MNSBR: A Few Tul-aris Details - MNSBR

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A Few Tul-aris Details

#1 User is offline   Jim Icon

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Posted 18 March 2019 - 08:55 AM

I've deleted all the ad hoc posts I made in this thread and created a single .pdf file with photos and text. It's stored on a Google Drive and is available to anyone to view who has this link: https://drive.google...9SvGtrmjKSrI9DB

Feel free to post the link elsewhere.

I may update the file from time to time. If I add any major content, I'll post the fact that I've done so here.

My thanks to everyone who asked questions and made comments!

This post has been edited by Jim: 31 March 2019 - 02:29 PM

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#2 User is offline   POE Icon

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Posted 18 March 2019 - 09:22 AM

Cool stuff! I like that last bit how he got the tul-da frame in the oven, haha.

I wish this bike was still in action. Or even better, I wish it started a trend to get more production of similar race machines.
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#3 User is offline   ripperd Icon

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Posted 18 March 2019 - 10:44 AM

View PostPOE, on 18 March 2019 - 09:22 AM, said:

Cool stuff! I like that last bit how he got the tul-da frame in the oven, haha.

I wish this bike was still in action. Or even better, I wish it started a trend to get more production of similar race machines.


I would bet it would not be particularly easy to ride, given the power curve of a 2 stroke tuned for peak HP. Coming on the pipe while leaned over is probably pretty sketchy.

The power curve probably looked something like this (just shift the whole thing down by 20hp):
Posted Image
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Posted 18 March 2019 - 01:29 PM

Very cool. Thank you for taking the time to post.
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#5 User is offline   Champ Icon

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Posted 18 March 2019 - 02:15 PM

Jim who did the bodywork out of the group? Was that Rob himself or was someone else proficient with Carbon?
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Posted 18 March 2019 - 02:55 PM

I love all this back story. Keep it coming! I wish I could have been around to follow that story as it unfolded.
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#7 User is offline   miweber929 Icon

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Posted 18 March 2019 - 06:48 PM

I LOVE LOVE LOVE this info, please keep it coming!!!!

Itís like Iím in my 20s all over again dreaming about how cool that thing must have been to work with.
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Posted 19 March 2019 - 01:21 PM

I'm going blind here!

Thanks for the trip down memory lane.

For a kid that spent his formative summers porting (screwing up) all manner or two strokes from dt's to rd's and learning to ride sometimes colligenous ill tempered junk to the occasional masterpiece of dumb luck;

I can only fantasize what twisting that beasts tail was like.



King Kenny said that was the only motorcycle that ever frightened him, lol.
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Posted 19 March 2019 - 04:18 PM

Jim,

With your permission, I'd love to repost/copy your Tul-aris story over on the Yamaha FZ07 race forum. I know there are several guys over there that would love to read this stuff. Like you said, it's easy for this stuff to get lost or forgotten over time.

Thanks,
Dave
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#10 User is offline   miweber929 Icon

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Posted 19 March 2019 - 05:51 PM

TZ750. Drooooooooolllllllllllll.......................
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#11 User is offline   henks Icon

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Posted 19 March 2019 - 05:52 PM

View PostJim, on 19 March 2019 - 04:26 PM, said:

Feel free to post a link to this thread. I am still making minor edits to the posts I've made. Maybe when I'm all done, I'll compile it into a .pdf file?

Yes!!!
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#12 User is offline   Champ Icon

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Posted 20 March 2019 - 07:46 AM

View PostJim, on 20 March 2019 - 07:30 AM, said:

Since the Tul-aris used a toothed belt (which does not cause a reversal in direction) for its primary drive, no intermediate jackshaft was required.

It's commonly known that the transmission is from a Ducati 916. What's less commonly know is that the gearshafts are stacked vertically. This allows the swingarm to be longer for a given wheelbase. Rob had this idea before it appeared in any production motorcycle. To better accommodate the engine's narrow powerband, the gearbox contained some custom ratios provided by Vee Two (a Ducati specialist in Australia).

Looking again at the photos, I believe I see the belt drive right on the side of the motor, correct?

Assume this means the engine and trans were not connected internally?
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#13 User is offline   crakerjac Icon

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Posted 20 March 2019 - 07:55 AM

This is SO cool. Makes me wonder what I have been doing with my life...
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Posted 20 March 2019 - 08:00 AM

View PostChamp, on 20 March 2019 - 07:46 AM, said:

Looking again at the photos, I believe I see the belt drive right on the side of the motor, correct?

Assume this means the engine and trans were not connected internally?


Check out this link: https://www.cyclewor...lassics/#page-5

It includes this good shot of the belt drive sans belt and cover.

Posted Image






Jim, what are those 2 little things zip tied to the dog-bone linkage under the rear shock?
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#15 User is offline   ripperd Icon

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Posted 20 March 2019 - 08:32 AM

I was getting ready to type up "why not just run the motor backwards", because a 2 stroke is pretty happy (with the correct spark timing) to run in reverse direction. But then I did a little searching and realized that even though things are mostly symmetrical, the rod angle during ignition is opposite, which as you alluded to needs to be in a certain direction since generally the port area and piston are designed around it for maximum support.

I guess reverse rotation works in snowmobiles for electronic reverse because 1) it is only running that way for a very small part of the engine's lifetime, and 2) the power level is quite low, reverse on a snowmobile is only for slow creep manuvering.
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