I have a 2005 Ski Doo GSX 500ss. These come with the 600cc motor. It starts and runs great. It will even idle perfectly. After it is warmed up and you come to a stop, the RPM's like to stay up around 3000. I will wait 5-7 seconds and it will sometimes slowly come back down to normal. If it does not come down, I gently tap the gas and it will come down. Does anyone know why the RPM's are staying up in the first place?
Welcome,Very common on the TM-40's
Air is what seems to be the issue.. and with some tweaking it can be resolved.
Check your carb boots for cracks/rubber rot and y-pipe for cracks 1st.
Some have cured the high idle by turning the fuel screw out another 1/4 turn from the factory 1 1/2 turns out . Any more then 2 turns out and the fuel screw adjustment does nothing.
Some have just changed pilot jets from the stock 17.5's to 20's to cure it also.
Another thing is the design of the tm-40's.
If your any bit happy with the flipper and constantly working the slides it will show up more and sooner then some.
The coating tends to wear off the slides ...and from the slides being so loose it's letting air past by them causing a lean condition ..high idle...even with good coating on the slides their loose from the factory
Kinda crappy finish work on the carb body itself doesn't help matters ...but there is a fix for that too.
But being your only hanging for a few seconds I would try the fuel screw out another 1/4 turn to start. The fix for the bodies would require a total dismantle of the carbs and some time.
I have 2 05 ss 's and one was fixed just by the fuel screw turned out to 1 3/4 turns..but is starting to get worse , the other I had to go with the total carb rebuild and 20 pilots to get it under control...slide wear.. my thumb never stops
This summer I will be pulling both apart and sending the slides out for new coating , that's the one thing in the fix I skipped when I did mine. All because it was mid season and didn't want any down time waiting on them to get back.
Thanks to Mutt and Idooski. It looks like I need to dig into this. I have always been surprised to see ads for similar sleds on CraigsList where they claim to have replaced the carbs. I am not surprised anymore!
Sorry to resurrect an old thread, but this is still a very present topic.
Based on the titles and the recommendation by idooski, it sounds like those linked articles are just what I (and probably a lot of people) will be looking for between seasons to resurrect our worn and wearing Mikuni carbs.
Unfortunately, the links are now broken, as those sites appear to have gone away.
Does anyone have those articles saved that they could furnish, or are you aware of those articles being anywhere else on the web?