Great progress! It is looking like a snowmobile again.

Welcome!

No, they did not. The smallest sled they made is the twin cylinder 340 free air Spitfire.

You would be looking for Ski Doo's or late 70's early 80's Yamaha's. They had single cylinder sleds.

Handle Bar heaters and a Tachometer were the other options. The options were not "factory options" They were installed at the dealer. The only factory upgrades from the 80/81 Trailfires were the Cross Country windshield and Oil Injection.

If you want light weight go with the 80-84. The 76-78 are heavy! I had a friend that had a 77 back in the day. We called it the tank! Also, the rear suspension is a lot better on the 80-84 sleds. If you are going with the newer one, try and find an 82-84. They had some updates as well as an updated ...

Nice!! I just got my issue but have not had a chance to flip through it yet. Now I have to get flipping!

Looks Great!!

I looked at the parts book and it shows a bolt, lock washer and a flat washer. The book did not give a bolt size. They should be metric. Also make sure you have the spacer washer that goes over the hole in the case at the 2 o'clock position. If you don't have the shop and parts manual, here is wher...

I looked at the parts book and it shows a bolt, lock washer and a flat washer. The book did not give a bolt size. They should be metric. Also make sure you have the spacer washer that goes over the hole in the case at the 2 o'clock position. If you don't have the shop and parts manual, here is where...

Your making good progress!

Back in the 80's when a Deere was my main sled, I used marine grease that you would use on boat trailer bearings. Now I just use the Ski Doo waterproof suspension grease because that is what is in my snowmobile grease gun. You can still use the boat grease. You should be able to find it at Wal Mart ...

Welcome! I always just pulled them every year, clean off the old grease, and coat them with fresh waterproof grease. Then put them back in. Good thing you are doing this. They are a real pain to get out if they were not greased every year! If not done, then the suspension arm pivots on the bolt that...

Glad you got it figured out!

That does not look right. It should be closer to what the bottom shaft/gear looks like. That is just not enough shaft in the gear. When I had to replace my jackshaft many years ago, I had to add more shims behind the gear. The new shaft was a little longer than the factory one. The big thing is that...

+2 on what Nick said.

Thanks, I did not know that. I just looked at the parts book and see that the part numbers are different between the 80 and 81 serial numbers for the sportfire. I will have to go out and measure the extra tracks that I have. I have both an 80 and 82 cleated track to see how much difference there is.