Author Topic: Updated carb technical spec  (Read 56484 times)

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Offline saddler

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Re: Updated carb technical spec
« Reply #15 on: October 03, 2013, 11:14:45 PM »
 :D I hope 400C is correct mate I've recently set mine up using that info  ::)
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Offline My precious

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Re: Updated carb technical spec
« Reply #16 on: October 03, 2013, 11:24:34 PM »
Hmmmmm..... wouldn't bet the farm on that being correct either..............  ::)
So many people with carb problems........... think I've got to the bottom of it. The wrong info is out there, a bast@rdization of more than one area and some "made-up" stuff it seems.
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Offline My precious

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Re: Updated carb technical spec
« Reply #17 on: October 04, 2013, 12:20:27 AM »
Well............ we know where some of those crap parts come from.........  >:(
If you are not in a hurry, OEM stuff is still to be got in the US, so, I pre-empt this by purchasing certain items in advance.
You may have seen my recent purchase of a pair of original Dykes 360 pistons for $29 each (£18). Sort of a real piss-take by JT's looking nearly £100 for one piston  :o
We can sort this bit anyway if I can get the necessary info back from members.
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
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Offline My precious

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Re: Updated carb technical spec
« Reply #18 on: October 07, 2013, 12:59:56 AM »
What a nightmare this is turning out to be.............. After EXTENSIVE research, on-line, current posts in the new forum, tech data in the old forum, studying the Yamaha workshop manuals, the supplementary manuals and referring to the following carbs I actually have, 361-G1, 361-G3, 522-00 (x2), 2R8-00), a certain amount of "Poirot" detective stuff later..... I have updated the A/B and 2R8/9 data.
It seems that the carb suffix code is vitally important, eg, what comes after 361 or 2R8 on the choke body. Seems that there is a unique set of carbs produced for the UK that runs with baffled filters. Basically, if you have a UK bike, with the original carbs, you have to have smaller jets, a 2.0 slide and a short needle. If you change to an un-baffled filter, it is NOT a simple case of re-jetting, you have to change the slide and needle as well (needle in the case of the earlier 250/350, slide only in the later bikes). In the same light, you can't just "bung on" any carb bits you happen to have lying around, there may be a different set of air corrector jets in the different carbs, I haven't got to the bottom of whether this the case yet.
Early (low) suffix numbers are for the "rest of the world" and any superseded numbers are for the UK............ except the 522-00, as it was possibly specifically produced for the UK and the rest had the 361.............. maybe.................

This may or may not be definitive, unless someone has actual bikes with un-tampered carbs that are genuinely UK or rest of world and can genuinely and categorically state that "this is what is in mine out of the factory"....? I can only genuinely state with hand on heart that the 361-G3 and 522-00 are as-is.....................

Latest update here:

350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
Member 380

Offline JRD

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Re: Updated carb technical spec
« Reply #19 on: October 07, 2013, 06:43:09 AM »
Sounds like you have your work cut out.

I picked up what I hope are unmolested carbs from a 350 here in Oz from the local wrecker.

FYI

Carb ID is 360-02 Hi Tops
2.5 Slide
5I4 Needle Clip in 3rd groove
175 type 0-8 Needle Jet
25 Pilot with number on head (slot end)
Main Jet 170
Float arm "A"
Air Screw 1 3/4
Reality is an Illusion caused by lack of Motorcycles
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Offline My precious

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Re: Updated carb technical spec
« Reply #20 on: October 07, 2013, 06:08:22 PM »
Would agree with that, the rest looks about right but the main jet is not............... now......... another carb rears it's head  :-\
360-02.
What's it off I ask? 350A or 350B, obviously different set for AU/NZ, hi-top would suggest B model but the 360-02 number suggests the non-letter or A model. Do the float bowls have the large air correction tube barbs to the airbox and the brass ball blocking the airway at "6 o'clock" in the intake?
Any of the other 350's with either slide/needle combo have the needle in the 4 groove, with the 250 having it in the 3rd, but, you have the long type 2.5 slide normally used in the US.
What's in the bike you've got now?
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
Member 380

Offline Colin987

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Re: Updated carb technical spec
« Reply #21 on: October 07, 2013, 06:41:57 PM »
Hi Stephen,

of the six carbs fitted to my German 250A's (model 352), five are stamped 361G1, and the other (right hand) one is stamped 360G1, for some obscure reason!

Colin
1974 RD250A
1973 Garelli Rekord

Offline My precious

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Re: Updated carb technical spec
« Reply #22 on: October 07, 2013, 07:44:02 PM »
OK, thanks, from that is seems that the non-letter and A models were the same in both UK and EU and only went all complicated from the B...............  ::)
Bit of a mystery with the 360-G1, where does that come from? Obviously, the right carb is different in that it has no choke but I've never saw 2 different code ones on the same bike as standard  :-\

Will update that unless someone knows different.............. ?
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
Member 380

Offline Colin987

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Re: Updated carb technical spec
« Reply #23 on: October 07, 2013, 07:50:19 PM »
Bit of a mystery with the 360-G1, where does that come from? Obviously, the right carb is different in that it has no choke but I've never saw 2 different code ones on the same bike as standard  :-\

Don't do any updating with my data.....   I think all my bikes have had a dubious tampered-with history!  :o

Colin
1974 RD250A
1973 Garelli Rekord

Offline My precious

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Re: Updated carb technical spec
« Reply #24 on: October 07, 2013, 08:09:54 PM »
It's fairly conclusive that 3 of your 352 model bikes have 361-G1 (well, almost), and as the UK 361 model also has this setup, it looks like there has been a simple run-through of the carb up to the baffled filter A model. But, it is curious though that all of your 352's are running a carb, which, effectively is off a later model.................... how does that work  :-\
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
Member 380

Offline Colin987

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Re: Updated carb technical spec
« Reply #25 on: October 07, 2013, 08:19:31 PM »
Just had a closer look... with a magnifying glass! :-[

My "odd" carb would appear to be a modified 360 - the "0" has been crossed-out and re-stamped "1".



(Hell; this must be boring for other readers!)

Colin
1974 RD250A
1973 Garelli Rekord

Offline My precious

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Re: Updated carb technical spec
« Reply #26 on: October 07, 2013, 08:40:33 PM »
Ah..... a factory upgrade.........  :D Crossover model probably when the model this went on finished and they used up old stock. Hey! maybe it is a valuable collectors item worth a fortune, like stamps that had mistakes that got out into the wild....  :o
Yes, must be like paint drying for some, but, a lot of members will benefit.
Still want to find out what a 360 is off, orrrrrrrrrrr is it a mistake altogether and there was never a 360 carb?
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
Member 380

Offline JRD

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Re: Updated carb technical spec
« Reply #27 on: October 07, 2013, 09:21:46 PM »
I'll double check the brbs tonight (i'm at work checking this posting)the box at the wreckers said RD350.
Its sounding like a definitive spreadhseet would be a god send!!
Will slip in a photo but  I believe there is a ball in the carb mouth at 6 o'clock
as I did notice one of them has a gouge mark - just wonder if someone had had a go
at getting them out or maybe it was just dropped at some point.

Can you clarify the needle clip positionsyou quote 1 is at the top of the needle 5 at the bottom - so position 4 is
one notch richer than centre?

The bike originally came with a 250 tuned top end but was a 350 bottom end - not the norm.
The carbs were low tops and I didn't take a lot of notice of their settings at first as they
went on my 250LC race bike until recently. I think I have the settings written down in the book.

the otherset of Hi tops came from a mate and have had the Dave Freist mod and were originally set up for
a 400 race bike but I'll check the body stampings.
Reality is an Illusion caused by lack of Motorcycles
TZ750E,  TZ250 3YL
Spondon LC370, LC250 Special
TZR250 2MA F3, TZR250 3XV SP
TZR 250 3MA (all Race)
RD350A, RZ350, DT250

Offline My precious

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Re: Updated carb technical spec
« Reply #28 on: October 07, 2013, 10:14:57 PM »
I actually have in my possession a pair of 2R8 carbs that are in the spec on the sheet that came off a mate's 250E when he totally modded it after a crash and went full cafe racer with different carbs, that's how I ended up with them.
From that and my research I assumed that there was a baffled version for the 400 as the jetting of the 2R8 suggested that there was when you compare it with the un-baffled 115/145 version, but, no confirmation. So, what is the 2R8-10, 95 main, 5L1, 175-06, 2.0 slide, 22.5 pilot off............?

Wasn't able to get confirmation on the filter type on the C/D so that's why it was left un-finished, along with the rest of the jetting data. I'll take that out bit out and hunt down the rest, unless you know it and I can fill all that gap in?

I couldn't track down definitive written proof that A's had a hi-top set-up, any that I have seen have been the black carb body but with the alu finished low-tops. Hence the entry in the EU spec for the A model until definitive data has been received. If you know the full spec and that the A's were all fitted with them I can update that as well.

The 522-00 carb was put down as being UK only as it is un-documented and the only time I have heard mention of it is on UK bikes, never anywhere else. From my research, the 5L3 was also in the 250D so that is probably how he was able to get one.

We have a bit to go yet on this..... project.
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
Member 380

Offline My precious

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Re: Updated carb technical spec
« Reply #29 on: October 07, 2013, 11:08:55 PM »
Yes the 2R8-10 carbs are definitely jetted for baffled filter and off a UK bike.

Was inputting that data and spotted you have the same 5L3 needle for both, from 2 different sources I have got 5L1 in the 400C/D, but only confirmed for EU and Canada....... did the UK run the same needle?
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
XJ6S Diversion (2010)
Yamaha R1Z 3XC 250cc power valve (1990)
Member 380