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Old 04-03-2017, 07:47 PM
Padre4art Padre4art is offline
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Angry Triple fuel problems

Ok, rebuilt carbs and petcocks over the winter. Tried to take my bride for a ride yesterday, first time fueled up this year. Our 35th anniversary.

1). Two right side carbs overflow badly while running. Not while turned off. Do not overflow when petcock is on prime while engine turned off. Float level?

2) Tank was leaking from underside also. Turned out to be crumbling fuel sender gasket.

3). While testing for tank leak, tested petcocks. One still leaks with engine off. I am thinking diaphragm with o-ring is not sealing. I rebuilt these during the winter following very detailed directions, including polishing the seats. Ideas?

Any help with carb overflow problem or petcock drip problem?

Very frustrated. Ready to move on to something fuel injected!

thanks

Art
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Old 04-03-2017, 08:24 PM
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Schming Schming is offline
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Hi Padre,

This is the tutorial I used to rebuild the petcocks on my bikes as they were not sealing either.

It's real important to resurface the castings and get them true.

http://xjbikes.com/forums/threads/re...-w-pics.25058/

They all work well now.

Hang in there you'll get it.
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1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
1979 XS1100SF (stock-euro mods planned)
1984 XV700L Virago (to be hot-modded)
1983 XJ750MK Midnight Maxim (semi-restored DD)
1977 XS650D ( patiently awaiting resto)

Sometimes it takes a whole tank of gas before you can think straight.

Last edited by Schming; 04-03-2017 at 08:27 PM.
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  #3  
Old 04-03-2017, 09:26 PM
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bikerphil bikerphil is offline
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As for the flooding carbs, try tapping on the float bowls when they are filling, use a screwdriver handle or such. The floats can stick all the way down.
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  #4  
Old 04-04-2017, 07:09 AM
mack mack is offline
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Drop tangs

You adjusted the drop tangs right?
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81 XS 1100 LH MNS
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78 XS 11E
IOTA
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Old 04-04-2017, 08:45 AM
Padre4art Padre4art is offline
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Hi - yes - I adjusted the drop tangs. I felt there was not enough float drop before and adjusted to give about 10 mm of float drop. Could not find a specification for float drop anywhere. Any ideas?

Thanks guys for all the help! Love this site!

Art
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Old 04-04-2017, 09:07 AM
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DiverRay DiverRay is offline
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Make sure of two things!
1. The VENT LINE is open! a spider or bug can crawl in if it's just open. and the vent does not work anymore. This WILL make it flood. I worked on a '78 in like new condition about 10 years ago, and that was the cause of flooding.
2. Check the FLOAT BOWL GASKET. If they are not trimmed, the float can catch and hang on them, causing flooding.
Good hunting, and try to start and/or ride it at least once a month. Let it warm up and it will keep most of the problems from showing up.
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Old 04-08-2017, 08:04 AM
mack mack is offline
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The best way

I've found to check the action of the drop tangs is before you put the bowls on just lift the carbs up and rock them front to back and watch to make sure the floats don't hang up on the posts. If the tangs aren't set right, the float will stick on the bottom of the post. The comments on trimming the bowl gaskets and making sure the fuel and vent t's are clear are also standard procedure for these carbs.
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79 XS 1100 SF Special
HERMES
original owner
http://i946.photobucket.com/albums/a...ps6932d5df.jpg

81 XS 1100 LH MNS
SPICA
http://i946.photobucket.com/albums/ad305/mack-055/2.jpg

78 XS 11E
IOTA
https://youtu.be/wB5Jfbp6SUc
https://youtu.be/RaI3WYHSuWA



Have recovery trailer and shop if you breakdown in my area.
Frankford, Ont, Canada
613-398-6186
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  #8  
Old 04-10-2017, 05:14 PM
Padre4art Padre4art is offline
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Thanks guys for good suggestions.

Found: vent tube in air box at least partly blocked. Float seat gasket egg shaped. Hoping for the best now for reassembly.
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