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Hello all - I'm a relatively new owner of an '79 XS1100 and am putting K&N air pods on instead of the old air box. From what I understand I need to swap out the main jets with bigger ones. Any idea what size I should use? And is it really that simple - just put in new main jets and that's all? Thanks!
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Jets
Yes and no. Look in the Tech Tips, there are some recomdations on what to bump them up. The stock jets are 137.5's and they go up in increments of 2.5. Do you have aftermarket exhaust pipes? The tech tips are at the bottom of the form page and are broken down into maintaince, repairs, and modifications. I started a notebook of threads because there are a lot of tips on working on carbs (a common subject for some reason. LOL) and tips on making things easier by those who have suffered before
Congrats to you on your new ride and Good Luck!
Tim1979XS1100SF
K&N's and drilled airbox
Jardine 4in1
Dunlop Elite 3's
JBM slide diaphragms
142.5 main jets
45 pilot jets
T.C.'s fusebox & SOFA
750/850 FD mod.
XV 920 Needle Mod.
Mike's XS plastic floats set at 26mm
Venture Cam Chain Tensioner -
Jets
The tip you are looking for is in Modifications; carburators and fue systems and is titled jetting recomendations.1979XS1100SF
K&N's and drilled airbox
Jardine 4in1
Dunlop Elite 3's
JBM slide diaphragms
142.5 main jets
45 pilot jets
T.C.'s fusebox & SOFA
750/850 FD mod.
XV 920 Needle Mod.
Mike's XS plastic floats set at 26mm
Venture Cam Chain TensionerComment
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There is a thread if you go to
-mainpage-maintainance section,carburetors-Blaines carb facts
he talks about changing jets.There is some good info there.He claims that unless you change copression ratio or other internal mods you should be able to adjust float level to make up for aftermarket air filters.You can make a difference with pilot screws
too,on some year Xs11's the pilot affects all flow ranges.80 SG XS1100
14 Victory Cross CountryComment
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That thread is helpfull, but there is a possibility that you won't need to re-jet. It isn't going to make a large enough difference that you'll be in danger of seizing the motor.... so throw on the pod filters and do a plug check. Take a plug wrench with you and go for a ride. After it is warmed up all the way, make a run and keep the rpm over 4k so only the main jets are involved. Pull in the clutch and immediately hit the kill switch... coasting to the side of the road and stop. Pull the plugs and check them.... if white, it is too lean. If black... too rich. Got some tan on there?? Just right!
I'd do this before I went out wasting money on the jets first.
TodTry your hardest to be the kind of person your dog thinks you are.
You can live to be 100, as long as you give up everything that would make you want to live to be 100!
Current bikes:
'06 Suzuki DR650
*'82 XJ1100 with the 1179 kit. "Mad Maxim"
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'82 XJ1100 Bagger fixer-upper
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*Crashed/Totalled, still ownComment
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