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**trbig** · 08-03-2013, 09:11 AM

What jets you use in your carbs depends greatly on what exhaust you'll be using. I like to use Mikuni parts for Mikuni carbs, but the main problem is using other-than-Mikuni jets/parts in one carb while having stock stuff in another. Or mixing/matching in the same carb.

I'd be interested to hear how this goes. I put the Dynojet kit (Stage 2.. pod filters) in mine and it only went up a mile or two per gallon, but I love the adjustability of the slide needles, where the stock XJ needles have no adjustment.

**KA1J** · 08-03-2013, 10:43 AM

TR,

Yeah, the idea is to have the perfect carb/exhaust match.

I have both a set of Jardine Spaghetti and stock exhaust and the stock exhaust is on it now. I found no difference between the Jardine & stock XJ11 exhaust except the Jardine were throatier and hung lower at the rear. I found the bell of the Jardine exhaust would touch in steep cornering & the stock does not. The only non stock engine related things on my XJ11 are:

1. YICS eliminator.
2. Dynojet stage 1
3. Home built K&N air filter built from an old paper filter frame.
4. Dynacoils, 8mm plug wire, resistor free plug caps, Iridium plugs and 12V relay to bring max volts directly from the battery to the coils.

The idea of assuring the carb jets are non-buggered is important to me because this bike had been terribly molested in the past and so much on it had to be replaced because of PO laziness & stupidity. I know the carbs were messed with before I got it because #3 main jet was loose on the floor of the bowl and the washer was missing... I have no idea what that genius did to clean out the jets but I can only see him enlarging small openings and bending anything bendable. I'm pretty obsessive about doing things right so I want to undo the PO's voodoo.

I just need to know which jets I should use to make this right as I don't want the YICS system and I have the passageway plugged with the eliminator. - Which XS11 was it that was mechanically/electrically interchangeable with the XJ, the 81 Special? Maybe I should use those jet values? And... I need to know where to get good quality & affordable replacement jets, emulsion tubes and throttle shaft seals.

**trbig** · 08-03-2013, 10:58 AM

As far as the mechanicals, all of them will operate with the throttle cable, but the XJ is exclusive with its choke(Enrichener) The 81 bikes had smaller 110 mains, but the same pilot jets. Having or not having the YICS system operable would change nothing on the jetting, but I would suggest maybe one size up on the main jet from a 112.5 to a 115 because of the K&N mod. Besides that and the Dynojet kit, (I'd probably consider doing the stage 2 as well because of the K&R filter having more air flow than stock.. I had to put the clip at the top slot to get my throttle response right) I'd just go back with stock Mikuni parts if it was me. I've never heard of the neoprene floats ever going bad, so don't know why you'd change those, and would never change the air jets in the bell if they were clean and unmolested, but to each his own. From what I've heard, Mikes is going to be one of the best places for all the parts.

Now.. just remember that all of this is just my OPINION and may vary with what others think/suggest.

**KA1J** · 08-03-2013, 11:21 AM

What I'm hoping to accomplish is making the 2nd set of carbs essentially stock, essentially in that I am happy to use less expensive aftermarket jets & the like if they are identical clones of the originals.

I tend to keep the K&N well oiled with the sticky foam filter spray and it's probably flow-wise much like paper, I don't let it get low on oil.

I wasn't thinking of replacing the floats but I will be putting them on glass and see if they're twisted & will bend them back to true if they're bent. I wouldn't have considered replacing the emulsion tubes except the one on the Maxim-X #4 carb was indeed ovaled out, perhaps from needle wear and I sure didn't see it. What... a difference after a good one replaced it. I've come to realize just how critical carb parts have to be to be right.

**natemoen** · 08-03-2013, 11:42 AM

http://www.jetsrus.com/

Pilot jets
http://www.jetsrus.com/a_jets_by_car...0-96_pilot.htm

Main Jets
http://www.jetsrus.com/a_jets_by_car...arge_round.htm

Air Jets
http://www.jetsrus.com/a_jets_by_car...mall_round.htm

You can find cheaper prices, I seem s jets r us has went up in price lately. I got genuine mikuni pilots from a local parts place for about 2.50 each. Good luck with the needles and emulsion tubes.....NLA

WMarshy was working on having replicas made.

**KA1J** · 08-03-2013, 11:52 AM

Thanks for the links.

I used to make jewelry for a hobby and got pretty adept at casting silver. It wouldn't be that much of stretch to replicate emulsion tubes or needles. The machining on a jeweler's lathe would maybe be somewhat time consuming but once the molds were made making further clones are very straightforward. Sadly all that equipment belonged to my friend/instructor who is in Indiana.

I suspect if there was an available source for repro emulsion tubes & needles that there would be quite a few people wanting to go "as new" in their carbs.

**motoman** · 08-03-2013, 03:43 PM

Originally posted by KA1J View Post

TR,

Yeah, the idea is to have the perfect carb/exhaust match.

I have both a set of Jardine Spaghetti and stock exhaust and the stock exhaust is on it now. I found no difference between the Jardine & stock XJ11 exhaust except the Jardine were throatier and hung lower at the rear. I found the bell of the Jardine exhaust would touch in steep cornering & the stock does not. The only non stock engine related things on my XJ11 are:

1. YICS eliminator.
2. Dynojet stage 1
3. Home built K&N air filter built from an old paper filter frame.
4. Dynacoils, 8mm plug wire, resistor free plug caps, Iridium plugs and 12V relay to bring max volts directly from the battery to the coils.

The idea of assuring the carb jets are non-buggered is important to me because this bike had been terribly molested in the past and so much on it had to be replaced because of PO laziness & stupidity. I know the carbs were messed with before I got it because #3 main jet was loose on the floor of the bowl and the washer was missing... I have no idea what that genius did to clean out the jets but I can only see him enlarging small openings and bending anything bendable. I'm pretty obsessive about doing things right so I want to undo the PO's voodoo.

I just need to know which jets I should use to make this right as I don't want the YICS system and I have the passageway plugged with the eliminator. - Which XS11 was it that was mechanically/electrically interchangeable with the XJ, the 81 Special? Maybe I should use those jet values? And... I need to know where to get good quality & affordable replacement jets, emulsion tubes and throttle shaft seals.

Metering rods determined the stock main jetting between the 80-81 carbs and the 82(XJ) carbs. You have to remove the metering rods to read the numbering/lettering on the side at top of metering rod. 5GL16 are the stock metering rods for the 80-81Specials. The 80-81Standards had a different taper/configuration of the metering rods, so had the staggered jetting(richer inner two cyl.) and two step richer main jetting. The XJ carbs had 112.5mains stock, but again, had an even different numbering/lettering metering rods.

**3Phase** · 08-03-2013, 04:23 PM

Originally posted by KA1J View Post

... I am happy to use less expensive aftermarket jets & the like if they are identical clones of the originals.

That's the problem, KA1J -- they're not identical clones of the OEM jets. For whatever reason, way too many people have had nightmares caused by aftermarket jets and couldn't get any sleep until they used genuine Mikuni jets.

There's nothing wrong with aftermarket jets, they're just bits of metal with holes drilled in them, but you have to futz around pulling the carbs and putting them back on again while you try to find the correct jet sizes and tune the engine. Once you get it all dialed in then you should stick with that brand unless you just, like, totally enjoy re-jetting and re-tuning.

For new Mikuni jet needles read:-

Jet Needles

.

**oldnortonrider** · 08-03-2013, 05:58 PM

Keyster carb kits for early BS34s on XS11s have the emulsion tubes as part of the kit. http://www.siriusconinc.com/pro-deta...product_id=679

**Rasputin** · 08-03-2013, 09:37 PM

Originally posted by KA1J View Post

I tend to keep the K&N well oiled with the sticky foam filter spray and it's probably flow-wise much like paper, I don't let it get low on oil.

If you are cleaning that K+N material at every oiling you are over doing it a bit. I contacted K+N on a warranty issue and they said that too frequent cleaning or over oiling were the biggest issues they had to deal with. Check out their site FAQ's and even message them. I was impressed with the knowledge of the guy I spoke to on the phone as well as their warranty. Just figured I would throw that into the mix as it may also affect tuning issues.

**natemoen** · 08-04-2013, 07:06 AM

Originally posted by oldnortonrider View Post

Keyster carb kits for early BS34s on XS11s have the emulsion tubes as part of the kit. http://www.siriusconinc.com/pro-deta...product_id=679

Just cause they give you an emulsion tube doesn't mean it is the correct one.

**3Phase** · 08-04-2013, 09:43 AM

Bingo, Nate!

There are no part numbers for the parts in the Keyester carb kits and I suddenly got a strong feeling of 'vuja de' just looking at it so I went parts surfing last night. I rediscovered a few links that I'd read while working on the Mikunis on my '80G and the Keihins on my friend's 1980 Honda CB900 Custom. It looked pretty grim for the aftermarket kits for Keihin carbs.

Mike Nixon's "Motorcycle Project" site:-

Mikuni vs. Keihin

Carb Kits

Carburetor Rebuild FAQs

Naked Goldwing Club Technical Forum:-

This is a 19 post, image-heavy thread that I've linked to Post #10
Carb Kits - Float Valves

Post #11 shows the Keihin slide needles.
Post #12 shows the parts for the Keihin emulsion tubes.

Would you like to try to use and tune four Mikuni pattern carburetor repair kits that were made with the same exacting standards and attention to detail as the Motion Pro pattern valve shim tool?

Be careful.

.

**KA1J** · 08-04-2013, 10:57 PM

Thanks for all the thoughtful replies.

There's a lot of food for thought in this thread. I was hoping for a straightforward answer when I asked, like use these jets and buy them from here...

Seems there are possible differences between the OEM parts and the aftermarket parts and those differences may be an issue. Sounds like the best idea is to use OEM replacement parts but unobtanium after 30 years is an issue.

As mentioned in the initial post for the XJ11, the stock XJ11 jets are:

Main Air - 170
Pilot - 47.5
Main - 112.5
Unsaid was the specific emulsion tube but the Yama part # for the XJ11 is 3H5-14941-02-00 and cross referencing that the emulsion tube is the same for:

XJ1100J 1982 1100 XJ1100 Street
XS1100G 1980 1100 XS1100 Street
XS1100H 1981 1100 XS1100 Street
XS1100LG 1980 1100 XS1100L Midnight Special Street
XS1100LH 1981 1100 XS1100L Midnight Special Street
XS1100SG 1980 1100 XS1100S Street
XS1100SH 1981 1100 XS1100S Street

So apparently all the XS1100's and the XJ11 use the same emulsion tube.

I looked on the emulsion tube and found the number 300FJX-7 and the 7 is quite distinct and definitely not a 2 but doing a google for 300FJX-7 only shows a couple of posts here for emulsion tube 300FJX-2 Go figure...

But back to the XJ11 jetting values
Main Air - 170
Pilot - 47.5
Main - 112.5

This spare XJ11 set I have has the following values in all four carbs:

Main Air - 170
Pilot - 47.5
Main - 115 - so the mains have been changed or this is not a carb set for the XJ11 - does have the enrichment circuit so I suspect it is an XJ carb set. I'll look for Mikuni 112.5 jets for it.

While I have these carbs apart I want to replace the throttle shaft seals. I mentioned this link earlier but I don't recall any comments as to whether these are the appropriate shaft seals. http://www.mikesxs.net/product/48-5021.html

Idears?

**Rasputin** · 08-04-2013, 11:07 PM

Check out www.XJ4ever.com They have quite a comprehensive list of things that can be bought through them that are for the XJ's. I am not certain they have these parts but it may well be worth checking.

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