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**81xsproject** · 10-25-2007, 03:05 PM

It looks like the PO went up un pilots but not mains (weird). I have an 81 with pods and 4-1 and am pretty happy with 45 pilots and 117.5 mains. I might try out the 120's though.

**AlanB** · 10-25-2007, 04:12 PM

Hi Sizzsam,

General opinion on here is DON'T DIP 'EM!! The main problem is the seals on the butterfly shafts; if you leave 'em in, they will be ruined and the carbs won't ever work right.

To take 'em out, the carbs need stripped all the way down. The screws holding the butterflys to the shaft are hammered over on the ends, and real hard to get out undamaged.

The main circuit which usually needs cleaned is the pilot circuit; there is no point in even taking the carbs off the bike unless you pull the adjusters out to clean through the passages; Those caps HAVE to go!

There are a few bits on these carbs (including those pilot adjusters!) which are easy to ruin; Take your time, have a good look through the "Tech Tips" on here, and make SURE that you know what you will find BEFORE you go in.

Enjoy!

AlanB

**fredintoon** · 10-25-2007, 04:13 PM

Hi Sam,
ya gotta take those idle screws out of there before you dip along with everything else that can be unscrewed just so the cleaning solution can get down those tiny passages. If the factory blanking plugs are still in place, it means that your carbs have never been properly cleaned from new. Note that the throttle butterfly shafts have rubber seal in them too. The butterflys are a right swine to R&R so I leave 'em in and don't dip for very long.
I have "gotten away with" doing this but will not recommend it to others. Vigorous application of spraycan carb cleaner can be sufficient.

**SIZZSAM** · 10-25-2007, 04:43 PM

Thanks fellows for the advise. I did print out all the tips on cleaning, etc. before I started but didn't run into anything about taking the caps off. I think I will take the dip bucket back. The price here was $18.00 and I thought that was a little steep. I have an air compressor and the regular cleaner so that should do. I was in Grennock Scotland in the Navy and who would have thought I would be getting good advise from there on my xs11. I love this forum. Thanks again.

**TopCatGr58** · 10-25-2007, 06:42 PM

Hey Sam,

This "may" be an example of the mixed set of carbs during the transition that Yamaha went thru from the 78-79 series to the 80-81 series carbs, where they had some carb bodies where the tunnel is still there inbetween the Main Jet tower and the Pilot Jet tower in the "float bowl" area! There were some recent threads and photos by 81XSProject/Jessie that showed how to see that tunnel!

IF yours has that sharing tunnel, then the jets you described...they are not AIR jets by the way, those ARE the FUEL jets you found on the carb body under the float!! But the sizes you quoted, 140 for the MAINS and 45 for the PILOT are probably okay for your mods, but you might find you would want ~145 mains. ALSO, the Pilot Jet TOWER will need to be capped/sealed, since it gets its fuel THRU the main jet and that tunnel, NOT from the bowl directly! The jet in the carb throat ARE the AIR jets, they don't necessarily need to be changed.

HOWEVER, IF you don't have that tunnel between the main/pilot jet towers, then the 140 mains are way too big!!! That's when you would be looking for the smaller 120 sizes. And you would NOT cap/seal the pilot jet, since it DOES get its fuel directly from the float bowl in this case!

BTW, the MAIN JET NOZZLE/emulsion tube that sits in the middle of the carb body is what the MAIN JET screws into, and once the main jet/washer are removed, along with the top cap and vacuum diaphragm slide/needle assembly, you can then push the nozzle UP thru the carb body to remove and clean....just be careful...there is a small tab in the body that it aligns with, easy to damage or break!

The PILOT JET SCREWS...which are the idle screws are on the top/front of the carb bodies, down inside a tunnel, and possibly capped with a brass cap, that is what Fred was referring to as possibly still being capped, by the factory!!
T.C.

**SIZZSAM** · 10-25-2007, 11:09 PM

Thanks TC, I've read many of your comments and respect your knowledge. I think one of my problems is getting the straight skinny on the 80 sg. The yamaha manual and Clymer differ some on the information but both just illustrate the regular standard carb and not the newer one. My model carb is BS34-111 3J6-00. Clymer states that I should use 110 jet in no.1/4 and 120 in 2/3 while the Yamaha section for the sg says 110 in 1 thru 4. If mine is 140 main than it is much too big and I'll try to get the 110's. My pilot jet didn't have a plug so I don't think it has the tunnel. I've located most of the jets except the Air jet-main that Clymer says should be a 140. Could you tell me where that would be found. I'm sorry about the late response. Anytime you can respond will be fine. Thank you and the others very much for your help.

**TopCatGr58** · 10-26-2007, 09:05 PM

Hey Sam,

If you'll look at this photo, the slotted jet in the lower left corner is the main air jet! This is the inlet bell!

The upper left is the float bowl vent. I'm not positive about the other 2 on the right side?!

Yeah, if you don't have the pilot jet to main jet tunnel, then those 140 mains are way too big!!!

The Clymer's is know to have a few mistakes, as well as Yamaha changing designs. Many folks have reported having the 110 mains all across instead of the staggered setup!
T.C.

**red bandit** · 10-27-2007, 03:00 PM

Sorry TC, (do I get points added or taken away for correcting The Ole Great One) but the lower left is air jet for the low/idle speed circuit. Top left and right are both bowl vents, bottom right is air for main/high speed circuit.

**81xsproject** · 10-27-2007, 03:45 PM

Also, the weirdo 80G carbs that I had were jetted similar to the other 80's carbs not the 70's. They were stock 115 inside and 120 outside mains with 42.5 pilots. If you do have the weirdo carbs with the rubber plugs and the passage seen below, I would go with either 120 or 122.5 mains (same for all four carbs) and 45 pilots.

**TopCatGr58** · 10-27-2007, 04:43 PM

Hey Red,

Sure you get points, brownie points!

I've said before I'm not a real tech guru like Ken Talbot, DennyZ, MRO, Prom, etc., just a shadetree survivalist and XS11 enthusiast. I don't profess to know everything by any stretch of the imagination!

I'm more of a glorified housekeeper here! Thanks for that CORRECT info. We rarely need or talk about changing the air jets, so I really haven't bothered to put their sizes or positions into my feeble limited capacity memory....that age thing you know!
See my signature!

Hey Jessie,
Just a thought! Your machine ran OKAY with the newer smaller sized jets in your tunneled carbs, and the pilot jet tower wasn't plugged!? I just now remembered another Xsive with a problem with their pilot circuit, and it was that the little hole that is in the end of the MAIN NOZZLE/emulsifier was in the wrong position and so it wasn't allowing fuel to flow thru the tunnel from the main jet to the pilot jet!

SO.....was wondering if you noticed your Main nozzle and whether it HAD the hole in the end, or if that hole was missing?? IF missing, that would explain why it would work with the smaller jets and the pilot jet tower uncapped...open to the float bowl!

And so this would also be something for Sizzsam to check out, to make sure whether he had the nozzles WITH hole or WITHOUT hole in the end near the main jet, and jet it accordingly!

Note Part D in this photo:

I don't have a photo of a later model Main Nozzle tube to show whether it has or doesn't have that hole!

**81xsproject** · 10-27-2007, 08:52 PM

I didn't check out the emulsion tubes that closely, just made sure they were perfectly clean. The set in the pic is the 80G set that I just flipped on ebay. However, for the sake of an on bike test, I did make all 4 mains 120s and they ran very nice.

**SIZZSAM** · 10-28-2007, 03:19 PM

Thanks Jessie and TC, thats why it's good to get several opinions and pick which one works. That picture shows the hole from the main to the pilot and my carb doesn't have that tunnel so it didn't have plugs for the pilots. I'm going to clean them up and see how they work with the 140 main jets and I'll change them if it doesn't behave. I bought it from a fellow in Ohio and it would crank up and run but I've never had it out for a good run because I had so many things wrong with it. I have a 78e and a 79sf that have been keeping me busy and I'm just now getting this close to running. I did the valves on all three and that made a big difference with the way the other two ran. Jesse you might have the BS34-111 3H5-00 model carb. I can barely see the numbers on the side of mine and it is the other model for the 80 sg the BS34-111 3J6-00. Mine also has the black plastic floats. Thanks for all the good information.

**SIZZSAM** · 10-28-2007, 03:29 PM

Hi TC, I checked my main nozzle and it does have the hole in the end but it doesn't do anything on mine since I don't have the tunnel. Thanks again

**81xsproject** · 10-28-2007, 04:20 PM

I am not trying to be pushy, but 140's on 80's carbs WILL be too rich. But, if you like pulling carbs, go for it.

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