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Old 11-15-2012, 06:51 PM   #1 (permalink)
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What screw to turn?

I have a pair of 05 xcsps's 500's. One of them have a slight idle hang after revving. I want to turn a screw, But for the life of me i can not remember which one.. I don't feel like guessing.

A or B? In or out

Turn A 1/4 turn out?

Thanks in advance.
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Old 11-15-2012, 07:28 PM   #2 (permalink)
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when the idle is "hanging" flip the choke lever
and if idle drops right away the pilot jets are
getting clogged. remove & clean carbs.
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Old 11-15-2012, 09:59 PM   #3 (permalink)
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A is the air screw, turning in will richen the air/fuel (less air)

B is the fuel screw adjuster, out will richen air/fuel (more fuel)

You are lucky, you have both an air screw and a fuel screw. Can't get more confusing than that, huh
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Old 11-16-2012, 05:33 PM   #4 (permalink)
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Thanks Guys. I probably should have noted that i meticulously cleaned the carbs on both sleds. The high idle hang has been present on the one sled since i bought it (had to blip choke) and probably always had it with the previous owner. It only has 1,000 miles on it. Both sets of carbs were spotless, I felt as if i wasted my time. Last winter i turned out the "B" screw and it didn't help much. I didn't realize that i had the "A" screw either and my manual didn't really point to it. I noticed it when i cleaned the carbs. I will give the "A" screw a try. I will turn "A" In , 1/8 of a turn. Put it back together and try it. Don't want to go crazy. Would much rather wait until i can ride and test it at normal temperatures and conditions. But i can somewhat compare it to the other sled on the way it acts. Thanks Again.
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Old 12-27-2012, 08:45 PM   #5 (permalink)
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Thanks again Dan.. Ripped the sled around the yard now that we got some snow. Still hung a bit on high idle.. Turned it (a) screw) another 1/4 turn (in) and whalla.
Rode all today and didn't even remember that i had a high idle problem. SWEET !

That is fixed.. Both sleds ran super except that Sled (b) is terribly cold blooded. Popping, Backfiring, Coughing.. Until she warms up for 10 minutes. Then ran perfect all day.. The carbs were spotless.. Usually i just wait out the time to warm up, But would like to address this issue some day.. It is like the float sticks. But i know it isn't. Did it last year, Cleaned the carbs and still doing it. Thinking fuel pump now or the throttle lever push button sticking? I just read about that.. Runs so dam nice when it is warmed up, It isn't a priority.
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Old 12-27-2012, 09:52 PM   #6 (permalink)
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You might try going in on the air screw on that sled, too. Often, popping and backfiring is caused by a lean condition which is solved by making the air/fuel richer through the pilot jet. If your jets and carbs are clean and you turn the air screw all the way in, and there is no change, you may need the next size pilot jet.
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Old 12-28-2012, 08:46 AM   #7 (permalink)
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Really,, That is a easy try.. I will try that today. Have to clean them off today and re-grease. They were in the garage with the heat on and fans blowing all night. I will give them air screws a turn then load them back up on the trailer.. Thanks Dan.
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Old 12-28-2012, 09:46 AM   #8 (permalink)
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I always try the easy stuff first! Sometimes you get lucky
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Old 12-29-2012, 12:35 AM   #9 (permalink)
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Both identical sleds cleaned, from Thursdays ride. Re-greased
Turned air screw on the cold blooded machine.
Heading out tomorrow morning for another all day ride.. Or is is today.. It is 12:34am. What day is it really, Hey, Who knows, Depends if it is beer time.

Thanks Dan,, Very helpful.. Wish i can treat you to a brew.
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Old 12-29-2012, 10:28 PM   #10 (permalink)
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Bingo Dan. Thanks Again.

Both sleds ran perfect all day... Totally happy with them. Not going to touch a thing now.

500 cc.. Stop for lunch etc.. I put on about 65 miles and i had below a quarter tank.. Both machines, Exact same, and same oil consumption on both sleds. That mechanical gauge lie somewhat? i can't make 100 miles?
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Old 12-29-2012, 10:38 PM   #11 (permalink)
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The bottom half of the tank is bigger than the top half. You should be able to get an honest 10 mpg with that sled and with an 11.8 gallon tank, that should give you close to 120 miles per tank.

Glad it worked for you!
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Old 12-29-2012, 11:10 PM   #12 (permalink)
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ok.. Great thanks.. I will have to get more in touch with my mileage and Gas supply. Do a few fill ups, and some number crunching. Running out of fuel is what keeps me up at night.
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Old 01-02-2013, 08:15 AM   #13 (permalink)
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Ran another 60 miles.. Both sleds ran super.

One sled has always had a, what i think is called, "idle knock" when coming down from higher RPM.. Rev it up, When the RPM drops it will Kick a few times before she seddles into an idle. One sled does it all the time, The other does it rarely. Is this a base timing issue?
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Old 01-02-2013, 09:44 AM   #14 (permalink)
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Probably still just a tad lean in the idle circuit. I would check the PTO crank seal as well. An air leak there will cause a lean condition. With the engine idling, spray some carb cleaner, engine starter, or even WD40 on the seal. If the idle changes, the seal is leaking.
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Old 01-02-2013, 11:12 AM   #15 (permalink)
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Thanks a million
another 1/4 turn. on the air screw (in) Give that a try.
And also i will do PTO crank seal test. I thought i checked that last year, But maybe that was the other sled looking for the high idle issue.

I also checked the TPS.. was at 4.1.. I brought it down to 4.0.. If i pull the wire connector off the TPS, It won't do the "lean knocking" I read this is a pretty common thing with no real solution
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