Pinned Needles and needle jets/emulsion tubes - FZR250 Mikuni BDST28 Carurettors

The top of the needle is machined into the profile of it, as a result there is no slop from a C clip, but you have to use a spacer shim under them to adjust the height, RC car 3mm ID ball joint spacers are perfect for this, come in packs with 0.5mm increments from 1mm to 5mm, and are precision machined. Stock shims are 0.5 so you have from 0-5mm in 0.5mm available if you do this.

In regards to how the needle is held, the spring forces the needle flat onto the slide. With more of a shim under the needle the spring holds it into place more firmly.

 

think i just found the solution to all our carburetor problems

http://www.ebay.co.uk/itm/262668405642?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT

 

@maelstrom that wins the Understatement of the Millennium award

 

bump, any progress with the fixes??

i finally received my litetek seal kit in the post today, but my needles and tubes are pretty badly worn. I managed to find a set of tubes on yahoo japan:

http://www.jauce.com/auction/c573686790#international_delivery

and was thinking of getting the chinese needles to use with them.

http://www.yoycart.com/Product/15216980726/

because there's no point in buying the full keyster kits if im gonna be using the litetek seals right??

hopefully it will only be a stopgap till ye bunch of geniuses work out a permament fix

 

Temperature is getting lower over here in The Netherlands (around 5°Celcius), and cold start is an PITA.
With normal outside temps, cold start could be done with no choke, but now, with these lower temps I have to tweak the choke somewhere in the middle to get her to talk. No easy job. As soon as she runs, she keeps talking, no problem.

I don't know if this is due to the Keyster kit, but before the problems I never had any isues with starting.
So, if I was in the market for needles and tubes, I would skip the Keyster and go for the originals. Since those parts are also in outboard engines, Yamaha does still carry them and the parts are available via every Yamaha dealer. Not cheap but available.

Just my humble opnion.

 

@maelstrom can perhaps update you on the emulsion tube fix he's working on

 

that looked like a keyster one, I couldn't see any stamping of the specs on it as you would have on a mikuni

 

yeah they are made by kiwami whose kits i see a lot of on japanese auction sites, heres a link to one, though the kit seems to be minus the tubes for some reason.

http://www.jauce.com/auction/k230979371

also in the auction for the emulsion tubes it says "quantity four" but when you scroll down it says you are bidding on one, maybe its just a problem with translation but if it was for the four then it would be a bargain alright.

@GreyImport by the looks of that drawing am i right in thinking you are looking at getting some manufactured??

 

that's the damnedest thing, that kit lacks the one f&*^%ing part which wears and make them run sh%$

 

at this stage i think the entire world is out to lead us around the nose and empty everything from our wallets with these damned carburetors!! Thats why owners sites rock so much, at least the interest and talent can be concentrated and hopefully a permament fix isnt too far on the horizon.

 

less intimidating price than I've seen elsewhere for the emulsion tubes

http://www.parts-sale.jp/YAMAHA 3LN-14141-28?search=3ln-14141-28