Blizzard 797, TNT 640, Oly 277 fix and test 

Alllll triples sounds are sexy as hell

I did not grow up with them myself but somehow am really attracted to the 60s and early 70s stuff, there's just something about having an engine right in your lap.

Pretty much sums up the vintage sled life ;)

Don't forgetspare plugs and wrench!

That's nice to hear that I had a hand in bringing back memories, I hope they were good ones ;)

Only the TNT has bogies but honestly bogies are probably better than the slide suspension on the Blizzard ;) it's a real piece of work that suspension. And I have to admit I did add dampers to the Oly skis, made it so much easier to handle.

Thank you! :)

Still plenty of snow but it's disappearing quickly now! I'm hoping for at least one more weekend :)

Luckily don't mind really :) the nearest real neighbor is about a quarter mile away, most of the houses here are cottages and are mostly empty :) One of the neighbors sometimes comes out to watch when I'm making noise, he loves it!

@@Hollaendaren That's the place to live! I used to live in an area like that in northern Minnesota. (crowded in summer, but all to myself in winter) Had to move south for family....I miss snowmobiles and ice fishing... :o(

@@guerrillaradio9953 gotta love the middle of nowhere! I'm not planning on moving anytime soon :)

When snowmobiles were snowmobiles. Remember 71 Blizzard's 797s racing in USSA. Those days are gone. Sad.

Yes ether is a big no no in a two stroke

@@darinmckillop6196 says who? Maybe in the 1950’s but modern is fine and has oil mixed in for the top end. Wives tales lol

Adam Brown So am I! :) Might be a while before I have anything summery to show though, I have some boring stuff that needs to be done first like service my dirtbike and stuff like that. But hopefully one or two more snowmobile videos before the season is really over :)

Thanks for following along :) They weren't great but I didn't want to start messing with the jetting in this warm weather. Hopefully I'll get a proper test ride done with the Blizzard next weekend! I'd like to get down on the river with it so I can open it up a little, but I'm most likely going to get stuck on my way there (even if it's right in front of the house) so not sure I want to attempt that.

I'm not sure what a unifolie is ;) but I love my Blizzard, it's my #1 dream sled and I still can't believe I actually own it. The carb is dancing controllably now at least like a normal one lunger :) it was maybe a bit hard to tell from the video but the oly got no traction at all when I got on the throttle, it has maybe 5 mm lugs but 200+ ice picks. It felt like it was connected to a rubber band, on the throttle nothing happened but when I let go it found some grip and moved :)

Unifolié is the french name of the Maple Leaf (Canadian flag)! It's a nice homage to the sled's origins ;) It's hard to believe there's a Blizzard living in Sweden too, you're a very very lucky man! Did you import it from Canada or USA, or was it a Swedish race sled back in the days? Seeing the leaf springs jump around when you rev it on the stand gives just an idea of how powerful that 797 must be!

Ahh I see! I bought it from Canada (Calgary) but it was originally from the US, but probably raced a lot in Canada too. Until around 2011 it was in Vermont. The springs have probably seen better days ;) but yeah the 797 is quite a power house compared to the 640 fanner. And it delivers instantly when you touch the throttle, unless the track is ratcheting of course, then it only delivers if there's a ditch to go down in, haha! :) I wasn't really expecting it to have traction and jump forward like that.

BTW, maybe it's visible somewhere in the video, on the other side of the windshield there's a US flag. Those stickers have been on there for at least 44 years :)

I will try to get them out on the river while ice is good next winter, unfortunately it was too sketchy already when I filmed this.

Thanks! Yeah the Blizzard is bad ass, it's my number one bucket list sled and I still have a hard time believing I actually have one. The 640 is a 71 yeah. It looks like it did endurance races back in the day judging by the Swedish racing ski loops (they were mandatory) and the twist throttle was a popular mod over here for long distance racing. The pipes are Dougs pipes I think for a 72, one of them just barely touches the hood right at the air vent that 72s don't have. Really should get that dual carb setup on it some day! Take care of that Oly, if it's been sitting for that long and still turns over that sounds like it definitely has potential! Olys in stock form make really nice cruisers I think.

The TNT was not a Granny sled. The elan was a granny sled. Figure that one out😅

It's a 32 mm full block 121“ track. The Blizzard has a lot more space in the tunnel than an Oly :) I have regular 9 teeth 2.52 drivers on it now with a custom shaft. But on an Olympic you can fit at least 7/8" lugs if you use 7 cog 2.52 drivers, for higher lugs you probably need 6 teeth drivers or move the drive shaft down and away from the tank a bit. I used to have a 7/8" track on the Oly before I switched to an ice track. All the traction you need on an Oly really, at least if you're not in deep powder.

​@@Hollaendaren... Hello, great video! What is the top speed on the triple cylinder Blizzard?

@@90daysinvegas53 honestly don't know, I've had it up to around 130 km/h or 80 mph. Clutching is a problem with these old clutches, I've clutched it to take off pretty good but top speed suffers because of that, I'm pretty sure the primary clutch doesn't compress all the way with the spring I'm using.

The previous owner did. Originally the sled came from St Albans, VT.

I don't think the 71 is a racing number from back in the day. Your 797 is a 1971 model year. I believe that is what the 71 number on the sled designates. The 640 tnt is also a 1971 model year, if the 797 was owned by the same person, he probably put the 64 number on it to designate it being a 640 tnt, because 71 is already on the 797. Take good care of that 797, they are worth quite a few $ now.

@@jessbottom9580 I know what kind of sleds they are and I know what the numbers mean but good analysis ;) They did not come from the same previous owner, I imported the 797 from Canada and the 640 was hidden in a barn in northern Sweden. The previous owner put the 71 on it, I put the 64 on the TNT myself.

Jag tror egentligen att den pumpar så det räcker nu, det rann soppa ur gasaren efter 2 drag när jag hade översta membran/packning i fel ordning. Men det kanske är nåt annat fel istället. Jag hade hoppats på köra ner den på älven och bara hålla stumt för att testa, men svårt att ta sig dit just nu med en veteran iaf :/

Lät nästan att den gick lite fett/fyrtaktade......nålventilen som kärvar å har sig månne...

Det var nog lågfarten som var lite fet, jag kunde ju inte hålla så mycket gas utan att dräpa mig där i skogen :) den är svår att justera i farten. Bestyckningen blev helt annars jämfört med innan så jag tror att det har gjort skillnad att byta membranen men behöver en bättre teststräcka bara där det går att hålla stumt längre än en sekund. Skulle egentligen ha kört några gånger till men jag var stressad för jag skulle iväg lite senare och det fanns 2 maskiner till som skulle köras så det fick duga såhär tills vidare. Men jag ska se om jag inte kan fixa ett spår ner till älven, ca en meter hög plogvall nu som jag inte tror jag tar mig över med dom här.

And for seven of those years it's only had 2 of 3 clutch pucks

It was quite an undertaking to be honest but so worth it, the extra traction can't be compared to even the best 114 tracks. I'm pretty sure I used 9 teeth 2.52 drivers, whatever size gives the same diameter as the stock drivers. They are on a hex driveshaft from some widetrack machine and machined to the correct length for the 797 tunnel. Drilled new mounting holes in the aluminum profiles that sit up in the tunnel, to move the suspension back a bit, can't remember the exact offset. I use the stock rear axle but modified plates off a TNT with the sliding brackets a lot closer to the pivot point. I lost almost all travel in the rear axle but honestly can't tell much of a difference. The rear springs sit just inside the track now right next to the rear idlers and are a real pain in the ass to mount because it's a very tight fit, but once they're in it's not too bad to loosen them a turn or so while adjusting tension. I had to cut about half an inch off each side of the track for clearance at the rear of the tunnel so the track is about 13" wide now. It's been working out great, after being frustrated about literally never getting any traction with it that's no longer an issue. And best of all is I didn't have to ruin anything so its a reversible mod. If you want to put back the stock setup the only evidence it was ever modded are a couple of extra holes in the aluminum profiles and those are well hidden inside the tunnel so not visible to anyone. I've just built my first suspension from scratch last year, haven't tested it yet but if it works out I may build one for the 797 too because the stock suspension isn't doing it any favors. But I like the fact that I could keep it original :)

All 3 have no mufflers :) The Blizzard has its original pipes. The TNT has Dougs aftermarket pipes from back in the day, and the Oly has a custom pipe.

Yeah those spindles aren't the strongest. This 640 also had spreaders, and bent spindles.. I replaced the spindles because the splines were bad too and got rid of the spreaders.

Sorry for the late reply, it has a 45.5 (bored 44) with 3.2 mm main jet. Had to drill my own jet, this is about a 1200 jet in Mikuni sizes. Running on E85 it wants tons of fuel. I'm going to try and taper bore a 44 this winter, that should give me almost the same flow but hopefully smaller jets.

Hi, it's a newer 121 track with 32 mm lugs. Making it fit without destroying anything wasn't an easy task! I moved the entire skid back a bit by adding new holes in the top aluminum plates on it (so no new holes in the tunnel). Custom rear axle plates, custom drive shaft, custom slides as the skid is really a bit too wide for these tracks but with some really narrow slides it just barely works. It's all reversible to stock if I want to. The difference in traction is immeasurable!

wow!!! can you writte me brand f track and number? 2.52 pitch? what kind of driver did u use in front and rear?

@@plsextremsport I think it is a Polaris track. 32 mm full block. But any 121" track should fit the same I think. Yes 2.52 pitch, I can't remember right now if I used 8 or 9 teeth drivers. Stock rear idlers.

camoplast durasport 1000?

@@plsextremsport the worst part about the whole thing is the rear spring setup. I had to cut the track (make it narrower) because the spring ends up inside the track with this setup because the rear axle is so far back. That was a real headache!

AuMechanic Yep! Keeping it oldschool. This is the stock carb for this engine. The 797 has 3 Tillys.

They are great carbs. Alex should try one if he can, might be better the have the pressure feed than gravity.

Yeah I think they're great too. But not everyone's cup of tea, a lot of people replace them with Mikunis. But good for me, that means they are selling their old carbs and I can add them to my hoard ;) A Tillotson would definitely solve the fountain problem.

They are pretty small, and don't work very well. They're from 1971 and I want to keep the sled as it was raced back then so not going to change them :)

I have a copy of 100% engine like on your TNT 640. If interested, my e-mail: vvm75@mail.ru

797

They made a 669 too

Probably a bit of a mixture of Dutch and Swedish :)

Exactly! Thanks :)

A little starter fluid doesn't hurt anything. There's so much oil left in there from previous running it's got all the oil it needs until it pumps fresh fuel with fresh oil :)

@@Hollaendaren I disagree but you do what you want with your sleds

The big question is why do you have sleds in the Florida swamps, watercross?

@@Hollaendaren because I was born and raised in Ontario. My job brought me down here. I still watch every Leaf game. Even the Polaris tripples didnt have the sound of the blizzard. Our first Skidoo was the 10 hp olympique in around 1963. I ran that till I got my TNT 440. My dad kept it and bought a 68 super 370 olympique. Fast when it ran. But was unreliable as hell. Bombardier was slow to incorporate the use of Mikuni carbs and stayed too long with the center mounted engine which hurt them in the end. In 1974 they came out with the front mounted engine chassis. The TNT free air cooled engine was pretty nice. I never owned one but I never heard anything bad. Tiloston carbs were ok as a single carb. 2 were a pain 3 were a nightmare. I actually had a small vacuum guage that I used to tune them. I miss snowmobiling.... but we got airboats down here!!! LOL

You're completely right :) As a true racer I have my excuses ready though! Here goes... I think I did go wide open on the one lunger but it never got any traction in soft snow with my ice track (no lugs just ice studs) so nothing really happened.. I almost crashed the Blizzard with just a blip of the throttle so I think that was enough ;) And the TNT has the twist throttle which is awkward as hell on a sled especially when things get bumpy, but that's how this one was raced back in the day so it's staying :) I actually went to an 18 km enduro race with it and honestly I should probably be glad the rear axle broke after 2 km and I couldn't continue, I'd either have crashed because of the twist throttle or I'd have completed it and had sore muscles for weeks ;)

@@Hollaendaren well I'll tell you what there's no question all three of them sounded screaming mean! They sounded awesome. I have to admit though I've never liked the thumb control throttle on anyting. I much prefer the twist throttle as you have on the one. My thumb tends to get tired it starts to hurt way before I'm ready to quit riding. Either way thanks for the response I appreciate it. Obviously I'm in the United States so you definitely have a fan over here and I subscribed. Keep up the good work and I'm ready to see that 4-cylinder fire up. That thing's going to be a beast. I hope it runs like you want it to. Something tells me it will. You seem quite knowledgeable and educated so there's no doubt in my mind. Keep up the good work bro!!