1964 Bridgestone BS-7/D

subrew

New Member
I'm fairly new here, but I thought I would post some pics of my last project. It started life as an abandoned Bridgestone BS-7/D. A little rotary valve two-stroke 50cc job. This is my second Bridgestone project, having previously built up a 1964 90 Sport. I'll keep the words brief, and let the pics do the talking:

Before. Mostly complete, but several stock parts are in bad shape. My goal was to build up a little cafe racer, without making any real mods to the chassis that couldn't be undone.
before%2B002.jpg


before%2B004.jpg


Getting torn down:
teardown%2B004.jpg


Bare frame. Typical early/mid 60s tiddler pressed steel frame:
teardown%2B007.jpg


Engine was frozen, but a few days of ATF treatment worked wonders:
teardown%2B011.jpg


Massive combustion chamber:
teardown%2B009.jpg


Frame was cleaned up and quickly primed just so I could play with it for a few months during the build:
bs7.jpg


As luck would have it, a spare set of Sport 90 front forks fit, in place of the leading link setup which was damaged. I also test fit a Sport 90 fuel tank and fashioned a mockup seat and rear cowl just for eye balling:
seat.jpg


Started building a seat and rear cowl. I usually have some 1/4" fiberglass panels laying around the scrap bin at work:
seat%2B002.jpg


Foam, previous to carving:
seat%2B003.jpg


After carving, laying up the cloth:
Photo0184.jpg


Mockup with tank and seat:
seat%2B001.jpg


After some color:
IMAG0088.jpg


Cleaned up the stock wheels, spokes and hubs, installed fresh tires I had from a previous project:
front%2Bwheel%2B004.jpg


Did a bit of striping and lettering. My first attempt with pin stripe brushes. I give it a solid B- on the result, but I'm sure I'll improve:
rear%2Bwheel%2B004.jpg


rear%2Bwheel%2B003.jpg


I didn't make pics of the engine when I was going through it, but found this shot of the clutch side before any work was done. It was very clean:
inside%2Bengine%2B003.jpg


Engine installed:
engine%2Bin%2B001.jpg


Built a pipe, using calcs from some software I found online. I was really trying to keep it tucked tight to the frame:
exhaust%2B003.jpg


Got it wrapped and built a little AL heat shield:
exhaust%2B007.jpg


Pretty much "After" shots. I've put about 100 miles on it, and haven't had to fiddle with much. It starts right up, idles great, and keeps the mosquito population down in the neighborhood:
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Hope you like it.

I'll try to document my future projects in more of a build style thread. I unfortunately found out about this site after I started.

Chris H.
 
Okay....I admit, I clicked on this thread out of morbid curiosity. I didn't think anything could be done to make a Bridgestone "sporty". :-[

WELL DONE!
That looks like it would be a blast to buzz around on. 8)
 
That's one cool bike! I'd kick over an R1 to get a better look at your Bridgestone.

Great job!
 
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