BOTT Evil Twin

[JimLill]

I was in another forum and noted that our own 'Curious' has a name over there of 'Evil Twin'. That reminded me of a evil twin in my past....

As there is little bike activity here, I thought I'd post something on my twin...

The bike was built is the early 80's for the AMA Battle of the Twins Class. I had both Amateur and Pro level riders and we did best when we were forced to run up a class when I had a pro in the saddle. Actually made $ at Mid-Ohio, rare for club racer type guys.

The bike was basically a 750 Triumph Twin that evolved from an old AMA Dirt Track racer.

Frame: 1968 Triumph
Motor: 1975 Triumph 750cc
Exhaust: custom by our shop, Robinson Rochester
Suspension: Marzocchi
Wheels: Dymag magnesium
Rearsets: custom fab
Brakes: Full Brembo

It had a few cool things I designed and did most of the fab on:

Front Anti-Drive Braking via compound action progressive linkage
Rear Anti-Squat Braking via Linkage

http://www.vectorbd.com/users/jpl/bot2.gif

[Sterling Doc]

Looks cool, in an evil/retro sort of way. Did they require treaded tires, or was that state of the art back then? Antidive and squat would have been very cuttting edge - pretty cool! Why such an old frame (even for then)?

[JimLill]

I had slicks and intermediates on hand. It rained before that race was completed. The anti-stuff wasn't so new, BMW had done it a few years before. My use of yokes at the axle and compound levers were though. The old frame was used as it was known to work well from its dirt days. It was de-lugged and gusseted. In those days, we liked to do that kind of odd stuff!

[JimLill]

Here is gen 1 of that BOTT bike

http://www.vectorbd.com/users/jpl/bot1.gif

I just dug out another evil twin........ this is one I worked on, not my bike.
1982 CanAm Sonic 500 frame reworked to be a Sonic 750.

Replaced the Rotax 500c single with a Triumph 750 Twin

http://www.trackpedia.com/photogarage/data/500/sonic750.jpg

[curious]

I was in another forum and noted that our own 'Curious' has a name over there of 'Evil Twin'.

I'm the nice half of the pair. The other guy's a real pr*&ck... ;)