An old picture

bluej58 wrote: Not sure on the year but I took this picture up at Road America .
I was there for the first Super bike race they put on sometime around 79 and for many years there after.
Them was the good ol days.
JD

Guessing 1982 - this an early version with the Blue Magnum carbs (think Lectrons )that they tried for a while.

ed spangler wrote:

wireman wrote:

Attachment calf-n-ahracingspecial.jpg not found

heres Larry C on his factory backed calf-n-ah special back in 1935,he was a company rider for shwinn back then.
he was porting flathead ford blocks back then after hours,working on his own overhead cam conversion kits :woohoo: :woohoo: :woohoo: :woohoo: :woohoo:

COOL!!!

Retro bike with a 2 cycle

Jack wrote:

bluej58 wrote: Not sure on the year but I took this picture up at Road America .
I was there for the first Super bike race they put on sometime around 79 and for many years there after.
Them was the good ol days.
JD

Guessing 1982 - this an early version with the Blue Magnum carbs (think Lectrons )that they tried for a while.

I never saw those carburetors on any other bike and they went straight back to CRS with the 750 Superbikes. I'll bet those Blue carbs made power up top but didn't have the transitional response required for broad throttle response. I know several guys that tried Lectrons in applications other than drag racing and they did couldn't make them work...

True Larry, the Blue Magnums were a short lived experiment- just like Lecrons they work at idle and WFO and were no good for Superbike. However, Lectrons worked a charm on all those 2 stroke roadracers,the first ones I ever saw were on Roberts' TZ-750.

roy-b-boy-b wrote:

Nice.
But are those big ol KZ wheels?

I'm guessing those wheels are real Morris mags.Some of the best roadracing I've ever seen was in the heyday of the TZ's, Zuks and KR1 750's.

Can you imagine running one of those puppies on flattrack? Sheer terror!

roy-b-boy-b wrote:

I'll bet his neighbors hate him even worse than mine hate me. :evil:

650ed wrote: Can you imagine running one of those puppies on flattrack? Sheer terror!

Attachment tz750_2011-12-21.jpg not found

:lol: KR was a pioneer of the art of doing things that would give normal people a heart attack...

LarryC wrote:

Jack wrote:

bluej58 wrote: Not sure on the year but I took this picture up at Road America .
I was there for the first Super bike race they put on sometime around 79 and for many years there after.
Them was the good ol days.
JD

Guessing 1982 - this an early version with the Blue Magnum carbs (think Lectrons )that they tried for a while.

I never saw those carburetors on any other bike and they went straight back to CRS with the 750 Superbikes. I'll bet those Blue carbs made power up top but didn't have the transitional response required for broad throttle response. I know several guys that tried Lectrons in applications other than drag racing and they did couldn't make them work...

There were a few of us that ran Blue Magnums in the 1982 Superbike class. I modified mine to eliminate the 2 glaring problems with them. After modification, they worked better than conventional carbs...and the bike was very fast.
The mods were admired and emulated by the Japanese engineers from Kawasaki and S&W.

problem 1; heavy return spring req'd to overcome the stiction of the flat slide to carb body upon decel, when engine vacuum was high.

solution was a rack and pinion style bellcrank on carb rack so the carb slides were mechanically opened AND closed...not relying on spring or cable to close them.

problem 2; very hard to adjust the mixture. Even though there was only one mixture adjustment for metering range, the carb needed disassembly for any tweak. Fine tuning was therefore too inconvenient, leaving mixture incorrect at times.

solution was to replace center rod in slide with a machined brass piece that extended all the way into carb. The mixture adj screw was then placed inside this tube with the hollow extending to the top. This exposed hollow allowed for a simple screwdriver to reach into the bowels of the carb and adjust mixture like a lawnmower.

My bike never ran better, but I foolishly traded those carbs to a drag racer after my retirement from Pro racing in 1983

this is the only pic I could find with those carbs in it...but the carbs were painted black and they dont show up

Thanks for the detailed reply. Do you have any pictures from that era? Roy