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The bike that Schwantz raced

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The bike that Schwantz raced

PostAuthor: faffi » Sat Nov 04, 2017 6:20 pm

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Bike year & model: 1982 XV750SE with XV1100 engine, XT600Z shock absorber, 18" Seca rear wheel
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Re: The bike that Schwantz raced

PostAuthor: Hellgate » Sat Nov 04, 2017 6:50 pm

Built by Bill Kasson of Kasson Yamaha in Austin, TX.ImageImageImage

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Re: The bike that Schwantz raced

PostAuthor: faffi » Sun Nov 05, 2017 5:09 am

Thanks for sharing the info on both Kasson and Work's bikes! The article was hard to read for old eyes but interesting to see how close to stock it was internally.
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Re: The bike that Schwantz raced

PostAuthor: nanno » Sun Nov 05, 2017 6:53 am

Love the use of a modified YZ250 rear swingarm. (Not in text, but a thing of personal knowledge...)
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: The bike that Schwantz raced

PostAuthor: Hellgate » Sun Nov 05, 2017 8:40 am

IIRC, that swingarm is from a TZ700 or TZ750, and has been modified. I found the guy who built the swingarm and he had one of the adjustment tracks left. We were emailing and one day he didn't reply. Oh well.

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Re: The bike that Schwantz raced

PostAuthor: nanno » Sun Nov 05, 2017 12:32 pm

Could well be, I modified a 250 swingarm for one of the German racing guys, but he never used it in the end. Nowadays, I'd just fabricate one from scratch and model it after the original from Schwantz'es bike.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: The bike that Schwantz raced

PostAuthor: Hellgate » Sun Nov 05, 2017 1:17 pm

That's my plan too. Someday. A Ducati 900SS swingarm could possibly be adapted too.

I have a YZ490 swingarm in the garage too. It was all of $25.00.

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Re: The bike that Schwantz raced

PostAuthor: ejunker » Fri Dec 20, 2019 9:44 pm

Hellgate wrote:Built by Bill Kasson of Kasson Yamaha in Austin, TX.


Pete,
I just sold my two XV-R’s to Jesse Davis whose dad built “Lurch”, the Schwantz 920R race bike from Kasson’s shop. Jesse is building a couple of racers for that classic super bike series that’s real big on the west coast just now. Jesse works with Roland Sands Designs. He’d appreciate hearing from you.

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If it's not from Texas, does it really matter?
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Re: The bike that Schwantz raced

PostAuthor: Hellgate » Sat Dec 21, 2019 8:10 am

Hi Ed,

It's great to hear from you. I hope all is well. I'll drop Jesse a line. I bet he's a wealth of information.

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Re: The bike that Schwantz raced

PostAuthor: Sami_Timonen » Thu Feb 06, 2020 2:23 pm

I have a dream of building replica of this racer some day. Very good that people post mods that are made to this bike.

I have TR1, close to orginal in occasional drive bike and will serve base for replica some day.

Time for build is holding me back i have good tools and garage to do it. (also money needs to be saved) some parts are already on self waiting.

Motor wise i would need slightly more than classical 90hp :) maybe 120hp would do :)

S

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Re: The bike that Schwantz raced

PostAuthor: nanno » Fri Feb 07, 2020 2:57 am

The German racing guys are currently around 120-135hp at the rear wheel... The amount of effort it takes and the shift in powerband have a tendency to make you rather unhappy unless you use it for racing only.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

*Look to my profile for a link to my blog*
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Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: The bike that Schwantz raced

PostAuthor: Sami_Timonen » Fri Feb 07, 2020 4:52 am

Hi

Yes better to have less in peak power and more on the whole rev range.

I was thinkin shortcut for power, with eaton m24 or something same size with better specs.

I was thinking that i would supercharge air into frame to have it working as collector. Probably will cause heat problems.

When i start this I will need some other bike to use. In Finland i believe no problems getting it to streets because no emission reguirements to this old bike.

At least i can aim for 70hp + 20% and try to get highest possible torque and have power spread to whole rev range (if regulations decide to be strict) but because suspension and breaks will improwe I dont think even 120hp would be issue.

What should be build more durable in engine if i would do this kind of thing?

Anyway im not starting this anytime soon, some parts i might slowly buy to shelf if i see something good in internet. (Might also be one of fore ever lasting builds) but thats ok to me :)

One roots type project i have already seen to these bikes, but no clue of power or torgue he was getting.

S

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