Author Topic: Updated carb technical spec  (Read 40791 times)

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Offline My precious

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Updated carb technical spec
« on: September 26, 2013, 11:57:57 PM »
Does anyone have  the full spreadsheet for the carb specs....?
Found the original on the old site but it appears to be incorrect for the 350B showing only the US/EU baffled filter spec.
As we know, there are many versions of carb settings for the B models. hi-top UK, low-top UK, rest of the world, baffled filter, un-baffled filter and all the undocumented factory upgrades that went on.............. A downloadable Exel spreadsheet for the full RD range would be useful as I have several carb sets I would like to sort, 522 hi-top, 522 low-top, 361 with a choice of either, baffled or un-baffled filters, 2R8 (but possibly the wrong needles)............
Taking in all the above, there seems to be possibly 6 factory set-ups just for the 350B, not just the one posted....
Can we get to the bottom of this and get it in a reference that others can choose exactly what workable set-up they can pick, dependent on the parts they have. I have enough bits to build at least 4 of the 350B variants at one time by chopping and changing. Currently running the hi-top un-baffled version at this time but will be reverting back to hi-top baffled set-up when I go back to standard, just need to track down a baffled filter.................  :-\
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 #1 on: September 28, 2013, 12:57:12 AM »
My original setup was 521 pipes, 522 high-top carbs, #2.0 slide, 5L3 needle, 105 main jets, 175-06 needle jet, baffled filter, air correction float bowls, 1 3/4 air screw.
Current setup is 521 pipes, 522 high-top carbs, #2.0 slide, 5L3 needle, 140 main jets, 175-06 needle jet, un-baffled filter, air correction float bowls, 1 1/4 air screw due to the F2 tune.
Both viable setups but I have seen/read of a low top version of the 350 and 5I4/2.5 set.
Is this an earlier version fitted to later bikes incorrectly by mistake or previous owners "tinkering" or some sort of bleed-over from other regions OR, imports?
What the end goal is to have a definitive spread sheet that members can refer to for a standard set-up dependent on their engine number, model number and location........... not currently done that I am aware of. Too much talk of needle position, Dale A and Dave Friest mods etc, what is the actual out-of-the-box setting for all the models to avoid the continued questions of what should be in there, and more of "this is what should be in there".............
All a bit grey, conjecture, and this is what I have at the moment. Needs the full details with all relevant info, eg, all of the above including float heights, needle clip position and what actual parts should be fitted to any RD carb as it came out of the factory. Only then, when you have the correct OEM setting, can you tinker with the original. This needs written in stone as to "this is where you start".
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 #2 on: September 28, 2013, 07:29:46 PM »
I'll confirm that about the needle jet by taking my original 522 carbs apart, they are actually off at the moment, it might be a mistake by me as I have been inside 4 different carbs in the last week............... Was working from memory and I see I got the air screw mixed up between the 2 filter types, but I always get that one wrong  ::)
I have a pair of 361 carbs as well that look original un-tampered....... but, who knows...... Only thing I will be absolutely sure about is my 522's as the only changes made on those were main jet, everything else is as it left the factory.
Will report back tomorrow as I have to go out to a Scout fund raiser and possibly drink beer, have spent all day flat out with the chainsaw.
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 #3 on: September 29, 2013, 01:03:39 PM »
Errrr, mystery solved, needle jet is 175-08, the 175-06 is in the 2R8 carbs.................. Everything is the same as you have up on the post.

Going to start documenting.
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 #4 on: September 29, 2013, 05:28:17 PM »
Yes, saw that, haven't come across 5J4 before, might be just a flaw in the stamp mark or a small mark or pit at the bottom of the I.......? Or, a bigger magnifier needed................. I actually use a jewellers 20x magnifier, you know, the one you actually put right up to your eye shaped like a small bucket with a lens on the bottom, works brilliant.

A bit like this one:

http://www.ebay.co.uk/itm/Jewelers-eye-loupe-magnifying-glass-NEW-10X-magnifier-/390659745946?pt=UK_Jewellery_Watches_WatchAccessories_SpareParts_SM&hash=item5af522a89a
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 #5 on: October 02, 2013, 11:08:41 PM »
Right, here is the proposed spreadsheet with some of it filled from what I am familiar with and believe to be correct....... possibly...... errrr.

Anyway, as you will see, at present it only contains the UK range with one exception in the Daytona as Dave C has so many of them..............  :D I can add any of the EU/US/CA/AU, etc if given all the necessary data and if I have missed any column titles, let me know.

Will post up new updates when I have entered enough data or am missing data.
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 #6 on: October 03, 2013, 12:52:00 PM »
Interesting - thanks, Stephen!

Colin
RD250A

Offline saddler

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Re: Updated carb technical spec
« Reply #7 on: October 03, 2013, 03:54:48 PM »
nice one Precious  :-\
you're only young once but you can be immature for ever

Offline miciver

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Re: Updated carb technical spec
« Reply #8 on: October 03, 2013, 04:40:31 PM »
Thanks Stephen- that is really interesting and of great help, especially as I am working on my 350 restoration currently!

 :)
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Re: Updated carb technical spec
« Reply #9 on: October 03, 2013, 06:02:52 PM »
We got there in the end Stephen  8) 8)
Just my 250 special left now !

Offline My precious

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Re: Updated carb technical spec
« Reply #10 on: October 03, 2013, 06:21:47 PM »
We did indeed........... thanks for persevering with me............  ::)

Anyway, I need input from other members to nail down the rest of the data, I have some but not entirely sure if it is correct.
Point me in the right direction to find where it is hiding or just post it up here and I will fill it in.
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 #11 on: October 03, 2013, 07:10:22 PM »
Interesting to see the B model float height is 16mm as a pose to the other round tank models 15mm (... if you find that sort of thing interesting, of course ;D).

I guess that would cause them to run a bit leaner; or am I wrong??

Has anyone fiddled about with float heights - does a 1 or 2 mm difference have much effect?

Colin
RD250A

Offline My precious

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Re: Updated carb technical spec
« Reply #12 on: October 03, 2013, 07:31:39 PM »
The B model had a different carb from the rest of the "round tank" series and the 2 main differences were the slides and the link to the airbox, I'm not sure if the air corrector jets were different, this is the only bit of info I am not sure of..... Both the above mods changed the way the air was delivered to the venturi and internals and must have required a "tweak" to the float height to bring things back to standard factory settings.
That would cut the fuel off 1mm sooner than the earlier carbs, but, honestly, not sure if it would make that much difference as you are allowed +/- 1mm and theoretically still be in spec.............  :-\
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 saddler

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Re: Updated carb technical spec
« Reply #13 on: October 03, 2013, 09:54:51 PM »
We did indeed........... thanks for persevering with me............  ::)

Anyway, I need input from other members to nail down the rest of the data, I have some but not entirely sure if it is correct.
Point me in the right direction to find where it is hiding or just post it up here and I will fill it in.


have you come across this link to the 'old' forum Stephen ?  ???

www.aircooledrdclub.com/smf/index.php?topic=39201.0
you're only young once but you can be immature for ever

Offline My precious

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Re: Updated carb technical spec
« Reply #14 on: October 03, 2013, 10:19:25 PM »
Yes, I did look at that but cannot trust whats there as the 350B one's which I do know, are wrong............
Wrong needle, wrong slide, wrong air screw setting, wrong float height.......
The 250B one's are totally mad, same issues as above but also wrong carb model and float height given as 23mm....  :o
Similar problems with the 250A, carb type, needle, air screw, float height.
I think " this is a combination of the EU and UK with some other stuff that's of unknown origin", so I can't trust the rest as being correct as there are so many mistakes.
What I need is the actual data from members that have un-tampered carbs and can report what is reality.
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