Author Topic: Gtr or A7 (which is faster)  (Read 4244 times)

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Offline slawsonb

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Re: Gtr or A7 (which is faster)
« Reply #20 on: January 22, 2017, 03:33:30 PM »
Coulda been the rider too! ;D
...bert

Offline husker

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Re: Gtr or A7 (which is faster)
« Reply #21 on: January 22, 2017, 04:10:24 PM »
The Dec 1970 Cycle 350 comparison had the A7 at only 52.81mph at an indicated 60 with the GTR not much better at 54.60. No idea how consistent the speedometers were from bike to bike. My brother bought a 1970 A7SS new and he said it would run up to an indicated 110....Rod
1968 Bridgestone GTR350,  1971 Kawasaki A7SS, 1983 KZ750 LTD

Offline BRT-GTR

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Re: Gtr or A7 (which is faster)
« Reply #22 on: January 23, 2017, 07:41:54 AM »
              We're supposed to grow out of this 'who's got the fastest bike thing' , when does that kick in ? ;D :D ;D        You've got me at it now !! ::)

    UK tests were likely done with 140 mains and factory oil pump setting. The claimed 108 max in MM is unreliable. Text doesn't mention it. Had they actually hit 108 on a  timed track, I'm sure it would have been shouted long and loud.
        Pictures were taken near Bill Smiths shop in and around Chester, his and my home town. Where was test run, local bypass? Had they gone out to nearby Oulton Park race track , surely there would be a picture. Would also have cost. I think the speed figures were supplied by Smith, the importer, looking to encourage more dealerships and sales. Where's Graham Weeks when we need him. RIP

      Having said that, Richard of this site, stated in an early post that, 'some GTRs were noticeably better/faster than others' but not why.

   There is some other critical factor on our engines/bikes that significantly affects and varies performance, bike to bike.        37hp should be good for 100mph on the road, just. Many race bikes achieve it on far less (low frontal area and fairing).     Our tall bike and high bars don't help.
     Optimum state of tune should be reproducible but doesn't always give expected performance result, from experience. (it does, however, smooth out the engine, which will run like a turbine when you get it right as attested in the Cycle World comparison).
       Production tolerances another factor but where? ........... I would put forward, piston fit and barrel clearance, more critical on a 2S and will pay close attention on next engine rebuild. 
     Any other suggestions, you racers ?  Disc valve fit or seal ?                               Brian.
 
« Last Edit: January 23, 2017, 09:43:56 AM by BRT-GTR »
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Offline OldSwartout

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Re: Gtr or A7 (which is faster)
« Reply #23 on: January 23, 2017, 08:40:55 AM »
The Dec 1970 Cycle 350 comparison had the A7 at only 52.81mph at an indicated 60 with the GTR not much better at 54.60. No idea how consistent the speedometers were from bike to bike. My brother bought a 1970 A7SS new and he said it would run up to an indicated 110....Rod
It was pretty common for speedos from that era to be pretty optimistic, not just bikes, but cars, too.  My 350 shows an indicated 100 mph at somewhere around 75 mph. That's with a  NOS replacement speedometer I purchased from Richard several years ago.  I replaced the original because it was wildly optimistic, the NOS one is just as bad (although much nicer looking). These days, it's easy to get an accurate speed, just carry a GPS unit or an app on your phone.  I actually put a digital bicycle speedometer on mine. It works at normal highway speeds, but seems a little flaky at high speed. They only cost $10-$15, though.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline farmerdl

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Re: Gtr or A7 (which is faster)
« Reply #24 on: January 23, 2017, 09:57:34 AM »
I won't say how I obtained the information, but police radar of the early seventies put the top speed of a certain GTR at 104mph.

Offline slawsonb

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Re: Gtr or A7 (which is faster)
« Reply #25 on: January 23, 2017, 10:13:46 AM »
That pretty closely matches my 101 in the traps at Del Ray.  ;D
...bert

Online moonpup

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Re: Gtr or A7 (which is faster)
« Reply #26 on: January 23, 2017, 10:31:28 AM »
102 (per speedo) on my GTO back in 1971 on I-90 heading to Sturgis...  ;D
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline BRT-GTR

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Re: Gtr or A7 (which is faster)
« Reply #27 on: January 23, 2017, 11:35:19 AM »
                    Aaaaawwwhhh !     Go on DL tell us  ;D ::)    gowon, gowon, gowon.  ::)

       Never saw more than 90 on my speedo but did seem to be moving quick............ Had 140 jets and factory pump setting, didn't clear properly to 7500, fluffed out at maybe 6500. 130s never came to UK, didn't have the know-how to mess with the pump.
           
      Can't wait to get GTO nicely run-in and see what she can do, now I have the knowledge..............  Might kill myself but go out with a big grin on my face. What could be better  ;D :D ;D 8) :o..................Whooooa, take it easy, Brian.  :(
« Last Edit: January 24, 2017, 08:17:41 AM by BRT-GTR »
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Offline srpackrat49

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Re: Gtr or A7 (which is faster)
« Reply #28 on: January 23, 2017, 11:37:28 AM »
Well back in the day ;D ;D ;D   june of 1968 :o :o :o  one dame week out of highshool ???   i get my draft notice.....SHIT.... got pissed... comeing home from my now x..... i,m on my 175 DT that the folks over in Rockford had played with... light goes green... i hammer down.. going threw the gears... i didnt see the cop till i was hitten the ton.....  got busted for 60 over the limet :P   and went to jail that nite.....  And yes ;D  i did have the fastest bike in school 8)

Offline farmerdl

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Re: Gtr or A7 (which is faster)
« Reply #29 on: January 23, 2017, 03:10:37 PM »
Well Brian, if you must know, it involved handcuffs and not in a fun way.

Offline slawsonb

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Re: Gtr or A7 (which is faster)
« Reply #30 on: January 23, 2017, 03:41:05 PM »
Almost....too much information, dude! ;D
...bert

Offline BRT-GTR

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Re: Gtr or A7 (which is faster)
« Reply #31 on: January 23, 2017, 05:26:55 PM »
            Cheers, DL, lets leave it at that. Bad luck.   Was that the same high number bike that you have today.                Brian.
« Last Edit: January 23, 2017, 05:37:10 PM by BRT-GTR »
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Offline farmerdl

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Re: Gtr or A7 (which is faster)
« Reply #32 on: January 23, 2017, 06:47:19 PM »
I don't have that bike today.  I bought that one new in '70 and traded it in on a T500

Offline husker

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Re: Gtr or A7 (which is faster)
« Reply #33 on: January 23, 2017, 10:22:23 PM »
DL and Srpackrat wouldn't happen to still have those tickets. Could start a new tread (Traffic tickets received while riding a Bridgestone!)
1968 Bridgestone GTR350,  1971 Kawasaki A7SS, 1983 KZ750 LTD

Offline paul

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Re: Gtr or A7 (which is faster)
« Reply #34 on: January 24, 2017, 10:00:29 PM »
That ticket question needs to be posted, so all our members could see it and respond.

 


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