Gl1100 Weber 40 idf jetting help

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Sman74
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Gl1100 Weber 40 idf jetting help

#1

Post by Sman74 »

I am going to install a pair of true Weber 40idf carburetors, made in Spain, on my gl1100. I was wondering if anyone would be able to help me with a starting point on the jetting ? The carburetors are used and I am going to clean and rebuild them and wanted to install the jetting that would get me close. I have jardines on the bike that have had the muffler section shortened and now have one set of baffles in them. Thanks for any help in advance, Steve
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gltriker
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Re: Gl1100 Weber 40 idf jetting help

#2

Post by gltriker »

I have no idea.
Scroll down this page to Similar Topics. I see one down there, that is 5 pages long. tumb2
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Re: Gl1100 Weber 40 idf jetting help

#3

Post by wingrider »

Welcome to the forum! Who’s manifolds are you running? If Randakk, he provides a guideline for jetting. The pipes you will find do not effect as much as some think.
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Re: Gl1100 Weber 40 idf jetting help

#4

Post by Sman74 »

I tried getting them from Randakk but they were sold out. I had someone with a milling machine make me some that look just like Randakk’s. I tried to get randakk to sell me the instructions that come with his manifolds and they wouldn’t sell them.
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Re: Gl1100 Weber 40 idf jetting help

#5

Post by gregforesi »

This is for my 1000 - I'm running 50 idle, and 115 mains with 135 air correctors. Randakk's start point was 47 idle, 110 mains and 185 air correctors (for the 1000). I run velocity stacks with screens and currently a Delkevic exhaust that's pretty open. I had the bike on a dyno a few years ago and it was going very lean at the top end so that's why my air correctors are so small.
Soldering jets closed and opening them up with $1 drills is far cheaper than collecting jets.
There is at least one Canadian 1100 here that is running Webers. The Rat will know who it is.
Because the linkages contra-rotate they are tough to get the angles correct. It would be easier to hook them up with a splitter (BMW?). I know I don't have the Randakk instructions anymore but the throttle geometry in the instructions was my work.
2006 GL1800 (Brutus Maximus)
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Re: Gl1100 Weber 40 idf jetting help

#6

Post by Sman74 »

Thanks a million for the help. Will the 1100 jetting be similar ?
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Re: Gl1100 Weber 40 idf jetting help

#7

Post by robin1731 »

Sman74 wrote: Sat May 22, 2021 10:32 pm Thanks a million for the help. Will the 1100 jetting be similar ?

It might be a good place to start. Many variables go in to jetting. Two bikes set up "identical" might need different jetting. Then location plays a huge part also. You need to know how to read plugs to get proper jetting. ;) anim-cheers1
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Re: Gl1100 Weber 40 idf jetting help

#8

Post by gregforesi »

Without sticking it on a dyno and reading the exhaust gases, reading the plugs is next best. Because the Webers don't have a midrange circuit the transition between the idle circuit and the mains can be tricky to call. As I said, mine was running out of gas at top end so the fix to richen it was smaller air correctors.
If it falls on it's nose when leaving a light under full throttle (sorry Robin) the accelerator pump has the biggest influence. Randakk called for 5mm of thread showing on the accel pump adjusters. I'm at about 9mm. Once again, mine just likes more gas. Fuel mileage has always been around 33mpg but I've been known to get it down around 27 on good days. Unless a Harley has about $5k into the correct parts it's good night Irene (sorry again Robin). The 27mpg that causes is a very worthwhile investment and results in a big grin.
2006 GL1800 (Brutus Maximus)
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
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Re: Gl1100 Weber 40 idf jetting help

#9

Post by Sman74 »

Thank you very much I really appreciate the help
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Re: Gl1100 Weber 40 idf jetting help

#10

Post by Rat »

gregforesi wrote: Sat May 22, 2021 4:56 pm This is for my 1000 - I'm running 50 idle, and 115 mains with 135 air correctors. Randakk's start point was 47 idle, 110 mains and 185 air correctors (for the 1000). I run velocity stacks with screens and currently a Delkevic exhaust that's pretty open. I had the bike on a dyno a few years ago and it was going very lean at the top end so that's why my air correctors are so small.
Soldering jets closed and opening them up with $1 drills is far cheaper than collecting jets.
There is at least one Canadian 1100 here that is running Webers. The Rat will know who it is.
Because the linkages contra-rotate they are tough to get the angles correct. It would be easier to hook them up with a splitter (BMW?). I know I don't have the Randakk instructions anymore but the throttle geometry in the instructions was my work.
BFF9533A-5DEF-43A4-88C2-25B1B39BF284.jpeg
BFF9533A-5DEF-43A4-88C2-25B1B39BF284.jpeg (345.27 KiB) Viewed 2594 times
Bike built by Oldwing in Cambridge Ontario as opposed to Oldewing in Columbus

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Re: Gl1100 Weber 40 idf jetting help

#11

Post by gregforesi »

Not that one Gord. When we did the Manitoulin run he was there. Machinist, Mechanic, a name like that I think. Millwright!!!
2006 GL1800 (Brutus Maximus)
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
"So how much you gonna spend to win that $5 trophy?" - Cyborg
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Re: Gl1100 Weber 40 idf jetting help

#12

Post by Sman74 »

That’s a cool bike. What number emultion tubes should I be using ? The carburetors came with f7 tubes
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Re: Gl1100 Weber 40 idf jetting help

#13

Post by wingrider »

Millwright was the one
2002 1800 Wing
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Re: Gl1100 Weber 40 idf jetting help

#14

Post by Sman74 »

Emulsion tube size ?
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Re: Gl1100 Weber 40 idf jetting help

#15

Post by Rat »

Here’s an old Millwright thread ...

https://ngwclub.com/forum/viewtopic.php ... 11#p491311

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‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
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