The Questions begin

[mnxs11]

In my other thread I started it explains how I ended up with my new to me xs elevens.
I'm working on the red one now and as you know I can't ask the po any questions.
So the carbs were off and i am sure my cousin was having problems with them.
I am fairly sure he changed the main jets to 115s for the harley mufflers
the pilot jets are 42.5s
I have a bag of several jets he had.
There is no rubber stoppers over the pilot jet holes and I am fairly sure there should be but I am not sure.
From what I have read from searching if the little tit is in the bowels they should be there. But I also read if there is no hole in between they should not. I am not seeing a hole but I am no expert on where it would be.
Here is some pics if that helps



Any help would be appreciated.
I also have 4 brand new floats that were never put in but new need and seats were
And it looks like 4 new intake boots on the bike.
The battery cable is missing and the tci box was of for some reason.

[fredintoon]

Hi Dave,
even if you could speak to the PO, most of them are incompetent, forgetful or plain ol' liars.
OK then, if the main jets are 115s and were upgraded from 110s this implies that the carbs have separate slow running jet fuel feeds and they don't need the rubber plugs; but who knows?
The bowls (please note that a bowel is another thing entirely) having the little stops implies the plugs should be there but those bowls could be orphans.
What's important is the little slanted passage that's drilled from above the main jet to below the slow running jet.
If those slanty holes are there, the slow running jets are fed from the main jets and you need 135 main jets and rubber plugs.
If those slanty holes are not there, the slow running jets are fed from the carb bowls and you need 115 main jets and NOT the rubber plugs.

[mnxs11]

Thanks

Thanks Fred
I see no holes so I think that is good.
I had to pull the plugs off of the Idle mixture screws to get at those,so he had not taken them out. I assume but when I tried to turn those in to see where they were at they was screwed all the way in bottomed out.So I am not sure about those either.
I wish my cousin was still here with us and not killed over from a heart attack at 45 so I could at least give him a hard time.
All in fun of course.

[bikerphil]

A few tips that may be useful...

1. If there is no hole joining the main jet tower and the pilot jet tower, then don't use the rubber plugs over the pilot jet tower.

2. The 42.5 pilot jet s are the correct size, just make sure they have six air bleed holes in the sides, otherwise they are the wrong type.

3. The 115 mains should be fine for stock exhaust headers with Harley mufflers. If they are straight pipes, then 115 will probably be too small.

4. Make sure you take the idle mix screws out, all the jets and emulsion tubes and spray carb cleaner thru all passages making sure there is no blockage.

5. These carbs are designed to use plastic floats. Set them to 23MM from the gasket surface, gasket removed, carbs upside down on the bench. Check both sides of the floats making sure they are equal.

6. When reassembling carbs, set the idle mix screws 2 turns out from lightly seated and do a bench sync on the carbs before installing on the bike.

7. If you install new carb boots, clean the old gasket crud off the cyl. head and seal them with some RTV gasket maker to the head, don't forget to smooth out the excess from inside the boots so it doesn't interrupt the fuel mixture flowing into the engine.

[fredintoon]

Thanks Fred
I see no holes so I think that is good.
I had to pull the plugs off of the Idle mixture screws to get at those,so he had not taken them out. I assume but when I tried to turn those in to see where they were at they was screwed all the way in bottomed out.So I am not sure about those either.
I wish my cousin was still here with us and not killed over from a heart attack at 45 so I could at least give him a hard time.
All in fun of course.

Hi Dave,
I'm assuming you have the later model carbs with sheet steel top covers instead of cast aluminum ones and buried idle screws?
The kits for those needles include new blanking plugs that someone may have installed after reefing the new needles closed so you are still not sure.
Those needles have a plain washer and an o-ring below the spring, you can hook them out with a bent wire if they don't come out with the needle.
I did say most POs I'm sure your cousin was the exception that proves the rule.

[crazy steve]

Carb info..... http://www.xs11.com/forum/showthread.php?t=35964

[ExcessiveBiker]

Carb plugs

Hi Dave,
even if you could speak to the PO, most of them are incompetent, forgetful or plain ol' liars.
OK then, if the main jets are 115s and were upgraded from 110s this implies that the carbs have separate slow running jet fuel feeds and they don't need the rubber plugs; but who knows?
The bowls (please note that a bowel is another thing entirely) having the little stops implies the plugs should be there but those bowls could be orphans.
What's important is the little slanted passage that's drilled from above the main jet to below the slow running jet.
If those slanty holes are there, the slow running jets are fed from the main jets and you need 135 main jets and rubber plugs.
If those slanty holes are not there, the slow running jets are fed from the carb bowls and you need 115 main jets and NOT the rubber plugs.

Fred,
I have seen a lot of posts about the rubber plugs in the idle supply towers. I own several XSs, and have never had one with the plugs, now I do, and so to speak, have a dog in the hunt.
My question is, what difference does it make, when the bowl fuel level is over both of the inlets, how does it affect any of the operating modes? The only possible scenerio, would be at full throttle,where there is maximum pull on the main jet might affect the residual flow on the idle circuit. This all seems to be a non problem.
Your thoughts, boys.

ExcessiveBiker

81 Venturer (not riding yet)
81 SH (63,000 my miles)
80 Midnight
76 XS750 (33,000 my miles from new)

[fredintoon]

[QUOTE=ExcessiveBiker;394204]Fred,
I have seen a lot of posts about the rubber plugs in the idle supply towers. I own several XSs, and have never had one with the plugs, now I do, and so to speak, have a dog in the hunt.
My question is, what difference does it make, when the bowl fuel level is over both of the inlets, how does it affect any of the operating modes? The only possible scenerio, would be at full throttle,where there is maximum pull on the main jet might affect the residual flow on the idle circuit. This all seems to be a non problem.

Hi EB,
the slow running jet feeds fuel all the time so at WOT you get main + idle.
The plugged carbs feed the idle from the main so on those carbs the main is bigger.
If you leave the plug out you effectively double the slow running jet size.

[mnxs11]

It probably did not help in my confusion that I was working on the carbs in my other 80 model xs two weeks before and it had the rubber plugs.
The serial number on the silver one is in the 1900s and the red one is in the 4800s. So sometime between those builds in the same year they changed.

[mnxs11]

Tomorrow is test fire.

I have the carbs all clean and back together on the bike.
Float bowels and caps polished on the buffer.
I am waiting till morning for the new battery to charge to fire it up and see what happens.
After getting the magnifying glass out and looking futher it looks like he put 120 main jets in the center 2 and 115 in the outside 2 we'll see how that works.
There is new carb boots he already installed on the bike.
He had new floats in the carbs but in his attemp to set them they were way off and bent all to hell with one stuck closed.That carb was real nice and clean because it looked like it never had any fuel in it after he cleaned them.
I can't hardly wait to hear it run to see what else I find.

[mnxs11]

It Runs

Thanks to all who have good info.
I went out this morning and it fired right up.
If sounds really good.
I synced the carbs and started cleaning it up today.
I love the sound of the Harley mufflers on those pipes.
I can't wait for a warmer day to go for ride now.
I might ride this more than the old wing in the shop.
I am really starting to get excited with this one.