

So now to this past weekend I was playing around with the throttle trying to re-create the condition from the spring and I could. If I'm crusing 6000RPM and go to full throttle, it will climb to 7700RPM in 1-2 seconds and then take another 1-2 seconds to get to 7900-8000RPM. If I start at the same 6000RPM, but go to 3/4 throttle (not squeeze all the way to the bar), it will spool instantly to 8000RPM and I can noticabaly feel it pull much harder.
If I were to put a stop on the bar so the throttle could only go to 3/4 position, the sled would be perfect, running exactly how I expect it to. Any ideas what's going on with full throttle?

 

[spoon]

Was the TPS value reset when you adjusted the cable? Is it pulling full open at WOT? Could be clutching as well because as you ease into it it will shift the belt up and react as it should. Quicker bursts of throttle require the clutching to react as quick and backshift may be your issue. Try playing with the clickers to see if it changes what you are experiencing. May need a clutch kit to get the performance you are expecting.

 

[farmboy84]

Thanks for the response. I have actually had the same thoughts since I posted. My next trip to CO is next month but I plan to have the TPS reset/calibrated, replace and replace the secondary spring as it's the original as far as I know. I do have SHR clutch kit in it so I plan to play around with weights and clickers when I get out next.

 

[farmboy84]

I'm in CO now and the problem persists. If I constantly vary the throttle it will Rev up to 8000 but if I'm cruising in a meadow and go full throttle it will Rev to 7700 and slowly climb. My next guess is the rave solenoid but it's just a guess.