Author Topic: Updated carb technical spec  (Read 42704 times)

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Offline My precious

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Re: Updated carb technical spec
« Reply #120 on: November 15, 2018, 11:51:31 PM »
Thanks and thank you to iranana for the info, I'll add it to the next update, I've got a good amount of info lately, Neil and Peter have sent me a load of carbs and I continue to learn new stuff, especially when they can tell me exactly where the carbs came from and I can tell if they have ever been opened or tampered with. I've had 5 new air cooled versions and LC / 31K carbs too.
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Offline mervin

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Re: Updated carb technical spec
« Reply #121 on: October 07, 2019, 08:31:25 PM »
latest update from Stephen

* RD-Standard-Carb-Specs-A4-3-latest.pdf (48.89 kB - downloaded 47 times.) 

A tidier version

* RD-Standard-Carb-Specs-A4-3-latest 2.pdf (284.47 kB - downloaded 27 times.)
« Last Edit: October 09, 2019, 08:30:23 PM by mervin »
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Offline stukey

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Re: Updated carb technical spec
« Reply #122 on: October 07, 2019, 09:44:47 PM »
The amount of time and effort stephen has put in to this data sheet is imeasurable and will help a lot of people with clear  precise information for years to come, going forward. To have been just a small part in this is an honour and getting  restored carbs back in better than new condition is a real win for me. Well done mate :) :) :)
« Last Edit: October 08, 2019, 06:37:37 AM by stukey »
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Offline Motty

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Re: Updated carb technical spec
« Reply #123 on: October 07, 2019, 11:10:35 PM »
latest update from Stephen

(Attachment Link)
Thank you for the update Stephen

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Offline Kickstart

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Re: Updated carb technical spec
« Reply #124 on: October 16, 2019, 11:34:21 PM »
yea, thanks Stephen for taking the time to help others. great info
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Offline RDnuts

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Re: Updated carb technical spec
« Reply #125 on: November 01, 2019, 08:02:30 PM »
the chart is showing the r5 float valve as being 4, this is not correct it should read 2 cheers now
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 My precious

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Re: Updated carb technical spec
« Reply #126 on: November 01, 2019, 08:23:12 PM »
I had 3 pairs of R5 carbs and they all had 4.0 in them.....?
350B money-pit, feckin broken again............... (1976)
250A project (1975)
TZ350D/RD350B Hybrid Spondon (1975)
Ducati 916 (1997)
VFR400 project (1987) sold.
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Offline RDnuts

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Re: Updated carb technical spec
« Reply #127 on: November 01, 2019, 08:43:00 PM »
yes but not standard part number tells you the size ends in 20 meaning 2 many carbs get altered from previous  owners number 4 i would have thought would let in loads of fuel probably used for racing sprinting etc have a few 278 carbs here all showing 2s  parts books show number 2, genuine service manual tells you also, trouble is you cant take for what you see in a carb as correct , i have just bought from japan an rx350 pro basically an r5with a disc brake at the front a very rare find indeed watch this space as it get put back to its former glory carbs showing #2 float valves
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 My precious

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Re: Updated carb technical spec
« Reply #128 on: November 01, 2019, 08:54:48 PM »
The Yamaha tech sheets cannot be taken as the Bible, there were loads of mistakes, dealer updates that weren't available to the public, undocumented part changes, transition parts that had a later casting but with earlier parts in it, bits that were identical on the outside but different on the inside..... I no longer trust anything Yamaha put on paper and go with taking apart dozens of components and building a database from that, the switches are no different, lots of changes in the later coffin tank models that are internal, needs loads of reference parts to figure it all out. And I know what I'm doing.....
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 RDnuts

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Re: Updated carb technical spec
« Reply #129 on: November 01, 2019, 09:17:15 PM »
whos disputing you know what your doing ?  but your wrong if your using the findings of old carbs to put in stone for others to follow ,loads of mistakes happened at yamaha thats why they issue memos to dealers and workshops to correct any,  if you think about it in an engineers prospective why would you use #4 float valves when all the rest use #2 or 2.5 the 3 carbs you have probably came from the same source were they on a bike? in a bucket of carbs? in bits , etc you know the score have you ever owned an r5? i know the time it takes to compile a list and in the fog of loads of data its easy to make a mistake there are other errors in there but after your reaction to this post i wont bother pointing them out we all know what we know and sometimes best kept that way , I merely pointed out an error and then get chewed about it, correlating data is no easy task but verifying its accuracy if even harder anon . ps id just like to add with the new modern fuels and next year 10% ethanol coming sadly all this data will become irrelevant i can see hard times ahead for all of us with these machines we gonna have to work hard to keep our machines on the road
« Last Edit: November 01, 2019, 09:28:40 PM by RDnuts »
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 My precious

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Re: Updated carb technical spec
« Reply #130 on: November 01, 2019, 09:27:14 PM »
One pair came off a bike, 2 didn't, one of those had never been been apart, you can tell if a carb has been apart when you have serviced over 100 Rd carbs, and I have a mate who has a low miles R5 with known history I fettle.... Its all about hands on stuff which you also have but thats what has come out here. And I am an engineer......
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 RDnuts

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Re: Updated carb technical spec
« Reply #131 on: November 01, 2019, 10:12:45 PM »
your mate with the r5 whats sitting in the carbs? ah yes the old im an engineer so i must be right argument, I worked at Ford motor company 30 years making transit vans I lost count of the engineers coming and telling us this should go this way and that i had a simple message  for them come on the line and show us how it is done none ever did seeing a drawing and assembling something are two different things at 30 vans an hour the operator knew how to do it an engineer thought he did, now im not knocking you in any shape or form but sometimes engineers see things in a different way sometimes overthinking things clever at somethings dunce at other tasks , it also depends on what type of engineer your ace at ,ive met many different fields of engineers as you cant be a jack of all the best ones i come across are those that got there hands dirty who had a sense of mechanical ability and knew how to use a spanner and had the knowledge not only from a book but real world learning id like to think your in that zone, learning comes from errors we all make them its how we learn from them, how we might think what we saw might be wrong, i have some brand new 522 carbs here in their boxes also some 2r9s  would i just fit them hoping all is correct in there ,no of course not ill have to take them apart just to check , i know that main jets are often wrong in new carbs so the first port of call , and to find a carb that is not new thats never ever been apart well your one lucky fellow as i never have , lost count how many i have done but must be well over 1000 and counting , please tell me if the carb in question was painted?  again dont take things the wrong way , and for the record did i not supply some of your data a long time back ? pretty certain i did
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 My precious

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Re: Updated carb technical spec
« Reply #132 on: November 01, 2019, 10:34:58 PM »
I stand by my findings....
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 RDnuts

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Re: Updated carb technical spec
« Reply #133 on: November 01, 2019, 10:53:04 PM »
i stand by facts and insider knowledge gained over 45 years and even then i dont profess to know it all and i never will but im over your neck of the woods early next year id still buy you a beer and talk shop
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 twostrokelooney

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Re: Updated carb technical spec
« Reply #134 on: November 02, 2019, 09:44:04 AM »
I have an update I'm working on for the data sheet, I've got my hands on a lot of carbs recently and have made a few additions and some changes.

Good to see you are working on that Stephen.  Your carb data sheet is a great resource!  Thanks

5port
Here..here!!!  many thanks Stephen, all your hard work is a gold mine of information. And.... good to see you back on the forum  ;) ;)

Couldn't agree more with the sentiments above and good to see you out and about again Stephen...... :)
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