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Old 12-19-2007, 08:45 AM   #1 (permalink)
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Tillotson carb

Hi my name is Mark, I have a 76 ski-doo 340. It was rebuilt in the summer. The problem I am having is the only way I can start it is to hold the throttle wide open and when I let go it won't idle. Why won't it idle? How do you set the idle? I've taken the tillotson carb off and cleaned it and taken the low speed screw out and looks good. I've replaced the fuel pump and all the fuel lines. Help me out please.
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Old 12-19-2007, 11:16 AM   #2 (permalink)
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76 ski-doo 340

You guys have any suggestions I'll try just about anything at this point???
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Old 12-19-2007, 11:34 AM   #3 (permalink)
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This is sort of ironic man, I am having the same exact problems. Everything I do with my carb, it seems to give me the same fits on my 72 TNT. I am looking into just converting over to a mikuni carb and getting rid of this time and time again problematic tillotson piece of junk. There is an idle screw adjustment on that, its located by the throttle lever on the carb, just screw that down until you feel as though its reached the right adjustment. Good luck
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Old 12-19-2007, 12:29 PM   #4 (permalink)
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ok

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Originally Posted by 72TNTSkidoo
This is sort of ironic man, I am having the same exact problems. Everything I do with my carb, it seems to give me the same fits on my 72 TNT. I am looking into just converting over to a mikuni carb and getting rid of this time and time again problematic tillotson piece of junk. There is an idle screw adjustment on that, its located by the throttle lever on the carb, just screw that down until you feel as though its reached the right adjustment. Good luck
It's screwed in all the way. Does gas spit out the back of the carb when yours is running?
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Old 12-19-2007, 03:16 PM   #5 (permalink)
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Its deff leaking, I bought a rebuild kit for it, I am pretty sure I need a new needle and seet, maybe you need a rebuild as well man
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Old 12-19-2007, 03:58 PM   #6 (permalink)
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flooded

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Originally Posted by 72TNTSkidoo
Its deff leaking, I bought a rebuild kit for it, I am pretty sure I need a new needle and seet, maybe you need a rebuild as well man
I just took it for a ride and I have to hold it wide open to get it to even move. It doesn't have near the horsepower it should have. I think the needle is stuck up in the carb dumping gas into the clyinders which is flooding it. I'm gonna get a carb kit tomorrow I'll let you know how it goes. Thanks for the help.
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Old 12-19-2007, 05:50 PM   #7 (permalink)
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Check the spark plugs. You fouled one and it's only running on one cylinder. The fouled one will be all wet and oily looking.
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Old 12-20-2007, 03:03 PM   #8 (permalink)
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Originally Posted by 72TNTSkidoo
Its deff leaking, I bought a rebuild kit for it, I am pretty sure I need a new needle and seet, maybe you need a rebuild as well man
I got a rebuild kit and it still won't fire and idle lots of spark but when I pull the plugs out there soaked. Could this be a problem?
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Old 12-20-2007, 03:39 PM   #9 (permalink)
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Sounds like your running rich, what is your premix ratio?
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Old 12-20-2007, 05:05 PM   #10 (permalink)
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40:1. Where are you from? I think I have other problems. Is there suppose to be something in the fuel tank hooked to one of the fuel lines? Both lines are hooked together with a metal piece. Which one sucks and returns? On the carb is the line that sucks fuel hooked to the little hole or the big hole?
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Old 12-20-2007, 06:09 PM   #11 (permalink)
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I live in Maine, this is sort of weird, you have almost identical issues with your carb as I have been having. I just learned the other day from these guy that the you can find out which line is which by carefully sucking on one of the lines at a time, if it begins to bring up fuel, that line goes under the carb, the other one goes on the left side in the tiny hole, other wise known as the "return". I found a used rebuilt Tillotson HD98A 70 miles from me, and I am going to go pick it up tomorrow and see if that solves my problems, theres a chance the rebuild you have wasnt properly installed. Hows your compression on your engine? Have you possibly looked into if your getting spark like Small Engine Guy suggested? If your getting intermittent spark, one of your cylinders would only be running every so often, hence, over time, the plug will foul up because its not cumbusting on that side. I have a feeling that is what your problem is, sounds like lack of spark on one or both of the cylinders...
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Old 12-20-2007, 07:37 PM   #12 (permalink)
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Quote:
Originally Posted by 72TNTSkidoo
I live in Maine, this is sort of weird, you have almost identical issues with your carb as I have been having. I just learned the other day from these guy that the you can find out which line is which by carefully sucking on one of the lines at a time, if it begins to bring up fuel, that line goes under the carb, the other one goes on the left side in the tiny hole, other wise known as the "return". I found a used rebuilt Tillotson HD98A 70 miles from me, and I am going to go pick it up tomorrow and see if that solves my problems, theres a chance the rebuild you have wasnt properly installed. Hows your compression on your engine? Have you possibly looked into if your getting spark like Small Engine Guy suggested? If your getting intermittent spark, one of your cylinders would only be running every so often, hence, over time, the plug will foul up because its not cumbusting on that side. I have a feeling that is what your problem is, sounds like lack of spark on one or both of the cylinders...
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Old 12-20-2007, 10:35 PM   #13 (permalink)
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Weird, mine was too. I think you and I should meet up and just look up at the stars and just ponder to why no matter how much more we put into these things, they just dont seem to care...
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Old 12-21-2007, 08:22 AM   #14 (permalink)
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Originally Posted by 72TNTSkidoo
Weird, mine was too. I think you and I should meet up and just look up at the stars and just ponder to why no matter how much more we put into these things, they just dont seem to care...
Ok this is driving me crazy. Heres where I'm at I still can't start it unless I hold the throttle wide open but then it runs it has lots of power and the plugs look a little tan color. Awesome. I just don't understand why it won't start easy. Theres a push primer on it which sprays fuel into the cylinder and that should want to start it shouldn't it? How many turns out is your low speed screw? I have mine set at 2. Does it wreck the spark plugs when they get wet? I just put a light on them till there dry.
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Old 12-21-2007, 08:24 AM   #15 (permalink)
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I mean lighter
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Old 12-21-2007, 09:24 AM   #16 (permalink)
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Fouled plugs are not worth trying to "repair"!! Can't believe someone will try to save $4 & not know for sure if the plugs are good!! You'll just continue to chase the problem! That just astounds me....JMO!!
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Old 12-21-2007, 12:38 PM   #17 (permalink)
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Old 12-21-2007, 02:29 PM   #18 (permalink)
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Originally Posted by IndianRvrShiver
Fouled plugs are not worth trying to "repair"!! Can't believe someone will try to save $4 & not know for sure if the plugs are good!! You'll just continue to chase the problem! That just astounds me....JMO!!
you know what it was just a question. I'm trying to repair this machine for a buddy of mine so I'd appreciate if you'd keep your smart mouth comments to yourself and have a merry christmas.
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Old 12-21-2007, 03:34 PM   #19 (permalink)
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Originally Posted by mark31
you know what it was just a question. I'm trying to repair this machine for a buddy of mine so I'd appreciate if you'd keep your smart mouth comments to yourself and have a merry christmas.
Try listening a little bit.....if the carb was perfect, the engine WON'T run right with fouled plugs!! Just makes sense to fix the easy/cheap things first!!
Your on a public forum, so you'd better get used to "smart mouth comments" when you post such drivel!! 11 posts!! What is this post of yours trying to prove?? ...how to influence people & build cred??? http://www.snowmobileforum.com/gener...high-elev.html
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Old 12-21-2007, 03:46 PM   #20 (permalink)
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Quote:
Originally Posted by IndianRvrShiver
Try listening a little bit.....if the carb was perfect, the engine WON'T run right with fouled plugs!! Just makes sense to fix the easy/cheap things first!!
Your on a public forum, so you'd better get used to "smart mouth comments" when you post such drivel!! 11 posts!! What is this post of yours trying to prove?? ...how to influence people & build cred??? http://www.snowmobileforum.com/gener...high-elev.html
If I wanted your help I would ask for it. Your name explains your story. So why don't you listen and stop repying.
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