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Post by 80sting440 on May 30, 2016 16:28:24 GMT -5
Those 6 nuts on top only hold the head on, you can take those on and off as much as you want. The cylinder studs and nuts stick out the bottom, and they hold the cases together. The cylinder base gaskets tend to leak, so you have to keep the nuts tight. Ohhhhhh! I'll check that out as I've already removed the engine but still have it on the engine plate. I'll snug them up tomorrow.
I've cleaned and inspected the bulkhead area and all is good with no stress cracks.
The secondary clutch has no slider cam shoe thingees, I'll need some new ones.
The pan has a 2 inch hole with 2 cracks, one about 5 inches long. I can plastic weld the cracks, use a hole saw to make a nice 2.5 in circular hole and go from there. Either weld in a round patch or fabricate an aluminium one or something along that line. I can always keep an eye out at swap meets for a better pan for future installment.
Any and all suggestions are welcome.
Thanks weverat, you and others here are being very helpful.
Rene aka 80sting440
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Post by oldscorpman on May 30, 2016 20:25:26 GMT -5
OLDSCORPMAN i have tried that line. She say it would be cheeper for me to hang out in the tavern! yes tom for you that wont work, i dont have a 12 sled race team to keep running. i just have a few rusty trail sleds. rick
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Post by 80sting440 on May 31, 2016 23:48:08 GMT -5
weverat.
I checked the cylinder stud nuts and found the pto side ones torqued at around 6-8 lbs! The mag side were a little loose but that pto side...WOW.
Some seemed tight at first check but they were simply rusted solid. Once the rust broke I was surprised at how little down force they actually had.
Thanks again for your help (I'll have to buy you and the guys coffee at the next Scorpion Homecoming).
Rene
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Post by weverat on Jun 1, 2016 15:36:52 GMT -5
I am glad that worked out for you. Do you have the duct work for that sled? It should have a cold air intake to the fan, and something exhausting the air out from under the hood.
And of course use B9 plugs.
Does your Sting still have the electronic ignition?
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Post by 80sting440 on Jun 1, 2016 18:40:03 GMT -5
I am glad that worked out for you. Do you have the duct work for that sled? It should have a cold air intake to the fan, and something exhausting the air out from under the hood. And of course use B9 plugs. Does your Sting still have the electronic ignition? Yes, I've got all of that duct work and some kind of aluminium cabin thing surrounding the carb...whaaaat? That's like first putting a roast into a covered pot inside the oven and expecting it to not cook...(in my humble opinion, of course). I want to somehow wrap the pipe to eliminate some of that under hood heat.
It came with B9 plugs (one colder than factory to prevent meltdowns).
Yes it has cdi. The previous owner installed a newer and better version along with a flow through mag side head, a nos track and a newer mud flap...all good stuff! It was a pleasure meeting and dealing with him. It'll be nice to see him again at the Scorpion reunion providing he goes again this year.
Rene
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Post by Deleted on Jun 1, 2016 18:50:51 GMT -5
I'm just down the road,in Wahpeton,ND. If you are ever in the area,stop in.I'm sure we can find something to talk about.
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Post by 80sting440 on Jun 1, 2016 19:56:16 GMT -5
I'm just down the road,in Wahpeton,ND. If you are ever in the area,stop in.I'm sure we can find something to talk about. Sounds like a plan.
I just googled your town and it said you have a population of 7,899.
If only Fred hadn't left his wife for the mistress in Fargo, you could have reached 7,900!
I've swung by close to your town either down the I29 west of you or your state #2 highway just north!
Maybe next time I'll get it right and take the 75 south...
Your northern neighbour only 4.5 hours away,
Rene
ps. maybe we can gossip about Fred's mistress
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Post by Deleted on Jun 1, 2016 20:02:04 GMT -5
ps. maybe we can gossip about Fred's mistress Bring some pics,more interesting that way. Yup,75 takes you to northside of Breck,we are maybe 5 miles west.
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Post by 80sting440 on Jun 1, 2016 20:08:56 GMT -5
ps. maybe we can gossip about Fred's mistress Bring some pics,more interesting that way. Yup,75 takes you to northside of Breck,we are maybe 5 miles west. Sorry, I don't have pictures of Fred!
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Post by admin on Jun 3, 2016 19:22:05 GMT -5
I'm currently in denial about this whole vintage sled disease...nope, not me...that's all you OTHER guys...nope, not me...
80sting440
Welcome 80sting440. The vintage sled disease is real and very contagious. I have it, I started out with my 75 whip, and now I got 6 old scorpions in my garage. Engines all over the place. hey there is way worse things you can be addicted to.
Welcome aboard 80sting440,
I know this guy who is addicted to Scorpions. He took a day off to go on a day trip with the family. The family thought it would get the guy away from working on Scorpions 24x7. I know this had to be hard for the guy to walk away from his Scorpions for a day.
It turns out though..., Scorpions are also addicted to him, scorpionsleds.proboards.com/thread/1292/scorpion-paul-bunyan-land
Be careful out there.
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Post by weverat on Jun 3, 2016 20:51:16 GMT -5
"Yes it has cdi. The previous owner installed a newer and better version"
I am interested to find out what they found that was better, and or available? The cdi box, flywheel, and stator seem to be typical to the 80 sting only. When they go bad we normally switch out for points, as the parts are obsolete.
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Post by 80sting440 on Jun 3, 2016 21:48:38 GMT -5
"Yes it has cdi. The previous owner installed a newer and better version" I am interested to find out what they found that was better, and or available? The cdi box, flywheel, and stator seem to be typical to the 80 sting only. When they go bad we normally switch out for points, as the parts are obsolete. He told me that the original one was toast and the replacement ones are known to hold up better.
I'll shoot him an email and ask him for the info.
Give me a few days as he works long hours and may not get back to me right away.
I also cleaned up the intake and sealed it up with some 2 cycle crankcase sealant...good stuff. Permatex Moto Seal 1.
Rene
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Post by 80sting440 on Jun 3, 2016 22:00:55 GMT -5
admin wrote: "Welcome aboard 80sting440,"
Thanks for the warm welcome admin.
You have a nice group of guys and gals(?) here with a lot of knowledge of Scorpions and are quick to offer help.
I hope to do the same some day.
Rene aka 80sting440
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Post by weverat on Jun 4, 2016 20:03:49 GMT -5
Yes, it looks like an aftermarket cdi box. I do the exact same thing to my intake carb adapters. Glue the gaskets, and brush on a sealer all the around.
Also, I use the Mikuni brand carb boot, they seem to be less apt to leak
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Post by 80sting440 on Jun 7, 2016 10:15:06 GMT -5
Yes, it looks like an aftermarket cdi box. I do the exact same thing to my intake carb adapters. Glue the gaskets, and brush on a sealer all the around. Also, I use the Mikuni brand carb boot, they seem to be less apt to leak weverat, here's where the cdi was purchased. Zerkel Enterprise Rodger at 618-584-3567. $100 shipped to USA
You may want to ask if it's designed for the light aircrafts which have a milder tuned cuyuna engine...less compression and smaller carb . The timing curve needs may be unique to air flight needs? If so, could you please pass on that info back to us (me).
The ball is now in your court.
Thanks, Rene
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Post by 80sting440 on Jun 8, 2016 19:23:14 GMT -5
It starts first pull and runs very nicely. I'm on the fence on whether I should take it apart and give it a full checkup and reseal it, including centre crank seal or do a minor check by removing cylinders and inspect, or just remove intake and exhaust manifolds and take a look?
What are your opinions ?
Well...after wiggling the pistons back and forth through the exhaust ports I've decided that there's way too much piston play. The mag side piston skirt bottom lost .015" from wear due to engine previously being rusted tight. There's a big patch of rust at the bottom of cylinder. The pto side has ring rust marks on upper cylinder. New piston set is needed. I'll determine if it needs to be bored over once I give it a light hone and re measure . I'll take the crank out to check bearings and replace seals. I'll let our local crank shop handle centre seal duties and centre bearings if required.
I went to remove the four bolts holding the fan housing and got three out but one had an allen key piece peened into place. I chiseled those away and tried to drill it out but it's too hard. I tried turning out the bolt with chisel and hammer but no success.
Have you guys seen this before and if so...any Ideas?
Rene
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Post by weverat on Jun 8, 2016 21:08:32 GMT -5
Yes, those fan shroud bolts are always stuck, often we drill the head off, and use new bolts. But I have been able to pound on the bolts with a flat ended punch. Lots of little hits, and a couple big ones + a little heat and they turn right out.
But with just an allen head socket they are to tight. You have to add a little magic!
We get the new bolts from a donor motor, otherwise Zerkel Enterprise will have them (the guy you got the cdi box fom)
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Post by 80sting440 on Jun 8, 2016 22:42:44 GMT -5
Yes, those fan shroud bolts are always stuck, often we drill the head off, and use new bolts. But I have been able to pound on the bolts with a flat ended punch. Lots of little hits, and a couple big ones + a little heat and they turn right out. But with just an allen head socket they are to tight. You have add a little magic! We get the new bolts from a donor motor, otherwise Zerkel Enterprise will have them (the guy you got the cdi box fom)
Thanks wererat. I ended up tack welding a bolt onto it.
I turned it right away afterwards when still hot and got it.
Thanks for letting me know where to get some.
Rene
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Post by 80sting440 on Jun 10, 2016 15:49:28 GMT -5
"Life's like a box of chocolates, you never know what you're gonna git."
Look at this nasty bite mark I found, right under the mag side seal! Someone was a bad boy. No box 'o chocolates for him! I was able to clean it up good enough to put back into service. I'm glad that I decided to check things out. I also found one of the centre seal springs had come off...I reinstalled it for now. The seal itself is not cracked or brittle and is... somewhat snug...ish? I'll ask our crankshaft guy for his opinion. He won't recommend replacement for nothing. Also the pto bearing is a little rough...we'll see.
I also found the cylinders have .005" wear and can see they are out of round...needs a rebore with oversize pistons.
Rene
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Post by weverat on Jun 10, 2016 17:29:23 GMT -5
I thought it was an un touched low mileage engine? Good thing you took it apart, it would have burned down for sure.
Do you still have snow up there?
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