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Post by shreddagnar on Dec 4, 2016 21:06:25 GMT -5
Hello all,
I just bought a 1980 sting to fix up before the snow flies. At first I had no spark so I thought I needed a cdi box but only had to connect some wires and we had ignition. Sled wasn't run for couple years and had a high idle. I took the carb out and cleaned everything. It was filthy with old gas caked on bottom of bowl. The needle that the float arm rests on was a bit sticky so I figured the could be causing high idle. All the jetting was correct for the powerjet 36mm mikuni. Float arm was level. I put the clean carb on, put in good gas and it still idles high right away. Seems like 4500-5000 rpms. We checked for leaks with starting fluid and tried adjusting idle screw, and air screw. I checked the throttle valve and it is going all the way in. I can put my hand over air box and the rpms do go down. This is my first sled so I don't know what else I can try.
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Post by weverat on Dec 4, 2016 22:07:18 GMT -5
Make sure there is enough slack in the cable for the slide to drop all the way down. And then it sounds like you have a lean condition at idle.
Try turning the idle mixture screw all the way in, this will rich en the idle circuit.
Then remove the pilot jet, use a magnify glass and read the jet size, probably a 35, and a bit plugged. I would go up to a 40 or 45. Then you can re adjust the idle screw to wherever it idles the best.
I actually run the idle circuit on the rich side, seams to help eliminate hesitation right off idle.
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Post by 80sting440 on Dec 4, 2016 22:17:35 GMT -5
Hi shred.
I own the same machine as yours.
Try going to the top of your carb and loosen the cable jam nut and turn in the other long nut in a couple of turns...you now have enough cable slack to allow the carb slide to go lower into the bore to lower your idle!...also check the other end of cable at the throttle lever to make sure it's sitting in it properly.
If I were you, I'd go back into the carb and make sure that you correct the sticky needle to prevent fuel level issues.
PS, these engines are known to burn down very easily if the carb is not 100% cleaned out, so if you have any doubt, check everything again.
Rene |
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crosscut
L2 Scorpion - Above All
Posts: 88
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Post by crosscut on Dec 5, 2016 12:11:42 GMT -5
high idle can be a symptom of an air leak
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Post by shreddagnar on Dec 5, 2016 21:00:44 GMT -5
I'm taking the carb off. When I check the throttle slide, it doesn't seem to be going down far enough. I believe I have the wrong length throttle cable. It's set properly in the throttle lever. I can't adjust it any lower. I have a picture I will try to post later. My throttle cable has the numbers "932" stamped on it. I can see the top of needle jet when throttle valve is it's lowest. What is the correct length?
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Post by shreddagnar on Dec 5, 2016 21:14:54 GMT -5
I checked Dennis Kirk. "932" is for 34mm or smaller. I need "933" throttle cable for 36mm-38mm powerjets. I'll have to order one and try it. I'll post an update. Thanks
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Post by 80sting440 on Dec 5, 2016 22:25:17 GMT -5
Good catch there, Shred...that didn't take you long to figure out!
An old snowmobile previously owned by someone else is a good way to learn about them.
Question everything and don't assume anything is currently correct.
Rene
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Post by shreddagnar on Dec 10, 2016 8:26:29 GMT -5
Well, just want to say these threads are nice to search and see what others have done with their sleds. I put the new throttle cable on. I adjusted the little bolt all the way down, all the way up, middle. Slide would not go down. Started sled about 3 times trying to adjust it. Idle was still high. No way! I couldn't figure out if it was twisting, catching, or broken. Really questioning if something was put together wrong. I don't know why but that nut had to be about halfway and locked on the carb top before you tightened it down then the slide would go all the way. Whatever, 6" of snow today and tomorrow so I can finally ride it! The lights aren't working so that will be next. Hopefully just a bad ground (as others have mentioned).
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Post by 80sting440 on Dec 10, 2016 12:04:19 GMT -5
Glad you got it Shred!
When I bought mine this spring, I was just going to ride it as is. Before you know it, I had to rebuild the engine and suspension, repair this and that...7 months later, a complete overhaul and I still don't trust it 100%. It's still an old machine with a few recent updates. As they say, "A chain is only as strong as its' weakest link". Our next task is to figure out those links and correct them before the chain breaks...
I'd wish you luck but you don't need that...you've got it covered.
Keep up the good work!
Rene
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Post by 80sting440 on Dec 10, 2016 12:17:39 GMT -5
Hello Shred.
You're new to this forum. Why don't you tell us a little bit about yourself and your snowmobile passion?
Rene |
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Post by shreddagnar on Dec 10, 2016 16:00:46 GMT -5
A buddy convinced me to get some sleds. He has el tigres. I always thought sleds were loud, stinky, and annoying but I always had fun on them. We saw the sting for sale close by and I thought it was just too nice and clean to pass by. We got it running easy enough and another sled and extra engine popped up for sale close by. 1980 TK and a Rockwell 440. Everything is basically the same so i thought what the hell it can be a parts sled. We looked at it and found it to be really clean as well, only "problem" was the engine was in pieces. So that's the story of my next project and how quickly you can get addicted. I'm keeping an eye out for a sled that needs a motor but that can wait until next year. So what's faster? Scorpion Sting or el tigre 5000.
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Post by 80sting440 on Dec 11, 2016 5:06:44 GMT -5
Keep telling yourself that it's a "passion" instead of an "addiction" and no one will force you into a twelve step recovery program!
My first snowmobile back in '73 and my most recent new ride are both El Tigres, so my vote has to be with the 5000 if both machines are stock.
Rene
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