RICKYAMAHA
New member
The registry was done april 2004 for all SR,s. I would love to see your pics of the 72 SR . Mine is all apart and the frame is gone to a repair shop for welding but the seat, the motor and pipes are done. The hood should be home soon also.
Richard
Richard
Gorkon
New member
Yeah I'll get me up here, I don't think anyone would object, I just have to transfer them to edit and downsize them to be able to post them. I don't know how some of thse guys post such nice big photos here? They are just pics from the net that I found and most have probably seen them before and may even be someone's sleds on this site. One of them is Lynn Trapp's 72 pictured in the back of the 73 brochure. Keep us posted on your progress, I'd be great to see some more pics of these rare world champions! G.
Gorkon
New member
Here's what I found. If you look off to the top left of the photo with the SSR, you'll see another one all by itself sitting out in the middle.
Then look at how the SSR makes everything else look like a tub!!!! lol Enjoy. G.
Then look at how the SSR makes everything else look like a tub!!!! lol Enjoy. G.
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2ooosrx
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I still have Ed Schubitzke's 1973 SR 643 that I used to grass drag in many events and it ran at 8500 with his pipes on it. We engine dynoed it back when I was racing it at 138 hp with his pipes and we also had Jim Adema's Thunder-Jet 643 that Dynoed in on the same dyno at 98 HP. Pretty radical power on those sleds back in the day.
Gorkon
New member
I can just imagine what kind of power one would make with modern porting and pipe technology. But I don't suppose you'll find jugs at the corner store for grinding on?
Seriously though, what do you 643 guys do for parts? G.
Seriously though, what do you 643 guys do for parts? G.
dynofun
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There are 2 running the vintage circuit with current pipe, carb and porting tech by DRP. Very nice sleds indeed!
Gorkon
New member
Really? What years? I'd love to see them and learn more about them and the modifications.
Looks like Ed Schubitzke was quite the man with the pipes. He built his own! Was that hobby or business for Ed? G.
Looks like Ed Schubitzke was quite the man with the pipes. He built his own! Was that hobby or business for Ed? G.
dynofun
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Gorkon, go to www.vintagesleds.com and get on the bull sessions forums. You will see pictures and all the info you want.
2ooosrx
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The sled was dynoed back in 1977 on a waterbrake dyno and showed 138 hp. The motor was completely ported out and ed built his own pipes for the sled and I still have the sled and pipes. It was strickly built for grass dragging and the hardest part was keeping rings in the sled. The sled also had 58mm keihin carbs with mechanical acceleration pumps in it.
Gorkon
New member
58's!!! Those are sewer size! I can just imagine the ring problem trying to slide past holes that big!
I've been in vintage sleds, I haven't found anything yet. Thanks for the tip. G.
I've been in vintage sleds, I haven't found anything yet. Thanks for the tip. G.
dynofun
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What is your E addy? I'll give ya the goods!
Gorkon
New member
Hey Rick, I found an interview with Mike Trapp talking about the 71 and 72 Eagle River wins, and he mentioned a bad crank problem on the 72 643's where they were breaking off at the PTO end.
He said that for the Eagle River race, one of the mechanics had a bracket made for it that tied the chaincase to the clutch in order to prevent the shaft from breaking. It obviously worked for the race, as I guess he jumped into the lead right off the line, then basically never looked back and then just stretched that lead all the way to finish line!
Are you aware of this? Do you, or does anyone else know if the problem was just a bad batch of forgings? Or the fact that chaincase was standing out there in front flexing? Did this problem extend into the fan cooled sleds? Is it a problem on the 73 SR's? G.
He said that for the Eagle River race, one of the mechanics had a bracket made for it that tied the chaincase to the clutch in order to prevent the shaft from breaking. It obviously worked for the race, as I guess he jumped into the lead right off the line, then basically never looked back and then just stretched that lead all the way to finish line!
Are you aware of this? Do you, or does anyone else know if the problem was just a bad batch of forgings? Or the fact that chaincase was standing out there in front flexing? Did this problem extend into the fan cooled sleds? Is it a problem on the 73 SR's? G.
dynofun
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Oh yeah... That is part of the old folklore from when he beat Duhamel's 800 with a 440 to win the Eagle River World Championship. The mechanic was Gordy Metz who ended up being with Yamaha longer than anyone. He finally retired a few years ago. The early 643 had that goofy step down crank instead of a tapered one like on all sleds today. Most people have updated them.
Gorkon
New member
It was an interesting read, and yes he did mention Gordy Metz as the guy responsible for the coming up with the bracket for 72 643's. What he attributed the 433's advantage to over the 800's in 71, was the special carbs to run the alchohol fuel that year. He also said that 72 was the last year they allowed them to run alchohol.
Where are these guys getting the 'updated' cranks? Thanks. G.
Where are these guys getting the 'updated' cranks? Thanks. G.
dynofun
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Using newer ones or making them. I've seen ad on tapers too. Scary...
YAMAHABUNCH
New member
Hey Gorkon
Here is a pic of the 72 643 brace this is the original from Lynns sled
also a pic of "The special alchohol Carbs" from 71 This is the engine that won the 71 W/C ! And they could NOT run Alchohol in 72
Mike Trapp also told me the very next race that they ran his 643 in was Spokane WA the crank broke in the first heat
Gordy was not the only one involved with the brace, Mike Bowers and a go cart racer from the Minneapolis area. All 3 of them did it
Here is a pic of the 72 643 brace this is the original from Lynns sled
also a pic of "The special alchohol Carbs" from 71 This is the engine that won the 71 W/C ! And they could NOT run Alchohol in 72
Mike Trapp also told me the very next race that they ran his 643 in was Spokane WA the crank broke in the first heat
Gordy was not the only one involved with the brace, Mike Bowers and a go cart racer from the Minneapolis area. All 3 of them did it
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Gorkon
New member
Wow! Thanks for posting the pics, they're awesome. Those carbs look wild! The first one is indeed Lynn's sled, I can tell by the unique seat. The second pic begs a couple of questions. While it appears to be a factory SR seat at first sight, the tank is not there? The next curious thing is the pipes which appear to be coated and are clearly going somplace else than the holes in the right side.
Very cool.
I checked the article again and you are correct, 71 was the last year they were allowed to run alchohol, thanks for the correction, sorry for the error. He doesn't mention anyone else regarding the brace in the article, other than a machine shop in Minneapolis, and that they had no idea if it was going to work as they had no time to test it before the race! The article gives "Muetz" as the spelling of Gordy's last name as well.
I have watched the 71 Mod 5 final on you tube, though it doesn't seem to be there anymore. I'd love to watch the 72 and have searched for it without success, any ideas?
This great stuff, thanks again. Whilst the 73 SR's corrected many of the problems the early sleds were plagued with, I just seem to have a soft spot for the 72's, perhaps it's my memories of kicking butt on my 71 SS 433. But then, there's those two back to back championships! Best. G.
Very cool.
I checked the article again and you are correct, 71 was the last year they were allowed to run alchohol, thanks for the correction, sorry for the error. He doesn't mention anyone else regarding the brace in the article, other than a machine shop in Minneapolis, and that they had no idea if it was going to work as they had no time to test it before the race! The article gives "Muetz" as the spelling of Gordy's last name as well.
I have watched the 71 Mod 5 final on you tube, though it doesn't seem to be there anymore. I'd love to watch the 72 and have searched for it without success, any ideas?
This great stuff, thanks again. Whilst the 73 SR's corrected many of the problems the early sleds were plagued with, I just seem to have a soft spot for the 72's, perhaps it's my memories of kicking butt on my 71 SS 433. But then, there's those two back to back championships! Best. G.
montynormand
Member
Gorkon
Mike's '71 WC Alchol sled had the pipes exit out the left side. Read somewhere that Mike made the comment that his lips would be numb after a race due to the fumes in his face
Mike's '71 WC Alchol sled had the pipes exit out the left side. Read somewhere that Mike made the comment that his lips would be numb after a race due to the fumes in his face
Gorkon
New member
Mike Trapp
Yes I know that the 71 WC SR 433 had the pipe exit out the left side, you can clearly see that in the pictures.
I've often wondered about the reason for that and the only one I came up with is more weight to the left side of the sled. But then how much weight could it be really? I can't think of another reason, anybody?
Here's a picture of Mike taking his checkered flag winners ride in 71.
Numb lips, lol, can you imagine leaning out that side and hearing that beast at full battle cry for the whole race? Your lips would be numb all right, among other things. Geez. G.
Yes I know that the 71 WC SR 433 had the pipe exit out the left side, you can clearly see that in the pictures.
I've often wondered about the reason for that and the only one I came up with is more weight to the left side of the sled. But then how much weight could it be really? I can't think of another reason, anybody?
Here's a picture of Mike taking his checkered flag winners ride in 71.
Numb lips, lol, can you imagine leaning out that side and hearing that beast at full battle cry for the whole race? Your lips would be numb all right, among other things. Geez. G.
