Jawa / Suzuki / Aprilia = JSA 650RR…
It’s simple to take with no consideration the alternatives many people should personal and work on our personal bikes. Just lately we heard from Roman Juriš of Slovakia, who grew up in communist Czechoslovakia, the place outdated Jawa machines have been nearly the one bikes out there, and alternatives for personalization have been “nearly zero.”
He labored for a yr in bike growth at a moped manufacturing unit earlier than his necessary navy conscription, and didn’t trip once more for 20 years — not till the autumn of the Iron Curtain:
“I merely didn’t have the cash for a motorbike. It was solely after the autumn of communism that ordinary life started in our nation and I used to be capable of purchase the primary bike wreck from which the JSA 650RR was created.”
Beginning with a 1985 Jawa 350 sort 634, Roman got down to create a machine with “knee right down to asphalt” driving traits — fairly the problem for such an outmoded machine, particularly a wrecked one.
With restricted funds and components availability, Roman had to make use of what was at hand, working in his 4×4-meter basement. He swapped within the 650cc Rotax single from an Aprilia Pegaso — greater than doubling the horsepower — and constructed the remainder of the body to carry it. The suspension and wheels come from a Suzuki donor, and the tank and tail are GS500 items.
Nicknamed the JSA (Jawa / Suzuki / Aprilia) 650RR, the finished supermono was decked out in Yamaha-inspired “fight colours” and ridden to the restrict:
“It was a distinct world in comparison with the unique Jawa. On the age of 46, I put my knee down on the asphalt for the primary time on this bike.”
This was Roman’s first construct, and as Slovakia’s motorized vehicle rules tightened, the JSA was not avenue authorized, so it’s now in a small personal museum within the Czech Republic.
Under, we discuss to Roman about his historical past and the construct. Keep tuned for extra creations forthcoming from the Slovakian builder!
Jawa 650RR: Builder Interview
• Please inform us a bit about your self, your historical past with bikes, and your workshop.
I’m 58 years previous (younger) and I rebuilt my first bike once I was 16 years previous. I put in two exhausts pipes on a two-stroke Jawa 50cc. I tousled the efficiency, however I used to be only a native dude. I grew up in socialism and the probabilities for customizing have been nearly zero. The one bike out there was an outdated Jawa 350. I had a entrance disc brake and fairing on it moderately than manufacturing unit.
As an 18-year-old, I labored for one yr on bike growth in a moped manufacturing unit. Earlier than I realized something, I used to be recruited as a soldier. After my necessary navy service, I ended driving bikes for 20 years. I merely didn’t have the cash for a motorbike. It was solely after the autumn of communism that ordinary life started in our nation and I used to be capable of purchase the primary bike wreck from which the JSA 650RR was created. I’ve at all times modified bikes as a passion, by no means professionally.
• What’s the make, mannequin, and yr of the donor bike?
The paperwork have been issued on Jawa 350, sort 634, yr ~1985.
• Why was this bike constructed?
I wished to see if I might construct a easy bike just like the Jawa manufacturing unit was supposed to construct. The principle situation was “knee right down to asphalt” driving traits.
• What was the design idea and what influenced the construct?
I used to be a giant fan of Yamaha racing bikes from the 70s, so I selected such “fight” colours.
• What customized work was completed to the bike?
Jawa / Suzuki / Aprilia = JSA. Solely the 2 backside tubes stay from the unique Jawa cradle body; I made the remainder of the brand new body. I put in an Aprilia Pegaso 650 engine within the body. The wheels and suspension come from an unknown Suzuki. The tank and rear fairing are from a Suzuki GS500.
• Does the bike have a nickname?
I believe JSA is a adequate nickname. Whereas sorting via the pictures, I discovered the “Reuma Racer” label. It was extra of a joke than a nickname.
• Any concept of horsepower, weight, and/or efficiency numbers?
The Aprilia engine was purely inventory, so it had about 48 hp. In comparison with the unique 23-hp Jawa, it was a brilliant efficiency incrase. The load was additionally akin to the unique Pegaso. The Jawa weighed round 150 kg.
• Are you able to inform us what it’s wish to trip this bike?
It was a distinct world in comparison with the unique Jawa. On the age of 46, I put my knee down on the asphalt for the primary time on this bike.
• Was there something completed throughout this construct that you’re notably pleased with?
All the pieces I did on this practice was fairly new to me. I used to be pleased with myself for even placing it collectively and driving it. After a while, the principles for technical inspection bought stricter and the bike couldn’t be used legally, so it ended up in a small personal museum within the Czech Republic.
• Is there anybody you’d wish to thank?
To my spouse for permitting me to dedicate myself to bikes once more after so a few years. She might have regretted it many instances since then, as a result of I fell irrevocably into this ardour.
Comply with the Builder
I’m an occasional correspondent for the Slovak web site motoride.sk beneath the identify “Romoto“. Right here you will see that my articles about bikes, written with love and fervour for building and customising.