I have leaky carbs - float bowls leaking like sieves - where is ithe best place to get the seals and does anyone know what the reference number is.


Thanks in advance.

The genuine yamaha part number for the float bowl gasket is 3GM-14997-00. Might be just called "O ring" on yamahas system.

Chris

Nitrile o-rings have a shelf life of 15 years. see SAE ARP5316
That is not service life.
Considering the age of the motorcycle it would be prudent to replace all carburettor seals and gaskets.

Thanks for your help Chris and Maelstrom

@ Mang,

take a look at litetek below

home page
http://litetek.co/

and yam carbie page
http://litetek.co/Carb_Kit_Yamaha_3TJ1.html

or find him in the "approved traders section" under maelstrom

HD you are too quick
Thanks for the plug, but I do not have the complete kit ready yet. That link to one of my my carb pages is not actually accessible unless you happen to know the URL.

I almost have the 'A' kit ready for the Yamahas. The float bowls seals arrived yesterday and they are excellent but the Jet Housing seal is a little off, and I am going to have a new mould done. As soon as I have the new Jet Housing Seals then I will begin to sell the 'A' kits.

My supplier hates me because my tolerance is so small but there is a reason for that. The slide housing and the jet housing are squeezed together by the fastening of the needle jet fixing screw. On both sides there are seals, on the top is the o-ring that resides under the slide housing, and on the bottom is the jet housing seal. The thickness of these seals is quite critical. Although you may find posts (I have seen many) that say something like "just buy this (wrong size) o-ring at your local store" it is not a good idea. A carburettor is not a lawn sprinkler. I have also seen posts that suggest that Mikuni use the wrong size o-rings and that 'this one is better'. Unless such statements are supported by facts, I would take them with a grain of salt and consider that the engineers at Mikuni may know more than the anonymous poster. It is not my intention to offend anyone by making these observations. In the case of o-rings there may be many cases where a close substitute may work. However, as someone who is trying to establish a business by supplying quality parts I cannot afford the luxury of 'maybe'.

Also I am not sure whether the poster has the BDST vacuum carbs or the flat slides. I didn't know there was a 3TJ2 SP.
cheers
Blair

|Maelstrom

Shame the kits are not ready but let me know when they are.

FZR400RRSP EXUP 3TJ2 (1990) 1TJ-141101 - 1TJ-152000
Adjustable preload on front forks, fully adjustable rear
shock, oil cooler is fitted as standard, close ratio gearbox,
larger capacity radiator, 1 extra fibre and 1 metal clutch
plates, spacers fixed to front and rear wheels, single seat
unit, lighter cam buckets, different rear calliper bracket.

Cant get the image to attach sorry
Can anyone explain how I upload images?? thanks

image uploads, and how to below

viewtopic.php?f=6&t=7902

model identifier below

http://www.mediafire.com/view/?r0u0vw38127uobm

the 3tj1 rr and 3tj2 sp have vacuum carbs the 3tj6 sp and 3tj7 sp have flat slides although they only made 500 of each of the latter 2

@maelstrom your far to modest yeah i picked the url up from a different thread, when you were discussing the options for a seal kit, just thought i'd pass it along, hadn't realised you weren't quite ready yet let us all know when your up and running, there's plenty who would be interested in proper Os and seals as there rare as rocking horse doos

I now have all the bits to rebuild my carbs - all standard bits I hasten to add. Could anyone tell me the needle height setting its a 3tj2 SP.

Look in the manuals part of the forum .... go from the front page and find the 3TJ setup manual, it's for a 3TJ2