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I had my '80 special in the shop 8 months ago for valve adjust and carb adjust/synch. they removed (for the very first time since new) the factory original aluminum(?) plugs covering the mixture screws and when the tech was done he put some clear rtv into the holes covering the screws again. bike has run like a new one ever since but I noticed today that one of the rtv "plugs" was loose so I just pushed it back into its hole. are these "plugs" needed for proper carb function? any problems if they were not there? thanks
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While the remote possibility exists that something could leak into the hole, the reason for those aluminum caps were to prevent riders from messing with the factory settings. If u notice in the manual, it says not to mess with them. I guess Yamaha never figured that we'd be knowledgeable to learn proper stoichiometric mixtures.1979 XS1100F
2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights. -
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.......and back in the day, dealers had the tin replacements after doing a sync to further discourage the curious.Originally posted by IanDMacDonald View Post81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.Comment
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I think it's Japanese for "please leave it the hell alone". but I could be wrong
however, it doesn't answer my question. if those plugs are not there will the air/fuel mixture be effected?Comment
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no it won'tSeamus Ó hUrmholtaigh
Niimi Moozhwaagan
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Member of "FOXS-11" (Former Owner of XS-11)
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2008 Nomad "Deja Buick'Comment
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They were there on 1 of my bikes ( before I found out what to do ) to waste fuel. Had to keep the enrichener full open for 2 mi. and then another 2 mi. on half. So by the time I hit the slab 4 mi. down the road from home the bike was ready to rock, BOUGHT NEW ! Never had a bit of trouble other than this so I guess the jetting was rich enough to keep from holing a piston.Originally posted by IanDMacDonald View Post76 XS650 C ROADSTER
80 XS650 G Special II
https://ibb.co/album/icbGgF
80 XS 1100 SG
81 XS 1100LH/SH DARKHORSE
https://tinyurl.com/k6nzvtw
AKA; Don'e, UD, Unca Don'eComment
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They run fine without them. Only issue I ever had was when one of my springs on that screw was loose, one of my mixture screws apparently vibrated loose, and out, while at XSEast last year.
Not something easy to see and diagnose. Also not something you pick up at o-Reillys or Autozone.
But I have never put them in any carbs I have worked on.Life is what happens while your planning everything else!
When your work speaks for itself, don't interrupt.
81 XS1100 Special - Humpty Dumpty
80 XS1100 Special - Project Resurrection
Previously owned
93 GSX600F
80 XS1100 Special - Ruby
81 XS1100 Special
81 CB750 C
80 CB750 C
78 XS750Comment
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I put a small dab on mine to keep them from vibrating loose. Doubt they would but a little spot of rtv is cheap insurance.Nate
78 XS11 "Matilda" 2H7 000364
2001 Raptor ACCT, T.C. Fuse Box, TC Bros Forward Controls
Kuryakyn Iso Grips/Throttleboss/Bar End Mirror, Custom Covered Seat
Shinko 712s, HID Headlight, RC Performance Exhaust
Bikemaster Daytona Handlebars, Galfer SS Brake Lines
Barnett HD Clutch Springs, T.C. Spin On Filter Adapter
K+N Air Filter
88 Voyager XII
81 XJ650 MaximComment
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He could have done it for one of these 3 reasons or all...Originally posted by 650mark View Post
1. So the screws dont back out and hold their setting
2. So no air or water leaks in
3. Keep the owner out
Since they have an o-ring #2 isnt a problem, I'd dare say it was primarily #3. Should'a asked him.
It's not a bad idea, eliminates one possible variable if you start having issues with the bike. I'd do it to mine if I had the later carbs...Last edited by WMarshy; 06-17-2013, 04:26 AM.'79 XS11 F
Stock except K&N
'79 XS11 SF
Stock, no title.
'84 Chevy K-10 "Big Blue"
GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws
"What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~Comment
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I think the reason for it is more likely to keep dirt and crap out. I have had to drill out at least one pilot jets, or mixture screw on about every single set of carbs I have had to work on. On the later model carbs, you never have issues getting those mixture screws out. But the later model carbs you get dirt and water in there and it tends to make then sieze up.Life is what happens while your planning everything else!
When your work speaks for itself, don't interrupt.
81 XS1100 Special - Humpty Dumpty
80 XS1100 Special - Project Resurrection
Previously owned
93 GSX600F
80 XS1100 Special - Ruby
81 XS1100 Special
81 CB750 C
80 CB750 C
78 XS750Comment
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