Just wondering how and why people drill out their airbox? What are the pro's and con's?
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Drilled Airbhox???
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Drilled Airbhox???
Some make 'em, most just make payments on 'em!
1978 XS 1100E
Vance & Hines Slip on Straight Shot Exhaust
K & N Air filter
Home built forward controls
Vulcan Mustang seat
A little chopped
http://s812.photobucket.com/albums/zz42/Brad_099/Tags: None
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It's about increasing airflow through the filter. In stock trim the only intake is through the snorkel under the seat and some people feel that just isnt enough so they drill the underside of the air box to let more through. Personally I dont have problems with the stock setup and think it lets plenty of air in for the engines needs, but those who insist on making things 'better' swear by it.
There are also those who believe that it can let water in to the intake, but this is largely false, as the holes don't go directly into the filter housing, but rather into the plenum box underneath, but a little water misting into the intake isnt a bad thing anyway, as long as its misting and not whole droplets.1980 SG. (Sold - waiting on replacement)
2000 XJR1300. The Real modern XS11. Others are just pretenders.
Woman (well, my wife anyway) are always on Transmit and never Receive.
"A man should look for what is, and not for what he thinks should be" Albert Einstien.
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Mine had holes when I got it.Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore Roosevelt
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I run both my stock 79 air boxes with two 1" holes in the bottom center, cut back snorkel, and a K&N, better breathing totally, works for me.2H7 (79) owned since '89
3H3 owned since '06
"If it ain't broke, modify it"
☮
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Thanks for the info, I have a K & N and even with my fuel idle mixture screws all the way in, it runs rich. Maybe the extra hole might help.Some make 'em, most just make payments on 'em!
1978 XS 1100E
Vance & Hines Slip on Straight Shot Exhaust
K & N Air filter
Home built forward controls
Vulcan Mustang seat
A little chopped
http://s812.photobucket.com/albums/zz42/Brad_099/
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Originally posted by Brad View PostThanks for the info, I have a K & N and even with my fuel idle mixture screws all the way in, it runs rich. Maybe the extra hole might help.2H7 (79) owned since '89
3H3 owned since '06
"If it ain't broke, modify it"
☮
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Originally posted by bikerphil View PostCould be a lot of things causing a rich condition including a weak spark. You could try running it temporarily with the bottom of the air box off, see if that helps, JAT.Last edited by Brad; 04-24-2011, 10:00 PM.Some make 'em, most just make payments on 'em!
1978 XS 1100E
Vance & Hines Slip on Straight Shot Exhaust
K & N Air filter
Home built forward controls
Vulcan Mustang seat
A little chopped
http://s812.photobucket.com/albums/zz42/Brad_099/
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Originally posted by Brad View PostThanks for the info, I have a K & N and even with my fuel idle mixture screws all the way in, it runs rich. Maybe the extra hole might help.
if u can screw the mixture screws all the way in (gently seated) without the
bike stalling at idle, sounds like ur pilot jets could be to big,
have u changed them out from stock, some after market kits
that have 42.5 stamped on the pilots are the wrong ones and
run much richer than the stock pilots. jat.pete
new owner of
08 gen2 hayabusa
former owner
1981 xs1100 RH (aus) (5N5)
zrx carbs
18mm float height
145 main jets
38 pilots
slide needle shimmed .5mm washer
fitted with v/stax and uni pod filters
[url]http://www.youtube.com/watch?v=3pA8dwxmAVA&feature=mfu_in_order&list=UL[/url]
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It could be the carbs are out of synch or the idle circuit is plugged up and the throttle plates have to be opened so far that the transition ports are beginning to be uncovered.
The mixture screws can't adjust the transition ports, only the idle ports and it'll be too rich; three holes extra feeding fuel instead of just the one.-- Scott
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♬
2004 ST1300A: No name... yet
1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
1979 XS1100SF: "Bush" W.I.P.
1979 XS1100F: parts
2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.
♬
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Originally posted by 3Phase View PostIt could be the carbs are out of synch or the idle circuit is plugged up and the throttle plates have to be opened so far that the transition ports are beginning to be uncovered.
The mixture screws can't adjust the transition ports, only the idle ports and it'll be too rich; three holes extra feeding fuel instead of just the one.
but if the bike was at idle (1100rpm or lower) and all 4 mixture screws were screwed in at the same time
and that made no difference to the idle or it increased it, then
it would be more likely that the pilot jets are to big,
but for sure u would still want the carbs synced to be certain.pete
new owner of
08 gen2 hayabusa
former owner
1981 xs1100 RH (aus) (5N5)
zrx carbs
18mm float height
145 main jets
38 pilots
slide needle shimmed .5mm washer
fitted with v/stax and uni pod filters
[url]http://www.youtube.com/watch?v=3pA8dwxmAVA&feature=mfu_in_order&list=UL[/url]
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Mine aren't drilled and it runs fine. There are definitely aspects of the bike which benefit from being made 'better' than the OEM spec eg rectifier/regulator, coils, fusebox etc but I'm not sure that drilling holes in the airbox is one of them. I don't like the idea drilling great big holes in an airbox that's surviuved 30 years unscathed. I've not fitted a front mudflap for the same reason. They all seem to need drilling of the fender!XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.
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There are definitely aspects of the bike which benefit from being made 'better' than the OEM spec eg rectifier/regulator, coils, fusebox etc but I'm not sure that drilling holes in the airbox is one of them. +1 England,and not just for proper look either. There's more to the innards by design for efficient air flow and correct velocity matching with the sidedraft carbs than meets the eye. Same goes for the stock exhaust where each 2 into one meets. In stock form, most power through ALL rpm ranges IS achieved in stock original configuration. Although some don't have alot of choice when putting them back on the road.81H 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.
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Originally posted by motoman View PostAlthough some don't have alot of choice when putting them back on the road.
Some sort of afterthought mufflers had been (ahem) "welded" on, and that was before it had been laid down!
The airbox was an abortion, the tank caved in on the side, engine side covers gouged , RTV IN THE CARBS!!! fer cryin' out loud!! What some people will do to a bike.......
I accuired this bike free of charge, but have no realistic tally of how much money I've put into it, and have not kept track of the hours.
If for no other reason, if and when I do find myself with a different bike, this one will never leave my stable for all of the blood sweat and tears I've put into it making it right and making it mine. I've had many bikes, but never more than one at a time (the wife and kid's notwithstanding). Part of what may be considered my soul went into this machine, and still does.'78 E "Stormbringer"
Purrs like a kitten, roars like a lion, runs like a gazelle (being chased by a cheetah).
pics http://s1209.photobucket.com/albums/...tormbringer45/
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Originally posted by petejw View Posti agree if it was 1 or 2 carbs that were doing it ....
I guess I'm agreeing with the jets being to rich but didn't write it clearly.-- Scott
_____
♬
2004 ST1300A: No name... yet
1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
1979 XS1100SF: "Bush" W.I.P.
1979 XS1100F: parts
2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.
♬
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Originally posted by 3Phase View PostYebbut if it's jetted too rich you have to open the throttle plates farther to get enough air to run at the correct idle speed. That starts to uncover the transition ports and then your mixture screws don't work any more on any of the carburetors.
I guess I'm agreeing with the jets being to rich but didn't write it clearly.
i dont write clearly at the best of times. :-)pete
new owner of
08 gen2 hayabusa
former owner
1981 xs1100 RH (aus) (5N5)
zrx carbs
18mm float height
145 main jets
38 pilots
slide needle shimmed .5mm washer
fitted with v/stax and uni pod filters
[url]http://www.youtube.com/watch?v=3pA8dwxmAVA&feature=mfu_in_order&list=UL[/url]
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