Author Topic: Pre production RD350  (Read 1223 times)

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Offline Gr8uncleal

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Re: Pre production RD350
« Reply #15 on: September 11, 2020, 04:44:26 PM »
Is there a place called France in Australia, is the info on your avatar wrong!!  :D :D :D I can't speak Australian either!  :D
Yam RD200DX (Gr8auntiepat's)
Yam FZX700 Fazer
Yam RD400 bitsa
Yam RD350B rough
Yam RT2 almost finished
Yam DT360A almost finished
Suzi GT550J just started
Suzi 1250 Bandit regular rider
Yam RD125B (probably!) now being reassembled
Yam AS3 in boxes

Offline Chrispy

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Re: Pre production RD350
« Reply #16 on: September 11, 2020, 05:06:15 PM »
No, I just live in Aus for half the year and in France (the wife is French) for the other half, so two summers!!

To speak Stryne you just have to swear a lot!!

I joined the forum because I had just bought this in Aus. Then I managed to get out to Europe and fancied the 350 as well.



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  • Peter
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Re: Pre production RD350
« Reply #17 on: September 11, 2020, 05:16:57 PM »
Initially I dismissed the possibility of the paint job being factory...principly because it doesn’t look factory !
BUT the more I think about it the more it seems a possibility. If it was a development bike rather than a Marketing bike then they would have wanted it to be off the radar a little, disguised from peeping eyes.
The back face of the oil tank is probably the best place to check...pretty obvious if it’s been sprayed aftermarket.
But even if the spray tells don’t look factory , it still could have been done in the R&D area...
I’m trying to see if the colour is on that registration document...but some trouble scrutinising ze papers.... :D
Rev 'em till they rattle

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  • Peter
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Re: Pre production RD350
« Reply #18 on: September 11, 2020, 05:26:12 PM »
Can you show us pic of the engine number or confirm that was stamped first time around not overstamped ?
Rev 'em till they rattle

Offline Chrispy

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Re: Pre production RD350
« Reply #19 on: September 11, 2020, 05:45:59 PM »
Both Engine and frame numbers were overstamped. Both matching originally and after.

Having been involved with the Press cars garage at Jaguar, the initial launch of the year modal and with the press it might just have been a taster of what the bike would look like in JPS colours which were all the rage at that time. If the press didn't like it then no. I've found the guy who bought it from Yamaha Austria who is still an Ophthalmologist in Vienna at the same address so I will write to him and ask what colour the bike was when he bought it.

From what I can see f the oil tank, RHS cover and the bottom of the tank it was never a different colour.


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  • Peter
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Re: Pre production RD350
« Reply #20 on: September 11, 2020, 07:56:07 PM »
Fascinating, and a great bit of the RD350 story.
Whatever you do m don’t go messing with it too much. Sensitive clean up etc .
If you want it in other colours just get a second paint set. Personally though I’d keep it pretty much exactly as it is. Authenticity and provenance always emerge as the most sought after attributes.
Rev 'em till they rattle

Offline 5port

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Re: Pre production RD350
« Reply #21 on: September 11, 2020, 08:25:10 PM »
The engine differences can be proved if you check certain things.  I don't think you confirmed the carb or cylinderhead ID numbers?  Also, the gbox status can be confirmed with some cog teeth counts and other checks.  As Peter says, don't mess it about, it is a great historic machine.  Quite a few people could pay well over the normal odds for that.
Another thing is, although the motor is not complicated, it takes good knowledge and experience to put it back together as good as Yamaha built it.  ???

5port



 
5port

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Re: Pre production RD350
« Reply #22 on: September 11, 2020, 10:07:09 PM »
Chris, I think the gear box is B because it’s showing 6 speeds on the decal of the gear change.
Unlikely that it’s just cosmetic as this bikes seems to be a R&D spec...not just a brochure build...which ironically tended to be the other way...B paint set but A bike..
Rev 'em till they rattle

Offline 5port

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Re: Pre production RD350
« Reply #23 on: September 12, 2020, 07:22:00 AM »
Hi Peter, yes saw the label.  Most likely it is a 6-speed but my question would be if it has a 521 CR gbox or the older wide 360 ratio's?
Cheers

5port
5port

Offline Chrispy

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Re: Pre production RD350
« Reply #24 on: September 12, 2020, 10:37:06 AM »
Hi 5port,

The bike will be staying the same, just clean and tidy and get the motor running again. Unfortunately there is no mention of the colour on the paperwork

I've attached the photo's of the heads, carbs, and the gearbox.


Offline CBM

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Re: Pre production RD350
« Reply #25 on: September 12, 2020, 11:13:25 AM »
You missed a trick there Chrispy, you should of posted that you're going to chop the rear sub-frame off and turn it into a Hipster's dream machine  :D :D :D

Offline 5port

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Re: Pre production RD350
« Reply #26 on: October 01, 2020, 04:48:55 PM »
Sorry, missed the photo's!

The head.  Interesting, machine cut, not a standard bowl.  The "H  21.9" stamp is likely the flat chamber volume in cc.  Standard, but not usually marked.  A pic of the whole bottom face should show more info.
Carbs are earlier version.  Not surprising.  However, the paint is not original. The original paint does not peel in that way, you do get fuel lifting it but, not like that. 
Gearbox has had crappy ATF in it but looks fine.  Very difficult to tell the ratio's from a pic that doesn't show whole gears.  How many teeth does the gear nearest the chain sprocket have?   ;)

Cheers

5port
5port

Offline 5port

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Re: Pre production RD350
« Reply #27 on: October 01, 2020, 04:52:12 PM »
BTW, that head only looks to have run a few times since it was new/cleaned.

5port
5port

Offline Chrispy

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Re: Pre production RD350
« Reply #28 on: October 02, 2020, 02:22:36 PM »
Hi 5port,

I'm afraid the time for counting the teeth on the gears has gone. The engine is halfway back together.

The crank has been replaced with a new one. In addition to the lead weight issue, when I took the crank out it fell in half. The splined section in the middle had movement in it and was loose. So after sending it to a specialist in Dijon they confirmed that it would be cheaper to fit a new one.

I got one from the USA (unbelievably it arrived in four days!) It's one of these

https://www.vitosperformance.com/product/yamaha-r5-models-a-b-c-1970-1973-crank-assy-with-o-pcrd350-1

Fitted perfectly and looks very well built. Time will tell.

The paint The little still attached) has been removed from the carbs and they will go back on unpainted and with new rebuild kits in them (came with two sets of needles etc so someone has messed about to try to get them right, but with the altitude in Austria??) To do a proper job they would have to be etch primed then sprayed. Maybe later when I'm bored?? But for now I can live with them "au natural"

Just received a new clutch kit after I found one of the plates was cracked, so back to the build tomorrow.


Offline 5port

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Re: Pre production RD350
« Reply #29 on: October 02, 2020, 03:37:00 PM »
OK.  The gearbox looks to be the normal 250/350A/B with a 24T 5th gear but, you cant tell now!  :'(
Carbs will be fine.  Say if you need the settings, depends mostly on the filter.
Head looks interesting to me, it has been reworked by someone.  Usually there are other casting marks and id.
I think the crank should be fine.  Please keep us updated.
Cheers

5port   
5port