99 ski doo grand touring carb issues

[jeff127]

Well this fall when I got the sled out it wouldn't idle unless I pumped the primer every few seconds and as I suspected the pilot jets were plugged. It had plenty of power after 3000 rpm but would quickly die out when rpm dropped down. I disassembled both carbs and gave them a good cleaning and reassembled making sure air mixture screws and idle speed screws were set the same as before I started. Now it idles but the left cylinder floods out while idleing and the power is about half of what it was and is extremely boggy with no throttle response. I have taken the carbs off 5 times and rechecked everything and am now baffled on what I did to throw this thing out of whack. The air mix screws are turned out 2 turns and there is no adjustment on pilot and main jets as they are both just tightened down.

Anybody have any clues on where I start???

[Walleyehooker]

Are the floats sliding freely? Sometimes it takes compressed air to clean out small orifices or even a small needle to poke debris out. Ive had a couple times where I had to remove the carb again and reclean it because something wasn't right or cleaned out. Ive seen things in carbs that looked like lint clog things up that you could barely even see to clean.

[jeff127]

Thanks for replying wh, I checked all floats and they seem to be in perfect condition and slide freely. I have completely cleaned each carb several times and triple checked each orifice shooting carb cleaner through them to make sure they are open. I also checked both boots for cracks

[leech~~]

Try:

New set of plugs.

Check for a good spark on both sides.

Do a Compression check.

Check float adjustment on each carb.

Make sure your carbs are in sync.

Fuel flow to each carb.

Also, when running shoot some Gum-Out spray around the boots to see if the motor increases=loose or cracks.

[Surface Tension]

Did you get the slide back in carb(flooded side) correctly?

Yes it is possible to put it in wrong. Look close, wide short groove aligns with the stop screw.

Narrow long grove rides in the pin.

Did you take apart slide and some how put the clip for the jet needle in the wrong location?

Note that normally you don't take that apart unless your replacing parts. Just a cleaning of the jet needle is needed.

[jeff127]

I have checked slides and they are in correctly and are synced. I didn't disassemble slides. No air leaks with no rpm change on spraying carb spray. New plugs. Spark is very strong. Haven't checked compression since It had plenty of upper end power just before i pulled it into garage and cleaned carbs...just no idle. Now it will idle (although sounding like just one cylinder)and has no power. Float looks set as contact arms are parallel to carb when inverted. I'm at a loss and am going to go through them again tonight.

[Scott M]

Can't help you, but I just bought the same make and model and am in New Prague. Added you as a UBB buddy. I'm no gearhead, but its good to talk to somebody that might have gone through the same thing.

Good luck.

[john.wells]

If you are sure the floats are set correctly, I would first suspect the inlet needle sticking or not seating. Also, check to see if there is an inner "buffer" spring in the inlet needle. If it is sticky, your float won't rebound correctly or quickly. Also, there is a possibility that your float could be faulty, and either saturated or filled with fuel. There could be many more possibilities, but I would look at these things first.

[john.wells]

Can't help you, but I just bought the same make and model and am in New Prague. Added you as a UBB buddy. I'm no gearhead, but its good to talk to somebody that might have gone through the same thing.

Good luck.

Hey Scott, I was trying to figure out how to add people as a buddy the other day, got frustrated and tapped out. Can you let me know how to do it?

[jeff127]

hey guys thanks for the replies, I have since got the issue resolved and have been extremely busy and haven't been online. I went through the carbs completely(every piece) again and figured out that the pilot jets had been drilled/gouged out bigger by the previous owner and were too large allowing too much fuel at idle. They were plugged completely when I first cleaned it and once I cleaned them out the flood gates were opened I replaced pilot jets and mains and it runs awesome. Checked the plugs after an hour of riding and they were a nice tan color. I think I have a little bit of air screw tuning too do as It seems to idle a bit rich.

I also put new plugs in and while trying test runs on the way rich carbs the brand new plugs went to h e l l and I had to get another set. The spark was jumping through the ceramic inside the threaded area on both new plugs before getting to the tip to jump the gap. I have never seen new plugs die so fast.

jeff