Author Topic: Water Cooled Bridgestone  (Read 1903 times)

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Online SR-175

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Water Cooled Bridgestone
« on: February 23, 2016, 04:14:14 AM »

Offline mqtsteve

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Re: Water Cooled Bridgestone
« Reply #1 on: February 23, 2016, 06:36:53 AM »
Photo from the gallery posted by "disc-valve".  BS EJR2 factory racer.  Appears to be liquid cooled as well.  Here's a link: http://bridgestonemotorcycleparts.com/index.php?action=gallery;sa=view;id=1159
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline slawsonb

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Re: Water Cooled Bridgestone
« Reply #2 on: February 23, 2016, 11:43:49 AM »
Still learning about the racers. What was the engine config of an EJR2. CC's? Numbers of cylinders? Thanks.
...bert

Offline mqtsteve

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Re: Water Cooled Bridgestone
« Reply #3 on: February 23, 2016, 12:52:28 PM »
Bert, I copied this from the comments in the gallery:
June 17, 2011, 06:44:34 AM
Sounds like there is a fair bit of confiusion around the "EJR" racers. The figures for power output were taken form a Japanese book "The History of Japanese Racing Motorcycles", published back around 1980. Although the book is written in Japanese (which I can't read) the quote of 13.5 HP at 16000 rpm was taken from the caption on a photo said to be of an EJR1. That bike has a different shaped fairing compared to the EJR2 pic alongside it, and no sign of a radiator, so I assumed it was the single.

The 50cc twins appeared in two colour schemes (1965 and 1966) with identical shaped fairings.  I believe the early twins had a 10-speed box, later changed (I think) to a 14-speed unit. Presumably that accounts for the two versions of the twin that you mentioned.

When the roadster BS50 Sport was released in 1965, Bridgestone did produce race-kitted versions and raced them in the Japanese National series. These produced around 10.5 hp at 13,500 rpm. Of course these would have had a right side carb, and the motors would have been clearly derived from the road bike.

Maybe Bridgestone did produce some early prototypes singles with left-hand carbs, but I wonder if they really would have produced them as early as 1963. After all, at that time the BS90 hadn't yet appeared, and their main product was the BS7 and Homer (both piston ported motors)

Your pic was the first time I'd seen a pic of a left hand carb air cooled single without a fairing, but it seems there is much more to these Bridgestone racers than meets the eye.

Thanks for your reply.

Graham
Link: http://bridgestonemotorcycleparts.com/index.php?action=gallery;sa=view;id=690
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

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Re: Water Cooled Bridgestone
« Reply #4 on: February 23, 2016, 03:04:12 PM »
As far as I can make out, this is a 175, bored down to 125 and water cooled. Will see what else I can find out about it's history. If anyone else knows please tell ?


Offline slawsonb

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Re: Water Cooled Bridgestone
« Reply #5 on: February 23, 2016, 03:42:10 PM »
Thanks Steve and Ray and Graham. Vely Intelestink!  ;D
...bert

Offline paul

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Re: Water Cooled Bridgestone
« Reply #6 on: February 23, 2016, 07:49:34 PM »
Looks likes Jos Schurgers  home built  Bridgestone 125. If it is, it started life as a 175  dual twin. There's plenty of info out there if you go hunting. One question I have had , is why did  Schurgers call it a Bridgestone? Since there's not a lot of Bridgestone remaining after his remake.

Offline bsracer

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Re: Water Cooled Bridgestone
« Reply #7 on: February 24, 2016, 03:07:35 AM »
Looks likes Jos Schurgers  home built  Bridgestone 125. If it is, it started life as a 175  dual twin. There's plenty of info out there if you go hunting. One question I have had , is why did  Schurgers call it a Bridgestone? Since there's not a lot of Bridgestone remaining after his remake.

Probably because he worked for Kreidler and used Bridgestone 175 cases for the basis of his bike. He was not offered a factory ride with Kreidler but was given some "use of the facility". Came in third in the world championship and won the Belgian GP at Spa in 1973 . Custom crank, gearbox, frame and other parts including Kreidler modified cylinders and heads. 

paul

 


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