600 SDI part-time hanging idle

russholio

Well-known member
Here's the story:

I have an '05 600 SDI with 8300 miles. When I'm out riding (not when the sled is sitting on a stand running) the idle will often (not every time) hang at around 2500 rpm when I come to a stop. It will eventually come down, taking anywhere from 10-30 seconds to do so. I didn't have time to delve into it, so I took it to the dealer. They said my belt was too tight and adjusted it, but it has made no difference. Otherwise, runs fine.

Compression is good (145-150), Boyesen Rage Cages installed last year, no cracks in the Y-pipe that I can detect, Nord-locks on the Y-pipe bolts, clutches taken apart/cleaned/new springs this summer, plugs appear to be the right color, goes into reverse with no stalling. I tried to do a leakdown test this past summer but could not for the life of me get the intakes on the Boyesens to seal properly. I tried a variety of different plumbing appliances to no avail. I should say too, it did this in the past, prior to installing the Boyesens, but somehow healed itself.

Could this in fact be caused by a belt that is too tight? Could it be caused by dirty RAVE valves (one thing I didn't do was take them apart and clean them -- last time I did it they were so clean it was a waste of time taking them apart). Faulty TPS?

Any help and advice appreciated. I'd like to avoid another trip to the dealer if I can!
 

pman

New member
Do a search here, we just covered this on a 500ss idle. This is very common with these motors, and considered "normal". It is a lean condition at idle, nothing to do with the belt. My 06 500ss does this, and I am gonna change the pilot jets from 17.5 to 20 to help it out, and richen-up the mid-range a touch. Also, do a search on doo-talk, you will find tons of info, also info on the rage cage with these motors.
 

russholio

Well-known member
It's SDI, so there's not much I can do about rich/lean (maybe the dealer can by hooking it up to the BUDS, I don't know). I also posted it yesterday on DooTalk, no responses yet.
 

russholio

Well-known member
I would think if it were normal, it would do it every time, and it doesn't. Also, the time for it to return to idle varies, anywhere from 10 seconds to 30 seconds. Doesn't seem normal to me.
 

jprdave

New member
Do a search here, we just covered this on a 500ss idle. This is very common with these motors, and considered "normal". It is a lean condition at idle, nothing to do with the belt. My 06 500ss does this, and I am gonna change the pilot jets from 17.5 to 20 to help it out, and richen-up the mid-range a touch. Also, do a search on doo-talk, you will find tons of info, also info on the rage cage with these motors.

500ss is carbed, sdi is Semi-direct injection. Sdi is tho old HO motor that replaced the older 600 which they now call the 500ss. On my 600 SDI the idle will sometimes be slightly higher when the engine gets hot, not sure if this is coincidence or if the programming does this? As for the belt, if it is that tight that it would effect idle, it would be the opposite, the drag from the belt on the primary would slow the idle. You would most likely be having belt issues if this was the case.
 
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