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One after the other: Adventures in Rotax...

Jung

Member
Joined
Oct 12, 2021
Location
Los Angeles
Moto(s)
Ringdings, Wah-wahs and Beurrrrghs.
Name
Joe
Given that it is warmer than the devils's jockstrap in my shed at the moment, and about as fragrant, it might be a while before I crack on with this. However,
this is the 2nd and totally random, impulse buy I made, just after acquiring my RD250 in December last year.

Shortly after picking up the RD (in fact so shortly, that I hadn't had time to unload and stash it,) I set off for a couple of days work in SF, followed by a few days off with the Mrs and nipper, just near Ft Bragg. On the way up, we stopped off in Pt Arena to say hello to Dave at Zen Motorcycles, which has been something of a ritual ever since we moved here back in 2013.

On the very first visit, he kindly gave me a little tour and showed me a super cool, 250 race bike, with a Rotax tandem twin engine. The history was a little cloudy and the frame itself was a total head scratcher. I'd not really thought about it in the intervening years but for some reason it popped into my head to ask..

Turns out the owner had passed and the bike was for sale, so a day or two later, I snuck off with the wean and drove down through a storm from Ft Bragg to pick it up....

After getting it back down and sorting through all the paperwork and bits, there's actually a fascinating story behind it. It is a copy of a Kobas Rotax, commissioned by well known racer and Rotax importer Tony Murphy back in 1982. He bought the original from Rotax, when they switched to Aprilia and was so enamored with the design, he got an Australian fabrication whizz, to knock up a few replicas.

Tony is a very cool chap (and certified loon.) After chatting on the phone, I drove over to his place so he could take a look, show me the original bike and tell me a bit more about it.

I've done nothing more than clean the carbs, poke around a bit and fire it up to annoy the neighbors on xmas day. It shouldn't need much - it's not run for long enough that I'll do a basic strip on the engine to replace the seals and give it a good check over. I've only a parts list and it's quite unusual. The 256 Rotax seems to have had a reputation for go, but not necessarily a bike you'd want to follow....hopefully, I'll be able to enjoy the former whilst avoiding the swings and arrows of outrageous seizures....
 

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Gonna need a little Jung love.

Have fun! :Port
 
The 256 Rotax seems to have had a reputation for go, but not necessarily a bike you'd want to follow....hopefully, I'll be able to enjoy the former whilst avoiding the swings and arrows of outrageous seizures....

how cool is that? :thumbup

90921869_m.jpg


pre-'85 non-powervalve type.

picture.php


post '84 engine, w/ powervalves.

picture.php


impressed you got it started. does it just bump-start? can't imagine it's fitted with a electric starter motor or a kick-starter ... :ride
 
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Cool story bro. Seriously.
A square two?
I love Rotax. Aren'y they Canadian now?
 
Rotary valve like the Gamma. Pretty cool project. Would LOVE to hear a video with sound.
Did you say you are located in Fort Bragg? I can ride there from Eureka in a few hours sometime. And get to do the Leggett to the Coast section as a bonus!
Edit: After re-reading, it sounds like you were up north on business/vacation.
 
That is a very interesting machine. Looking forward to the updates on this project thread.

I really need to start another project bike.
 
Awesome. Can't wait to hear an audio clip.

Mad
 
Cheers gents. I'll fire it up again and try and record it before I take it to bits, it bump starts easily enough. It's a distinctive sound, quite different from the 180 twins I'm used to. The last rotary valve motor I've played with was a little Suzuki, going on 30 years ago. The Lectron carbs are completely new to me too, they're an interesting design.

Lonster, alas I'm in Los Angeles. I absolutely love it up in Mendocino / Humboldt, amazing country and some of the best roads ever. Wish I was a bit closer!
 
I applaud your dedication to locallized d-i-y mosquito abatement.
 
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