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Hi. I recently took off my carbs to clean, repaint and hopefully make a performance improvement. Nothing was wrong with the performance before except it maybe ran a bit on the lean side. I finished the project and started the bike, it's running rough and the 2nd cylinder is not firing. It seems to clear up at higher RPM I'm assuming due to the jetting. I pulled the plug and checked it, it's good. It has great compression. I took out the pilot screws to make sure I got everything clean. The book says if the pilot screws are disturbed to reset them at 1 1/4 turns out. I know I need to sync but to not get any gas at all in low RPM is odd. My question is, is there a particular passage that could be plugged? Or is it common for the 2nd carb to have a pilot screw setting much different than the other 3 due to being the vacuum source as well?
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"The Hooligan" XJ1100, Virago Gauge Pods, Screaming Eagle Mufflers, K&N Filter, hand made rear fender, side covers, and solo seat, round bar conversion, small headlight, tail light, and cat eye turn signals, chip fuses, rewired the right way.
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Hey Jeepster, i had the same problem with mine when i got it. The carbs had been gone through, and it ran great above about 2000. Got good mileage as well. What i found when i adjusted the carbs, is that number 2 was set only at a quarter out. After readjusting, and synching the problem was gone. Don't rule out the synch as being the problem though.1980 XS1100LG Midnight
1991 Honda CBR1000F Hurricane
"The hand is almost valueless at one end of the arm if there be not a brain at the other"
Here's to a long life and a happy one.
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did you check and adjust your floats?
I don't think its common for #2 to be different from the other three but it is common for each cylinder to be a bit different. When mine runs its best there is about 1/2 turn difference between my "tightest" idle screw and my "loosest" idle screw.
My recommendation and i'm sure others will put in their 2 cents is that you should spend the time to balance your carbs and read the tech tip on how to adjust the idle screw. 1 1/4 turns is just a rough starting point, from there you need to tune each carb to get the best results.
I usually adjust idle screws -> balance carbs -> adjust idle screws -> check balance again and adjust if needed -> go for a ride!1979 xs1100 Special -
Stock air box/K&N Filter, MAC 4-2 exhaust, Bad-Boy Air horn, TC fuse box, Windshield, Soft bags, Vetter Fairing, Blinkers->Run/Turn/Brake Lights, Headlight Modulator, hard wire GPS power
Short Stack - 1981 xs1100 Standard - lowered for SWMBO.
My Bike:Originally posted by fredintoon
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Thanks guys, the conformation helps. I think I'll go ahead and do a float level adjustment instead of just measuring the floats. It really helped on my dirtbike. Then I'm going to make a vacuum tube sync tool since I already have the gauge. I kind of figured the pilot screws were to blame. There's no way the carb bodies and compression and all that could be identical. I'm just a little impatient cause I've had to remove them 3 times already, and my paint got all messed up from messing with them."The Hooligan" XJ1100, Virago Gauge Pods, Screaming Eagle Mufflers, K&N Filter, hand made rear fender, side covers, and solo seat, round bar conversion, small headlight, tail light, and cat eye turn signals, chip fuses, rewired the right way.
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Pilot Jets
If all else fails, look for a loose pilot jet.I've seen this happen on more than one occasion.78 XS1100E Standard
Coca Cola Red
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1979 XS1100 Special
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1980 XS Standard
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Sounds like a pilot jet to me. The main jets kick in at 2k-2500 rpm. Anything under that and the pilot jets are doing the work.
If it makes any difference, my mixture screws are all at 4+ turns out. 1.25, and they would be choking!
1980 XS850SG - Sold
1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).
Whether you think you can, or you think you cannot - You're right.
-H. FordComment
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That helps. Well, I resprayed the carbs today, I'm gonna let em cure real good before messing with them again. I love my midnight but the black theme sure can be a pain. This time around I'll sync them much better."The Hooligan" XJ1100, Virago Gauge Pods, Screaming Eagle Mufflers, K&N Filter, hand made rear fender, side covers, and solo seat, round bar conversion, small headlight, tail light, and cat eye turn signals, chip fuses, rewired the right way.
Pics: http://s1236.photobucket.com/user/ya...?sort=6&page=1Comment
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Huh?? What are you letting "cure"?Originally posted by jeepsterluv View Post
1980 XS850SG - Sold
1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).
Whether you think you can, or you think you cannot - You're right.
-H. FordComment
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The paint. I'm trying to make it pretty."The Hooligan" XJ1100, Virago Gauge Pods, Screaming Eagle Mufflers, K&N Filter, hand made rear fender, side covers, and solo seat, round bar conversion, small headlight, tail light, and cat eye turn signals, chip fuses, rewired the right way.
Pics: http://s1236.photobucket.com/user/ya...?sort=6&page=1Comment
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