Carb Diaphragms

[CA.XSer]

Found this on Ebay, He has 70 of the diaphragms for a XS750. The part number is the same for the XS1100 from what I can see.

Check it and add what you think. Anybody know this seller?

I maybe able to buy a bunch and spread them around if anyone is interested.

Can't seem to copy Address at Ebay, below is

Item number: 2464050006

[oldnortonrider]

These guys are legit. I just took a "tour" of their
Ebay store site. They have a "power seller" rating with EBay.
Doubt if they would jeopordize that, after 311 Ebay sales.
Located in Greece. Worldwide sellers.
Their EBay store site address > http://members.ebay.com/ebaymotors/w...serid=vespa720

[Jerry]

Part numbers are not quite the same. The XJ fiche and SH fiche show the diaphrams as part number 3H5-1490-00-00, the listing is for 2F3-1490-00-00. Any carb gurus know the difference?

[uk1.1s]

Other sources

If anyone is worried about not getting the right replacement type - a company called NRP in the UK provide replacement carb rubbers for loads of 70's / 80's bikes.

They are based in Manchester England - I used them for replacing all 4 rubber diaphragms last year and it did make quite a difference.

I'm not an employee or mate of NRP - just a happy customer

Have a look here:

www.nrp-carbs.co.uk

Just tried the link - watch out for the search engine... try typing in Bike Type: Yamaha
Model: (Leave Blank)
Parts: All

Doesn't seem to pick up XS1100 as a model (maybe too clever with xs1100E and XS1.1S etc listed).

[randy]

WOW! 31 british pounds for one diaphram is about $60. Without the slide, it's not as good a deal as Part 'n More at $50.

Randy

[John]

Originally posted by Jerry
Part numbers are not quite the same. The XJ fiche and SH fiche show the diaphrams as part number 3H5-1490-00-00, the listing is for 2F3-1490-00-00. Any carb gurus know the difference?

It would almost seem that the 3h5 p/n would be for the later model carbs that have the preset needles, and the 2f3 p/n would be for the older carbs that have the grooves on the needles for making adjustments to the needle settings. The 80-81's and the XJ carbs have the preset, non adjustable needles, and the 78-79 have adjustable needles. Just my guess though.

[Jerry]

Early/late carbs sounds right...I just checked the '79 fiche, and the diaphram is listed as part number 2F3-1490-00-00.

[oldnortonrider]

A few years ago, I had 3 sets of Mikuni carburetors disassembled
on an eight foot table, here in my apartment, all apart at same time. 4 carbs off of an '81 XS1100 Special, 4 carbs off of a '79 XS1100 Standard, and 3 carbs off of a '79 XS750 = 11 carburetors . The slides and diaphragms were all the same, using same type needle with 5 different adjustment notches for the clip.
...............................
............some of the screw-in brass jets were numbered differently. Different sizes. All the other internal workings, looked to be the same, on "that" particular bunch of carburetors..........

[rover]

Re: Carb Diaphragms

Originally posted by CA.XSer
Found this on Ebay, He has 70 of the diaphragms for a XS750. The part number is the same for the XS1100 from what I can see.

Check it and add what you think. Anybody know this seller?

I maybe able to buy a bunch and spread them around if anyone is interested.

Can't seem to copy Address at Ebay, below is

Item number: 2464050006

I checked out the numbers, and they will fit 79 XS1100 all models. They are still at $16.00. How does one go about bidding on them? If you win, do you have to take them all, or can one get four of them? I am registered on ebay, and have made several purchases, but never have bid on multiple items. I have to check the numbers for an 81 Midnight Special, as I also have a set of those carbs that could use new diaphrams. Hope someone can tell me how to go about getting 4 or 8 of them Thanks, Rover

[CA.XSer]

I have to check the numbers for an 81 Midnight Special, as I also have a set of those carbs that could use new diaphrams. Hope someone can tell me how to go about getting 4 or 8 of them

A 81 Special takes a different part number. 3H5-14940-00-00

If you go to the bottom of the Ebay page on the left side you will see a link called Multiple Item Auctions .

[Jerry]

eBay multiple item auctions....you enter the price you are willing to pay for Each item, then the number of items you will buy at that price.

Fewer than 70 units receive bids = sale is at opening price, regardless of bid amounts.

Exactly 70 units get bids = sale is at the 'average' bid for all 70 units

More than 70 units requested = sale at 'average' bid, but highest maximum bids get filled first until all units are allocated.

In case of a tie, sale goes to earliest bid posted.

[Badger]

Eeek

I just got quoted $160 Aus for one xs diaphram..........

needle and seat $53, main jet $27

Ok brothers in XS, time for .........sooouper help........
What is the latest on procuring diaphrams?
The UK mob at 35 pounds is better but not much.
I tried to follow the ebay site mentioned above but found no mention of yammy diaphrams there.

So guys, what are the options?

Just an update on my saga.
The local 'mechanic' after cleaning carbs adjusting shims new plugs, new caps, and lots of revving the crap out of it gave up, and charged handsomely for the damage to his pride. He did however give the name of a guy who is set up to bench test the TCI, and coils [at the other end of the earth].
Said bloke, at his liesure, tests said items, and declares them fit and serviceable.

Fortified by stories of success on this site, I go through the carbies [third and most thorough time], and reinstall.
This time I used the balancing guage I made for $35 after reading how to make one [somewhere] on this site, and the thing now idles better than it ever has, [I just about gassed myself yesterday 'cause I just love the sound of this bike at idle], but......on loading the engine it still feels like one pot is not helping until half throttle and about 5 grand.
Once up around 120 km/h [on feathering the throttle] it seems to settle down, until one tries to accelerate again.
With no load it revs fine, and it feels like there is a heap of power trying to get out....once it comes on it feels good......until higher revs, and wider throttle settings [up with the fairies, or should I say close to the angels], it starts to miss again.

This one I think is about the main jets........125's [it had a 4 into 1, but I refitted the 4-2], I've always suspected that the air box was restrictive at higher revs.
I know it's naughty, [to introduce more variables mid crisis] but I couldn't help myself, so while I had the air box out [again], I drilled the bottom filter/centre and put some fly wire across to keep larger crap out.
I think this is allowing more air in, and exacerbating the high end mixture probs. [I know this is counter intuitive]

A friend told me of positive experiences with a local garage that specialises in tuning with a dynometer [??], so my next step is to find out under test what is going on with the poor old thing...of course he cant look at it until late next week, something about having to fit a super charger first........now there's a thought......

I'll not do anything more until I know exactly where the trouble is, but I didn't like the look of the diaphrams anyway.....wrinkly, abraided in patches, I'm very suspicous of them......although, I ran the motor without the air box just to see what was going on and [without load] the slides seemed to be synchronous.

Oh, for those with the non nipple float chambers wanting to check float levels in situ, I found a brass fitting that was roughly the size of the solid brass plugs, and brazed a bit of copper tube onto it. The copper tube was of a size [about 4 or 5 mm I guess sorry to you imperials] that I could fit a piece of plastic tubing onto it.
I ran a die over the fitting so the thread matched the float bowl [8mm / 1mm pitch], and you know the rest.....if you keep it short it is possible to check the level on the bike!

Those of you who have spare carbies could sacrifice a spare drain plug, drill it, braze it etc.

Any one know of four new diaphrams for sale to suit a 1980 XS 1.1 [G or standard I believe], I'd love to hear from you.
Ditto the float valve needle and seats and jets [2 115's & 2 120's]

Cheers B