Identify a Mikuni carb. from a 20+ year old generator

[trooper1954]

Hi all,
Can anyone help in identifying this 20-25 year old Mikuni carb from a Mitsubishi MEG 5800 generator?
Also, trying to remove the main jet, I damaged the screwdriver slot badly...the needle is seized I think...should I leave well alone or try using a lefyt hand extractor to get it out? My concern is maybe I wont find a replacement jet?

I think I see the following numbers in one of the photos....
3orB4021?3orB
U851
Also numbers on the butterflys.... some sort of mark with 190 on one
and 6 on the other.

Any help appreciated.

Attached Thumbnails

 

[andyvh1959]

Did it say Mikuni on the float bowl? I don't see where it says Mikuni on it anywhere. Could be a Keihin carb. Doesn't really matter though as jets and misc carb parts are very similar to each, especially for a basic carb like that one. I hate to say it, but cheap knock off Chinese carbs are easy to find on Ebay, might be an option.

For that age carb you do have more adjustability than modern carbs. So there is some logic to use a screw extractor and salvage that carb. Also, those screws on a Japanese carb that look like common philips heads are not. They are JIS-philips which has a diferent tip and notch profile such that standard US-philips screwdrivers will quickly ruin the screw and may keep you from getting them loosened or tightened. If you plan to work on Japanese carbs, buy a set of JIS spec philips screwdrivers.

https://www.amazon.com/B4633-Screw-Driver-Bits-Japan/dp/B085TDRBPM/?tag=atomicindus08-20

 

[PoorUB]

Maybe?
https://www.amazon.com/dp/B0DGFCSGGQ/?tag=atomicindus08-20

 

[theoldwizard1]

Chinese/aftermarket carbs are, at best, 50/50.

If you have damaged the main jet, try to get an exact replacement.

 

[theoldwizard1]

Also, those screws on a Japanese carb that look like common philips heads are not. They are JIS-philips ...

Small engine carb main jets are slotted. The do require a "special", hollow ground screw driver.

 

[trooper1954]

Thanks folks,
I will order the chinese carb, it is for the model of generator I have.
Not sure where I would find carb jets.....I'm in Canada so may be difficult.
Do the fuel spigots that fit the fuel lines screw out....one of mine is broken?

 

[nadogail]

As long as the replacement bolts on and is sized for the approximate displacement of the engine, almost any carb can work.

 

[andyvh1959]

SUDCO was always my source for any motorcycle carb parts:

Sudco Intl. Corp. - Carburetors

May be a source or guide to a source for other carb parts.

 

[trooper1954]

The only identification on the jet is A27....cannot find that anywhere on the net.

 

[The Cobbler]

A27 must just be part number. It would be far to large for a drill size .
what kind of motor is it from? it seems to resemble a Wisconsin Robin engine carb going by memory.

 

[The Cobbler]

Do the fuel spigots that fit the fuel lines screw out....one of mine is broken?

pressed in , maybe some epoxy or loctite would help .
I'm ion the replace with a chinese carb camp. I've had good luck with them.

 

[Smilodon]

SUDCO was always my source for any motorcycle carb parts:

Sudco Intl. Corp. - Carburetors

May be a source or guide to a source for other carb parts.

As far as I know Sudco is closed/closing...

 

[trooper1954]

The Cobbler.....I take it then if pressed in there's little chance of removing what's left and replacing it unless I drill it out??
Thanks.

 

[BillK]

The Cobbler.....I take it then if pressed in there's little chance of removing what's left and replacing it unless I drill it out??
Thanks.

The new carb should come with the fuel fitting. What brand and model number is the generator ? Check with Jacks Small Engines and see if they show a replacement. Everything I have bought from them has worked perfectly.

https://www.jackssmallengines.com/

 

[theoldwizard1]

As long as the replacement bolts on and is sized for the approximate displacement of the engine, almost any carb can work.

There is a difference between "work" and and work well.

On a generator, if the engine can not maintain a smooth, constant 3600 RPM, the voltage will drop as well as the frequency (Hz). Not good !

 

[The Cobbler]

pressed in there's little chance of removing what's left

I think it's time to think about a new carb. I would chance a Chinese one . I've had good luck with them

 

[andyvh1959]

I agree on the carb update. For a device meant to run at a constant rpm the carb selections become much easier. Not like trying to select a carb for a motorcycle where performance and feel/response are both critical to the carb selection and jetting setup.

 

[trooper1954]

Thanks guys.....I'm disappointed that I cannot salvage the original carb, but have ordered a Chinese replacement. seems strange to me that the fuel connections are not threaded in...a simple crack or break as in this case renders the carb irreparable.

 

[Leon bee]

Well, don't throw it away.......fix it later.

 

[trooper1954]

yes, thanks Leon bee....i will save it, but do you think its advisable to drill out that fuel connector or there some other method?

 

[The Cobbler]

fuel connections are not threaded in...a simple crack or break as in this case renders the carb irreparable.

apparently some old Volkswagen's had an issue that the ****** was coming loose, spilling fuel and causing fires
yeah, it works 99.999% of the time

 

[Leon bee]

It's brass? Probably get it out if it's brass, wintertime project.

 

[trooper1954]

Thanks Leon bee....maybe I'll try an extractor, but then again if it's not threaded that may not work.