Author Topic: Bridgestone Hats, Patches & Other Stuff  (Read 99059 times)

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Offline paul

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #280 on: January 27, 2018, 12:06:26 PM »
So for EIGHT years, one of the rarest motorcycles in the world resided in the USA. Did  anyone on this web site actually see it? Too bad  this machine wasn't  displayed at AMA vintage days with the other Stones a few years  ago.I recall reading that John Sullivan helped some Australian BS  owners restore their machines in the late 1980s. Same Sulivan?

Offline bsracer

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #281 on: January 28, 2018, 09:23:42 AM »
I guess that's the story. Now it's going to Australia and no one knows anything about it.


paul

Offline paul

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #282 on: January 28, 2018, 09:44:44 PM »
Will end up hidden at some mansion. Forty years from now will turn up at auction. What a shame

Offline coxy

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #283 on: January 30, 2018, 02:10:46 PM »
This is interesting
I will be going up to nabiac to the national bike museum sometime this year to look for a old mates bike
I will ask if it's there

Offline RayK

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #284 on: January 30, 2018, 04:24:47 PM »
Also sold at the Las Vegas Mecum Auction for $929,000 USD was a Vincent owned by Tony McAlpine and used in the Australian land speed record. So another lost from Australia to ? USA. (From the Aus VJMC site).  As well as a Tony McAlpine/Jack Ehret Vincent bought by someone in Tasmania from France. This might be a clue as to where the 50cc BS Racer ended up. Maybe the Museum of Modern Art in Hobart. The owner is a mega rich collector of modern art etc.
RayK
BS 175DT, BS 50 Sport x 2, BS 90 Mountain x 3, BS 90 Deluxe, BS 90 Sport x2, Chibi, BS 60 Sport, BS 90 Trail, BS100 Sport.

Offline moonpup

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #285 on: January 30, 2018, 04:37:23 PM »
Here's another part the new owner could pick up for a spare....

http://yahoo.aleado.com/lot?auctionID=n248431319#enlargeimg
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Offline coxy

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #286 on: January 31, 2018, 03:46:02 PM »
why would Bridgestone use a British amal carburettor ????
« Last Edit: January 31, 2018, 03:48:24 PM by coxy »

Offline moonpup

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #287 on: January 31, 2018, 05:14:24 PM »
why would Bridgestone use a British amal carburettor ????

Ya got me Andrew, but the seller seems to think it's for a "BS50*EJR*50cc2 cylinder" All I know is that I don't know enough about those racers to know what carbs they used.  ;D
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline BRT-GTR

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #288 on: January 31, 2018, 05:39:16 PM »
        I also wondered why BS would use an Amal carb.  Googled the carb numbers without sucess but then found this :-
             http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=516951

     Seems there was a long standing link between Amal and Mikuni. The number '392' translates as Mi-Ku-Ni in certain Japanese scripts. The above forum thread explains it.................... We live and learn :D

        So it is feasible the carb was used on a BS 50 racer but I would need further evidence before buying.
        Note also the two scribed/centre punched lines across the carb body. One is marked 'NJ'- Needle Jet level ? other one marked 'OL' ?    May have been used to set the remote float level ?               Brian
« Last Edit: January 31, 2018, 05:52:44 PM by BRT-GTR »
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Offline coxy

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #289 on: February 02, 2018, 01:55:12 PM »
nice read Brian
this just leaves me with questions though
is the 50cc race bike a non rotary disc vale?
what year is the race bike and why wouldn't they use a carb like the SR
 the monoblock carb would have been on its way out in the mid-late sixty's and replaced by the concentric  type maybe the monoblock is less prone to distortion of the throttle body ?

Offline moonpup

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #290 on: February 03, 2018, 03:13:55 PM »
Found this pic for a 1964 bike. You can see the carb, but gets too fuzzy for my old eyes when enlarged!  :o
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Offline moonpup

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #291 on: February 03, 2018, 03:17:28 PM »
Here's a video of a EJR3.   Three versions?

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Offline paul

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #292 on: February 03, 2018, 08:31:51 PM »
I think  at least two versions. I think the early  water cooled twin fifty was said to have remote float carbs, . Also carbs may have been changed after these machines left Bridgestone and went home with their new owners/caretakers. Carbs may have been changed in an effort to improve ride ability. Also I think more than one gas tank size was used.

Offline paul

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #293 on: February 03, 2018, 09:02:09 PM »
see elsburg-tuning  web site for pictures of different. Bridgestone 50 racers. Steve Murray article on this web site references two gearset / ztransmissions

Offline BRT-GTR

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #294 on: February 04, 2018, 09:11:12 AM »
           See also Graham Week's history article for info on EJR-1 & 2. Unable to establish details of the  EJR-3, so far, but all were 50cc, watercooled, disc-valve twins and all produced in just a short period 64-66 at which point BS closed their race shop. Grand prix racing proved to be too expensive to pursue.

      Here's a close up of the EJR-2 engine showing the remote float carb. I'll leave you to decide whether the carb is the same as the one on Ebay.   Float chamber looks like it may be mounted on a bracket from the cylinder head, surely not the best arrangement but I think I can see a short length of rubber tube above the float chamber to effect some isolation from vibration.

       
« Last Edit: February 04, 2018, 10:47:57 AM by BRT-GTR »
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Offline BRT-GTR

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #295 on: February 04, 2018, 10:45:13 AM »
               Paul,
          I noticed, Steve Murray suggests that he may have been responsible for BS adopting a 14 speed box after he commented the bike was short of 4 gears while testing the 10 speed machine at Oulton Park. 500rpm powerband !!

      Did anyone click on the 'TD1 carb' link in the post I put up above, brings you here :-   https://www.tapatalk.com/groups/yamahatwostroketwins/td1-pics-t13.html
     See the photo of the 63 Tohatsu in post No. 9. Note the 'hightech' coil & float chamber mounts !!.  BS recruited many of Tohatsu's  engineers when they went out of business in 64. BS would have added disc valve induction, it was 'their thing'. They had previous experience and discs were seen by many as the future of 2S dvelopment at that time. Water cooling also became essential as revs and power outputs rose but even with this BS were struggling with high piston temperatures. Again, see ' prug chop' comments in Steve Murrays article.
         A brief picture of BS's short racing venture is starting to develop,         Brian
« Last Edit: February 04, 2018, 10:54:27 AM by BRT-GTR »
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Offline paul

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Re: Bridgestone Hats, Patches & Other Stuff
« Reply #296 on: February 04, 2018, 07:12:12 PM »
Mick Walker wrote in his book Classic Japanes Racing Motorcycles copy write 1991'that, after Tohatsu went bankrupt almost all the engineers formally employed by Tohatsu moved to BS Motor Company. Tohatsu went bankrupt in February 1964. But there are many differences between  Tohatsu and BS E JR. First  the BS  was water cooled , the Tohatsu air cooled The BS has rotary valve versus the piston port system on the Tohatsu. The BS has a 10 or possibly a 14 ratio transmission. The Tohatsu has a 6 ratio transmission. The dry clutch on the BS can be seen on the right  side of the engine. The Tohatsu clutch can be seen on the left side of  engine.  I point out these differences to show that, in my opinion these two engines are not close relatives.

 


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