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Post by shreddagnar on Dec 15, 2019 10:26:49 GMT -5
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Post by shreddagnar on Dec 15, 2019 10:23:15 GMT -5
My guess would be the external ignition coil.
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Post by shreddagnar on Dec 9, 2019 22:15:53 GMT -5
Does anyone know how much the fan belt should vibrate while running on a Cuyuna? It looks like its shaking around quite a bit in a new rebuild I just got done. I replaced the fan bearings and installed a new belt. The belt felt slightly loose on install. I've looked at another engine and it's the same thing. Should I remove a washer or two on the top to tighten it up a bit or am I worrying about nothing. How tight is too tight? The new belt felt a little thinner than the old take off. I know the fan is important to not burn down, want to get it right. Thanks for any input.
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Post by shreddagnar on Nov 26, 2019 23:30:29 GMT -5
You can also make a jumper wire to close the ignition system to check for spark. If you still don't have spark your CDI or a coil could be bad. But sometimes it could be something simple like one connection being loose or bad spark plugs.
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Post by shreddagnar on Nov 26, 2019 23:09:23 GMT -5
A stator for the CDI Cuyuna only has two coils and nothing else. No points. There is one external coil connected to the CDI box. When you put it back together make sure the timing marks align. If you have no spark, it could be that the kill switch is faulty. Try bypassing that.
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Post by shreddagnar on Jan 23, 2019 11:10:26 GMT -5
Looks like everyone is tight lipped about clutching. I guess you have to test and tune yourself. Stiffer primary spring should increase engagement rpms. I've heard that changing the helix angle can really help a 102c work on a Cuyuna. Good luck getting someone to share that info. The basic principle is to move that sled in the peak power band using all of the primary and secondary clutches. I haven't yet changed from the Powerthrust 2's myself. I'm still happy trail riding.
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Post by shreddagnar on Jan 3, 2019 18:33:01 GMT -5
Seems pretty slow on here. I hope everyone is getting some snow time in. I have some sleds and they all are set up similar. TK's and Sting that are stock with the air box on and the powerjet carb. Does anyone notice a whirring sound right as you come to stop from a good run? What is that? It seems to slightly increase while your not moving. Is it air/fuel flowing through pilot jet that sounds different when decelerating?
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Post by shreddagnar on Mar 27, 2018 9:42:04 GMT -5
I was taking apart a 66 Olympique that needs some love and it had a Scorpion branded belt on it. I never knew they made belts too. Would there be collector interest in it?
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Post by shreddagnar on Mar 25, 2018 18:43:11 GMT -5
I would maybe post this on the Trail-a-Sled, Scorpion and Brut Snowmobile page on Facebook. That seems to be getting more traffic these days. I'm looking for a late seventies snow flap. Also a 79 TK main wiring harness or a complete Cuyuna 440 engine. Where are you located?
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Post by shreddagnar on Mar 21, 2018 9:55:29 GMT -5
You should state the compression in your listing if you're asking that much. I'd also expect proof that this was totally rebuilt. I think I'll look for whole parts sleds that cost half as much.
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Post by shreddagnar on Mar 5, 2018 9:12:20 GMT -5
What is out there for Cuyuna 440's? I have a complete 79 TK that just needs a power plant. It is too nice of a sled to part out. I am located in SW MN. I am willing to drive a couple of hours.
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Post by shreddagnar on Mar 4, 2018 13:41:54 GMT -5
Then the carb is probably the culprit. I'm not familiar with Walbro's. I only have the Mikuni Powerjets in my sleds. I hope you get it sorted. These sleds are fun.
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Post by shreddagnar on Mar 4, 2018 9:20:53 GMT -5
Are your plugs and caps the non-resistor type? I use B9ES plugs and non resistor caps. I guess it could be the ignition coils also. Do you have a spare carb that you know works good that you could try?
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Post by shreddagnar on Feb 16, 2018 21:47:21 GMT -5
You can see the points through small hole in flywheel. The external coils are interchangeable.
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Post by shreddagnar on Feb 16, 2018 17:59:36 GMT -5
I would switch things from one side to the other until you get spark or the spark changes sides. So swap plugs, check. Swap plug wires, check. Swap coils, check. If after that the spark doesn't change sides the problem would be in the stator.
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Post by shreddagnar on Feb 14, 2018 23:20:59 GMT -5
Alright, turns out my Dial indicator was goofy. I got my Dial working good enough and I set timing to .105 on mag side and .102 on PTO while holding advance all the way. Started up and ran great. No backfire and started easy twice more. The plan is lake ride Saturday. Thanks weverat.
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Post by shreddagnar on Feb 14, 2018 17:08:49 GMT -5
I tried but can only get down to about .130 btdc. I'll check when I try again tonight. Gap was .15. Stator was moved fully clockwise.
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Post by shreddagnar on Feb 14, 2018 9:49:16 GMT -5
I guess it's my turn for a timing question. This is the first time I've attempted to time a Cuyuna. I've read to hold the advance with your finger to fully advance. I do that but can't turn stator far enough to get in spec. I've put a bit in the hole to hold the advance but it doesn't hold it all the way against the inside of flywheel. I can get within spec with a bit in the hole. I've also noticed that if my bit is not in there holding the advance at exactly the same position it makes a big difference. So which is correct; holding it open with finger until it won't move any farther or with a drill bit or timing tool in the hole? This is for a 77 Sting.
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Post by shreddagnar on Feb 5, 2018 14:48:13 GMT -5
The seizing up during your ride and starting after cooling down leads me to believe your ring gap is to small and closing when the rings heat up. That is only my guess and others may chime in with more experience. I'm new to these engines myself. The flooding and the temperature difference could be caused by a timing issue. You may be running on one cylinder. I'm having the same problems with my 77. I ran on one cylinder and could tell because full throttle was only 35-40 mph. I melted the PTO piston. Not good but lesson learned. I would remove your cylinders and set your ring gap to .007-.031 in. I think mine were .013. Then time correctly.
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Post by shreddagnar on Feb 5, 2018 12:24:24 GMT -5
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