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Looks like one heck of an ambitious project. As you said it will be worth it. Do you have any history on the sled and motor? Hopefully you will be able to post some pictures along the way.????
 

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Got the engine from a buddy that loves arctic cats & he sold it to me. The sled itself I remember the fellow that had it new as a 640 & remembering drooling over it. Sat for a lot of years & another fellow bought it & was just stored never rode. Third owner is where I got it from and he rebuilt the engine with NOS parts. I know this because we worked together as mechanics back in the day. He rarely ran it because of a bad fuel tank. Took me a couple of years to get him to sell it. Now its up to me to hope to bring back some former glory. Still looking for a tach for this project if someone has one to part with.
 

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My brother stumbled onto a 70 771 engine last year.the owner said it was used to run a waterpump or sae of some kind i cant remember which it was.Crazy
Good luck on the tach hunt.i been hunting for a few years.always eludes me.
 
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