Mikuni Hs-40 Carb Swap Information

[drzoo2]

QUOTE (hanson0429 @ Mar 13 2007, 03:31 AM)

I will take one if there are any left.
Danny[/b]

I only have some parts carbs right now but I have a chance to find some more Sunday. I'll look for you and let you know if I get my hands on some more. PM me because I can get some A+ carbs but they will cost me better than $30. Basically sometimes I can get them for $10 and sometimes a dealer wants more depending on known condition.

z

[MRPoopie]

does any one know what thread the carb bowl screws are? the people at my dealer are a bunch of jerks and dont know anything and when they figure out what part you want they are out of stock on it.

thannks,
clayton

[drzoo2]

QUOTE (MR.Poopie @ Mar 13 2007, 03:11 PM)

does any one know what thread the carb bowl screws are? the people at my dealer are a bunch of jerks and dont know anything and when they figure out what part you want they are out of stock on it.

thannks,
clayton[/b]

I'll get you some tomorrow. I have access to an assortment. I should have before I sent you the carb. My apologies. I can tell you the pitch also when I figure it out in the morning.

z

[MRPoopie]

dont worry about it man . you have already done enough for me ill just look around and see what i have . i just wanted to know what thread it was . i have the little gauge that tells me but i couldnt find it

[MRPoopie]

QUOTE (NormalZ @ Jan 13 2007, 02:33 PM)

Hey brother, I don't know what's going on with my computer right now, but I can't find this original post in the Performance Section now... It was good info for you (if you don't already have it), so I somehow found the missing post and swiped the info back. Here it is:
Here's the HS40 Tuning Manual, brother:

http://www.mikuni.com/pdf/hs40_manual.pdf

Don't know if you have it yet or not. You'll have to call Sudco about the needle - I can't get their catalog to come up on the computer, but I know they carry parts for the HS40. Here's Sudco's homepage:

http://www.sudco.com/

Then their Mikuni page - hit up the TM-40 information there:

http://www.sudco.com/mikuni.html

Here's a soft-parts rebuild kit for it (1/3 of the way down the page) - for when you need the info:

http://www.steelthundercc.com/carburetors.html

Here's some info from one of the XR650 guys on ThumperTalk; it may help out:

BWB6304-30-2005, 06:59 PM
The HS40 is the mikuni pumper carburetor for Harley's before the Mikuni HSR 42. It is a lot like the TM40. They use the same jets and are all but, the same. I have ran both the Mikuni TM40 and the Mikuni HSR 42 on the XR650R stock and bored to 680cc. The Mikuni HSR 42 seemed to give more power everywhere but, real noticable down low. I thought it ran wet (Not all the fuel burned, that's not the same as ritch) But, I switched to a TM40 and haven't put the Mikuni HSR 42 back on to see what was up. I used pvc for the adapters (worked real good) for both the TM40 and HSR42. The TMR40 Mikuni is the way to go for a stock XR650R out of the Mikuni line up. If the HS40 was off a Harley you will have about a 160~165 main jet and a Y-6 needle jet, a 22.5~30 pilot and a 0.9 air jet. For a stock XR650R (uncorked with a free flowing exhuast) You will need something close to this: 1.2 air jet, 22.5 pilot, Y-4 needle jet, 9Doj-1 needle, and a 135~137.5 main jet.

BWB6305-01-2005, 07:50 PM
You will have to make adapters for the front and back of the carburetor. I used pcv turned down on a lathe to fit. I have seen some real cool aluminum ones made. Sudco and XR's only has them but, I do not know if they sell them apart form the kit. The Mikuni TM40 is the smoothest carburetor I have used on the XR650R (once tuned). I hope your HS40 works out as well. The air jet was a big deal, the TM40 and HSR42 ran real bad at the bottom intill I changed the air jet to a 1.2. Didn't matter what pilot I used there just wasn't enough air to atomize the fuel. I ran a little fat on mine 25 and 27.5 pilot and ran the pump a little late. The needle jet and the needle you run will make a huge difference. The TM40 kits they sell for the XR650R have a 8djh-4 and Y-8 needle jet, some have had lots of trouble with that setup. You might have the Y-6 I found the Y-4 the best. The squirt from the pump nozzle must hit the needle. The pump nozzle moves with needle nose plires on the TM40. It can be a fight to tune a unknow carburetor but, it will be worth it. Pumpers :thumbsup: rock compared to the stock Vacuum flow carpuetor. Please let me know the out come. I can put the info on my carburetor page.
borynack@hotmail.com
http://xr650r.borynack.com/

Looks like there's only one needle available on this page from Carb Parts Warehouse, but calling them might turn up something else:

http://www.carbparts.com/mikuni/mikuni_tuning.htm

Motorcyclecarbs.com is calling the TM-40 the HS-40 right here, so that may turn up some more options for ya:

http://www.motorcyclecarbs.com/Mikuni_TM40...771168714488122
Hope that helps, somehow... Start digging! HA! [/b]

i posted this here cause this is the thread i continue to look at for info

[MRPoopie]

scott where was it that you got your carb bowl gasket ? sudco is out of stock till the end of the month and i dont want to spend 50 or so bucks on it from the other place.
the harley shop down the street sell jets, so that an easy way to get my hand on some jets.
but when i brought my carb in they looked at it like it was a piece of ancient technology and showed me some of the newer models .

thanks
clayton

[drzoo2]

QUOTE (MR.Poopie @ Mar 15 2007, 01:10 PM)

scott where was it that you got your carb bowl gasket ? sudco is out of stock till the end of the month and i dont want to spend 50 or so bucks on it from the other place.
the harley shop down the street sell jets, so that an easy way to get my hand on some jets.
but when i brought my carb in the looked at it like it was a piece of ancient technology and showed me some of the newer models .

thanks
clayton[/b]

Let me see what I can find you Sunday. I'm going to look for some more of these carbs. I am going to need one myself in the near future. How much did sudco want for the gasket?

Scott

[CFM-Z440]

QUOTE (MR.Poopie @ Mar 15 2007, 12:10 PM)

the harley shop down the street sell jets, so that an easy way to get my hand on some jets.
but when i brought my carb in the looked at it like it was a piece of ancient technology and showed me some of the newer models .

thanks
clayton[/b]

Ya, the HS is the old version of the HSR... The jets are the same ones that fit in the Z's stock carb so you can get them anywhere.

Have you ever heard of anarobic sealer? You can use that with or withoug your old o-ring untill you can get your hands on a new one.

[MRPoopie]

well Scott they told me 31.something for the rebuild kit but i have to wait till the end of the month before they get them in stock

CFM 'Chuck' where can i get some of that sealer? and will it melt with it being exposed to gas?

clayton

[MRPoopie]

my email to Sudco
__________________________________________________ _______
I'm interested in purchasing carburettor rebuild kit for the Mikuni
HS40.
The part number is 002-985 can you give me a price and some
information with what included in that rebuild kit.

Thanks,
Clayton

--------------------------------
Cris at Sudco

It is $31.16 and we are out of stock until the end of the month.

---------------------------------
can i purchase it now and have it shipped to me when you get them in stock?


Clayton
----------------------------------
Sorry Clayton you would have to wait until we have it in stock....

[CFM-Z440]

QUOTE (MR.Poopie @ Mar 15 2007, 07:44 PM)

well Scott they told me 31.something for the rebuild kit but i have to wait till the end of the month before they get them in stock

CFM 'Chuck' where can i get some of that sealer? and will it melt with it being exposed to gas?

clayton[/b]

They should have it at most auto parts stores. At the shop, we get all of our deliverys from Arnold Motor Supply. It is red in color, and looks like rasberry jelly. It truely is great stuff. I use it for all sorts of things including sealing crank case halves.

It will be fine with the gas, but try to get the surfaces clean and dry before hand, and dont use too much so that it doesnt get all over in the bowl.

[MRPoopie]

is the hs40 similar to the tm40? to me the tm40 looks like a 2 stroke carb

clayton

[MRPoopie]

How long does it take the sealer to dry?

[CFM-Z440]

QUOTE (MR.Poopie @ Mar 16 2007, 05:22 PM)

How long does it take the sealer to dry?[/b]

It is ready to use as soon as you tighten it! Thats the great thing about that stuff. No waiting.

The TM40 and HS 40 are the same size. I think the TM is a 2-stroke carb, but it must be able to add an accelerator pump or something. Im not sure on that one.

[MRPoopie]

I hear the slide rattle but it also wines is that normal ? Some what like a Super Charger ...this thing rips