Author Topic: 1970 rd350 ??hi  (Read 1552 times)

0 Members and 4 Guests are viewing this topic.

Offline Gr8uncleal

  • Club Member
  • Port Hacker
  • Posts: 590
Re: 1970 rd350 ??hi
« Reply #15 on: November 15, 2019, 05:24:46 PM »
Yamaha called it "Stay, rear".

Don't buy the one for the later RD400 by mistake!

Online Astute Greaser

  • Club Member
  • Back Lane Scratcher
  • Posts: 289
  • Age: 62
  • Location: Bristol
Re: 1970 rd350 ??hi
« Reply #16 on: November 15, 2019, 05:30:52 PM »
Hi Splant
Go to this old thread showing the Vin plate and where date of manufacture should be. See Reply 7 & 8
http://www.aircooledrdclub.com/smf/index.php?topic=59439.msg470608#msg470608
Cheers
-Mike
ps
The (506) refers to the reign of the Japanese emperor
« Last Edit: November 15, 2019, 05:33:36 PM by Astute Greaser »

Offline splant

  • Club Member
  • Port Hacker
  • Posts: 506
  • Location: United Kingdom
Re: 1970 rd350 ??hi
« Reply #17 on: November 15, 2019, 07:10:18 PM »
Yes it was there but the cables have worn it away, no matter no u.s title so I'll be sending Paul photos for a dating cert eventually. Cheers
oops i think my powerbands snapped .

Offline 5port

  • Club Member
  • Port Hacker
  • Posts: 8180
Re: 1970 rd350 ??hi
« Reply #18 on: November 15, 2019, 07:54:54 PM »
Yes, sticker often peeling.  The rear sub frame is: 360-21645-00 "STAY, rear".  Breakers might call it allsorts!  ???

5port
5port

Offline RDnuts

  • RDnuts
  • Forum member
  • Port Hacker
  • Posts: 3759
  • Location: southampton
  • nuts about rds
Re: 1970 rd350 ??hi
« Reply #19 on: November 26, 2019, 07:51:23 PM »
no rds for 1970  i have an august 72 american model but know of a july 72 , so allow for the time they went on sale in the states a month or two many would have been sold around october  november , 72  although launch was 73, many bikes even today get made around 3/4 months get sold before official launch date , we had to wait untill september 73 before we could by one in the uk and by then the 74 model years would have been almost starting production , yamaha like may manufactures build in model years and often sold late in the preceding year, thinking logically the rd probably was designed around 1971 ish there wasnt much lead in time as the basis of the rd is already in the r5 ds7 range with not a lot having to be changed , also the rx350 pro and dx250pro  ( yr5 and ds7) japan market only got a disc brake so already on the cards for the rd to get them still cant work out why the 250 rd in some markets get a drum instead of a disc loads of theorys get flung about as to why in the same light as 6 speeds for rest of the world and 5 speeds for europe strange how markets differ 
RDnuts 18 RDs tooooo many even for me , the best things in life aint free, non fully paid up x member 2376 owner and restorer of the first rd to come to the uk RYN51L front page of april 2013 classic bike my claim to fame

Offline 5port

  • Club Member
  • Port Hacker
  • Posts: 8180
Re: 1970 rd350 ??hi
« Reply #20 on: November 27, 2019, 08:44:14 AM »
I certainly don't know why the 5-speed blocker was put in the Euro RD for '73/'74.  :-\  The gearbox is the 6-speed, just with the blocking type of pawl plate and the different sprockets to get top speed in 5th.  I wonder if there was some weird marketing thing, Suzuki were heavy on the Super-Six advertising.  Also, there was an early 70's period racing limit of 5 gears but, that was in the USA AFAIK so, how would that influence Euro sales?  Someone must know but, perhaps they are now dead!  :o

5port
5port

Offline RDnuts

  • RDnuts
  • Forum member
  • Port Hacker
  • Posts: 3759
  • Location: southampton
  • nuts about rds
Re: 1970 rd350 ??hi
« Reply #21 on: November 28, 2019, 09:58:17 PM »
yes it is a wonder strange thing is the 5 speed limit which in the states for racing but the rds got 6 straight out of the box, gimmick or no gimmick to go to the trouble of making a six speed box then blanking one off just does not make sense they did the same for two speed fizzys and just altered the sprockets to make them slow wierd
RDnuts 18 RDs tooooo many even for me , the best things in life aint free, non fully paid up x member 2376 owner and restorer of the first rd to come to the uk RYN51L front page of april 2013 classic bike my claim to fame

Online betty foRD

  • Peter
  • Club Member
  • Port Hacker
  • Posts: 2151
  • Age: 56
  • Location: Faringdon (Oxon)
Re: 1970 rd350 ??hi
« Reply #22 on: November 29, 2019, 09:21:27 AM »
My personal theory is that sixth in the USA was really intended to be used as an ‘overdrive’ useful if you have 200 miles of strait road and you are supposed to cruise at 55mph. You’d want max mpg. So having a sixth gear that can give you low rev cruising but which the engine can’t rev out on would then make sense. Of course you need to set rear sprocket appropriately..
« Last Edit: November 30, 2019, 02:40:00 AM by betty foRD »
Rev 'em till they rattle

Offline 5port

  • Club Member
  • Port Hacker
  • Posts: 8180
Re: 1970 rd350 ??hi
« Reply #23 on: November 29, 2019, 12:12:30 PM »
My personal theory is that sixth in the USA was really an ‘overdrive’ useful if you have 200 miles of strait road and you are supposed to cruise at 55mph. You’d want max mpg. So having a sixth gear that can give you low rev cruising but which the engine can’t rev out on would then make sense. Of course you need to set rear sprocket appropriately..

Yes, maybe.  However, the standard Euro/USA bike specs aren't like that.  The standard Euro 5 speed RD350 has .888 top gear with 16/37 sprockets.  That gives overall gearing crank to rear wheel 5.891/1.  The standard USA RD350 6 speed has .785 top gear with 15/40 sprockets that gives 6.006/1.  So that shows USA bike doing 6,006rpm crank at 1000rpm rear wheel and Euro bike doing 5,891rpm crank at 1000rpm rear wheel.  Close but, the USA standard gearing is actually lower geared in top due to those sprocket ratio's.   Cheers

5port
5port

Online betty foRD

  • Peter
  • Club Member
  • Port Hacker
  • Posts: 2151
  • Age: 56
  • Location: Faringdon (Oxon)
Re: 1970 rd350 ??hi
« Reply #24 on: November 30, 2019, 02:38:47 AM »
Of course you need to set rear sprocket appropriately..
Rev 'em till they rattle