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Old 12-21-2011, 05:17 PM   #1 (permalink)
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Carb boot wasnt on correctly, now engine wont stay running.

Hey, i have a 98' Ski Doo Formula Sl and a few days ago after putting the carbs back on from cleaning i tried running the sled. It started well at first then died so i checked the carbs and realized on one, the boot on the engine side (opposite the air box) wasnt on all the way and air was leaking. I put it on all the way and went to run it but it kept dying. I cant figure out if some gaskets blew and theres leaking air but it just wont run. Could damage have been done that quickly or is it a different problem like fuel deficiency?

Thanks,
Sam
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Old 12-21-2011, 07:31 PM   #2 (permalink)
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Yes, fuel. Shut off valve maybe? Prime the carbs with a squirt bottle and some pre-mix.
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Old 12-21-2011, 08:22 PM   #3 (permalink)
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Do I just put the gas into the main diaphragm of the carb?
I dont think there is a shut off. But if the carbs arent getting fuel should i replace the fuel pump and tube?
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Old 12-21-2011, 09:27 PM   #4 (permalink)
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Don't start with the fuel pump! Start with new lines, including the pick-up in the tank. Also, spray starting fluid wherever you think there might be an air leak. If the RPMs increase, then you have found a leak.
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Old 12-21-2011, 09:43 PM   #5 (permalink)
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Alright thanks man.
Do the lines break in half? Or just split a little and suck air instead of gas?
and where are some places I should spray? (I've heard before that you should use something lubricated like wd40 to find leaks as its lubricated and starter fluid isnt. It doesnt do hardly any damage but isnt good.)
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Old 12-21-2011, 09:54 PM   #6 (permalink)
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The lubrication is only needed when sprayed directly in the cylinder. In this case you don't want a large amount of lubrication, as it will leave a residue. And considering you spraying this where it could splash... well, it's self explanatory. If you end up needing to start it, use mixed gas as it won't fire on WD and I have seized up two strokes with starting fluid, even though it said "upper cylinder lubricant". After WD-40 that leaf blower still runs...

Fuel lines don't necessarily crack or break off, although I have had lines that are more like plastic than rubber an actually crack off. Normally, they get dry rot and tear easily. think of a rubber band left in the sun... it doesn't last too long.
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Old 12-21-2011, 10:00 PM   #7 (permalink)
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Ok i get it now. haha thanks.
so i just drop some mixed gas on the into the diaphragm of the carb that connects to the airbox no prime it?
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Old 12-21-2011, 10:11 PM   #8 (permalink)
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Yep, only save the mixed gas to prime it, if desired. Mixed gas will make a mess, spray starting fluid or carb cleaner, is the only good way to do it. Check the boot between the engine and the carb, intake manifold/reed gaskets. And the PTO side crank seal. To get at the crank seal, just spray behind the clutch.
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Old 12-21-2011, 10:41 PM   #9 (permalink)
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If my engine wont idle how do I test for air leaks though? I guess i'll just have to solve the fuel problem first then solve the leak problem if there is one.
Thanks again.
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Old 12-21-2011, 10:59 PM   #10 (permalink)
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reclean the carbs if it was sitting you probably sucked more crud into em
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Old 12-21-2011, 11:52 PM   #11 (permalink)
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Alright thanks man. I'll get back to you all when I hopefully go mess with the sled tomorrow. Too bad im not one off them spoiled adults that has their own heated garage, I get to do this on a trailer outside
(at least theres no snow) haha kidding.
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Old 12-22-2011, 06:10 AM   #12 (permalink)
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Get a windex bottle with 2 stroke mix in it. If the sled won't start, spray the mix into the carb throats and see if it'll run then. If it does, it's not getting fuel. While it's running, remove the fuel line from each carb and see if fuel is shooting out of the lines. If it is, the pump is OK. It's a nissue with the carbs at that point. Don't overanalyze this thing. Crank seals won't cause the issue you are having unless they are way bad.
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Old 12-22-2011, 10:02 PM   #13 (permalink)
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Alright I primed the carbs and got fuel to them, the gas in the lines just evaporated and needed to run to reflow them. But the engine still doesnt run well. It wont idle and even getting on the throttle doesnt keep it running. Changed the plugs and it ran a little better but im not sure what else to look for? Any ideas?
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Old 12-23-2011, 01:05 AM   #14 (permalink)
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If it won't idle but will run past 1/4 throttle then the pilot jet is clogged.
Since the gas evaporated in the lines, it probably did as well in the bowls.
Clean the carbs!
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Old 12-23-2011, 09:01 AM   #15 (permalink)
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I just cleaned them though, that's why I was reluctant to clean them.
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Old 12-23-2011, 09:51 AM   #16 (permalink)
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Air screw will mess up your idle too. Set it to spec. Unfortunately, I don't know what "spec" is for your sled. SEG????
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Old 12-23-2011, 11:27 AM   #17 (permalink)
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Hey thanks everyone I got it running. Last night I primed the carbs, switched them around and it just wouldnt run properly. I went out this morning and it started first pull and idled perfecty. No problems with throttle either. I have no idea what it was but it runs now so it's all good.
Thanks again everyone! (now we just need some snow)
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