Author Topic: Mikuni Carb Strip  (Read 520 times)

Kev

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Re: Mikuni Carb Strip
« Reply #15 on: April 16, 2018, 05:03:12 PM »
No itís the brass tube the needle slide into, if you turn the carb upside down with the lid off, then remove the main jet and itís washer you can then tap out the tube with a suitable drift, caution watch out for the locating lug when reassembling. Alternative way of cleaning is to put a cotton bud in an electric hand drill and soak the tip in brasso or t-cut and force it in the tube then give it a good spin.

Bob the B

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Re: Mikuni Carb Strip
« Reply #16 on: April 17, 2018, 05:13:15 PM »
Where can I get o rings for the choke plunger and needle valve body? 

Kev

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Re: Mikuni Carb Strip
« Reply #17 on: April 17, 2018, 07:49:59 PM »
Legend motorcycles do a nice rebuilt kit Bob for not a lot of money, Iíve got 0 rings here if you donít want to buy the kits.

jcsnook

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Re: Mikuni Carb Strip
« Reply #18 on: April 18, 2018, 01:37:45 PM »
Where can I get o rings for the choke plunger and needle valve body?

O rings on the choke plunger?  You mean the float valve?  My choke plungers only have a rubber bottom on them, to seal against the carb body...no o ring.
If your not mixing gas, your not hauling ass!

Kev

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Re: Mikuni Carb Strip
« Reply #19 on: April 18, 2018, 04:42:49 PM »
My cold start plungers have o rings and rubber ends, maybe two different versions.

tzr-v4

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Re: Mikuni Carb Strip
« Reply #20 on: April 18, 2018, 05:10:30 PM »
From what I understand...
 - bottom rubber is for sealing the fuel
 - o'ring is for sealing the air

But I maybe wrong...

Olivier.

https://yambits.co.uk/tzr250-choke-plunger-kit-p-69075.html
Olivier.
TZR250 2MA & 2XT, RD500s et TZR-V4 building...

teezer250

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Re: Mikuni Carb Strip
« Reply #21 on: April 19, 2018, 02:00:46 PM »
Both my 1kt bikes standard carbs choke plungers have "o" rings on them.
I have bought off ebay a 5 pack of Viton "o" rings for my float valves if necessary when i strip both sets of carbs down.
These are 6.5mm I.D. X 1.5mm cross section to fit keyster float valve brass body,the groove is 1.9mm wide.Not tried them yet.
The genuine yamaha float valve brass bodies "o" ring groove is narrower at 1.5mm

jcsnook

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Re: Mikuni Carb Strip
« Reply #22 on: April 19, 2018, 03:33:44 PM »
Intersting!  Maybe mine are missing?  Seems to run/work just fine without them tho...

They can't fit very tight in there, or they would prevent the plungers from moving freely and sealing tight against the carb body.

If you find a source for them, please post.  I've got to order some float valves and gaskets for my carbs, so maybe I'll order some new plungers and see if they come with 0 rings on them.
If your not mixing gas, your not hauling ass!

James P

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Re: Mikuni Carb Strip
« Reply #23 on: April 22, 2018, 02:35:43 PM »
You are correct that the gasket is not an available part.

Well, partly correct - the gasket isn't available from Yamaha as far as I know. However, Gasket Guru Dan can supply them. They are also available from Japan either separately or as part of a "rebuild" kit.

Regards,
James

Edit: Oops - have just seen that Olivier beat me to it :-[ !
Reproduction TM28ss gasket is available...
MACCAS https://www.gasketguru.co.uk/product/yamaha-tzr-250-2ma-1kt-carb-body-gasket-premium-quality-pair/
« Last Edit: April 22, 2018, 02:38:34 PM by James P »

teezer250

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Re: Mikuni Carb Strip
« Reply #24 on: April 22, 2018, 03:51:50 PM »
I have just stripped my 1kt carbs down and found small rust particles in the float bowls causing them to leak when the engine was running.I ultrasonically cleaned them and bought and tried to fit the genuine yamaha net filters on the carb fuel intake spigots but the inside diameter of the spigots are too small for the net filters to go inside.

Has anybody else had this problem fitting net filters to 1kt or 2ma carbs?
As far as i know they are fitted to the 3ma and 3xv models.

Kev

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Re: Mikuni Carb Strip
« Reply #25 on: April 22, 2018, 04:24:24 PM »
I wonder if you have been given filters for a Dt125r instead as it has a larger brass fuel inlet spigot than the TZR250. Iím fitting extra in-line filters at the moment, as I cannot trust the filter in the fuel tank as the tank is starting to degrade internally.

teezer250

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Re: Mikuni Carb Strip
« Reply #26 on: April 22, 2018, 04:48:49 PM »
I wonder if you have been given filters for a Dt125r instead as it has a larger brass fuel inlet spigot than the TZR250. Iím fitting extra in-line filters at the moment, as I cannot trust the filter in the fuel tank as the tank is starting to degrade internally.

What bike and what type of in-line filters are you fitting them to?
I bought the net filters from Webbs and the part number is: 1KT-14994-00.

The workshop manual does not show or list them in the exploded diagram of the carbs assembly.
« Last Edit: April 22, 2018, 04:52:15 PM by teezer250 »

Kev

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Re: Mikuni Carb Strip
« Reply #27 on: April 22, 2018, 05:49:26 PM »
Same number on Fowlerís website. Iím just fitting some clear in-line cheapies from eBay as extra insurance. Donít understand why yours donít fit.

Kev

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Re: Mikuni Carb Strip
« Reply #28 on: April 22, 2018, 05:51:28 PM »
Picture shows size of one fitted to Dt125r which also uses TM28ss

Kev

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Re: Mikuni Carb Strip
« Reply #29 on: April 22, 2018, 05:56:31 PM »
In-line filters on my 89 Tzr.