Author Topic: Yamaha RD350. The Model Guide  (Read 51198 times)

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Offline russiansteel

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Re: Yamaha RD350. The Model Guide
« Reply #15 on: November 16, 2014, 07:28:10 AM »
Quote from: SupeRDel
.....

1975/76. The last of the 350"s, most common in the UK in Silver.


....

Hi,
It just occurred to me with this photo, it has chrome fork dust seal and rear side reflector - I haven't seen them on any other RD's. Are they just random retrofit?
Any idea which model the dust seal covers are off, cos I wouldn't mind those one - I think they look sharp. (not so much the rear side reflectors though)
Thanks,
Sam

Offline RDnuts

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Re: Yamaha RD350. The Model Guide
« Reply #16 on: November 16, 2014, 03:21:06 PM »
the chrome covers are not standard on an rd they come off r5 ds7 the other side reflectors are again not standard ,pm me i have a nos pair of those covers , not cheap though  ;)
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 Alfie

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Re: Yamaha RD350. The Model Guide
« Reply #17 on: November 17, 2014, 12:52:49 PM »
Quote from: SupeRDel
.....

1975/76. The last of the 350"s, most common in the UK in Silver.


....

Hi,
It just occurred to me with this photo, it has chrome fork dust seal and rear side reflector - I haven't seen them on any other RD's. Are they just random retrofit?
Any idea which model the dust seal covers are off, cos I wouldn't mind those one - I think they look sharp. (not so much the rear side reflectors though)
Thanks,
Sam


Interesting this is a blue UK spec RD.

When I was a youngster a couple of my mates then (74 - 75) had Blue RD's so I think blue was an official colour for the UK.

 
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Offline RDnuts

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Re: Yamaha RD350. The Model Guide
« Reply #18 on: March 06, 2015, 07:18:29 PM »
dont take much notice of the photo regarding uk spec it says nowt , the regal blue is not an official uk colour , although does not mean that some might have come in via the back door, been covered in the other posts,dont you have any pics of your mates bikes back in the day?
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 5port

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Re: Yamaha RD350. The Model Guide
« Reply #19 on: February 25, 2016, 01:43:23 PM »
Nothing much in here yet about the European 521 (350) and 522 (250).  Think they came with the '75 model year and have the close ratio 6 speed gearbox that helped them be so good.  Certainly remember them being very good performers in the day.  Cheers
5port

Online 5port

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Re: Yamaha RD350. The Model Guide
« Reply #20 on: March 15, 2016, 10:11:14 PM »
Yes, the UK / European  1975 RD250B type 522 and RD350B type 521 were fitted with the closer ratio six-speed box, hi-top carbs and different cylinder heads.  Engine numbers started 522 for 250 and 521 for the 350.  Anyone know what the frame number started with on these UK/Euro 250B/350B?   Cheers
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Offline betty foRD

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Re: Yamaha RD350. The Model Guide
« Reply #21 on: March 17, 2016, 05:07:33 PM »
« Last Edit: March 17, 2016, 05:09:41 PM by betty foRD »
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Online 5port

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Re: Yamaha RD350. The Model Guide
« Reply #22 on: March 17, 2016, 06:54:22 PM »
Thanks Peter!  Nutty states that the UK/Euro 250B/350B came with engine and frame numbers starting 522 and 521.  That makes sense.  These were mechanically different to the USA 250B/350B in the carbs, cylinder heads, gearbox ratios (521 type close ratio) and their final sprocket sizes (ratio's).  Cheers   
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Offline betty foRD

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Re: Yamaha RD350. The Model Guide
« Reply #23 on: March 18, 2016, 10:20:16 AM »
Don't forget the exhausts, clocks, airbox, seat, plus mudguard transition on the later ones .....probably some more things if my recall was tip top...Lefthand switch gear pass button (or did that first appear on the A) ..then the introduction of the second carb difference ( 522 01) carb, with the casting used on later models but with the inspection port un drilled.

For me its what makes the 521 B so interesting, so much change for relatively few produced.

The model prefixes are of-course 521 and 522. VIN indexes generally start at X00100, the first 100 of any model being the preproduction prototypes. The first digit of the VIN index is typically used to identify year or geographic region.

I've always been curious to figure out how many 350 'B's came to Europe and in what VIN rage groups as generally all UK bikes have VINs in the 000100-002500. Some of the German ones were 1xxxxx but they also got some of the 0xxxxx. I've not seen a UK 1xxxxx.

One day I'll have a stab at collating a profile based on info that available, but right now its a struggle just to find a few minutes to get in the shed and tinker!


« Last Edit: March 19, 2016, 02:03:35 AM by betty foRD »
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Offline ozmadman

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Re: Yamaha RD350. The Model Guide
« Reply #24 on: March 18, 2016, 03:51:10 PM »
What are the differences in the carbs themselves (apart from the number on the casting) and cylinder heads between the USA and Europe models?  Also, the USA Spec 250/350 does not have a sidelight so the lighting switch and wiring is different
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Online 5port

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Re: Yamaha RD350. The Model Guide
« Reply #25 on: March 18, 2016, 05:49:12 PM »
Paul, the 522 carb differences from earlier 250/350 and USA "B" are: needles, slides, main jets and......air corrector feed from the airbox.  The cylinderheads might have different profile/ CR?  But, they do have a different casting with thicker dome, long thread plugs and, no cast-in anti fin-ring bridges, just rubbers. ;)
5port

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Re: Yamaha RD350. The Model Guide
« Reply #26 on: March 18, 2016, 08:04:55 PM »
Don't forget the exhausts, clocks, airbox, seat, plus mudguard transition on the later ones .....probably some more things if my recall was tip top...Lefthand switch gear pass button (or did that first appear on the A) ..then the introduction of the second carb difference ( 522 01) carb, with the casting used on later models but with the inspection port un drilled.

For me its what makes the 521 B so interesting, so much change for relatively few produced.

The model prefixes are of-course 521 and 522. VIN indexes generally start at X00100, the first 100 of any model being the preproduction prototypes. The first digit of the VIN index is typically used to identify year or geographic region.

I've always been curious to figure out how many 350 'B's came to Europe and in what VIN rage groups as generally they all have VINs in the 000100-002500. Some of the German ones were 1xxxxx but they also got some of the 0xxxxx. I've not seen a UK 1xxxxx.

One day I'll have a stab at collating a profile based on info that available, but right now its a struggle just to find a few minutes to get in the shed and tinker!

Cheers Peter!  Do it and post on here.  What can you tell me about the airbox differences please?

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Offline betty foRD

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Re: Yamaha RD350. The Model Guide
« Reply #27 on: March 18, 2016, 08:33:14 PM »
The airbox on a 522/521 has the two extra holes and grommets to accept the pipes from the carbs. The holes are not present and obviously not required on earlier models, but interestingly its another case of where the parts list doesn't match the reality...the 521 parts list shows the 360 part number but you can't use that directly because there are no holes ! It's easy to modify one to suit but that's not really the point.
To me the interesting thing is all the change detail that was never fully captured in published documentation. Ultimately its the enthusiasts who will identify the historic erratum and place in the public domain.





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Offline betty foRD

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Re: Yamaha RD350. The Model Guide
« Reply #28 on: March 19, 2016, 01:59:24 AM »
What are the differences in the carbs themselves

You could say truthfully that they were the first with a big pair of balls !

The balls being those that access the air jet, with much written about on here regarding their removal and replacement.
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Offline ozmadman

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Re: Yamaha RD350. The Model Guide
« Reply #29 on: March 19, 2016, 02:22:07 AM »
You could say truthfully that they were the first with a big pair of balls !
The balls being those that access the air jet, with much written about on here regarding their removal and replacement.
yes, no balls on my B
"Tolerance and Apathy are the last virtues of a dying society" Aristotle

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 1960 Model 8 AJS 350cc.