The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

Active Threads
0 Sportster Crankcase Pressure / Engine Breathing / Wetsumping and Mods
Last Post: bustert
Posted On: 1 Minute Ago
Replies: 887
Views: 40,164
0 Swingarms
Last Post: Jer
Posted On: 10 Minutes Ago
Replies: 4
Views: 180
0 hi all
Last Post: Stairman
Posted On: 10 Minutes Ago
Replies: 2
Views: 7
0 Keep & Kill
Last Post: Graywolf
Posted On: 24 Minutes Ago
Replies: 14,598
Views: 815,598
0 Race tracks are harsh environments
Last Post: rokytnji
Posted On: 34 Minutes Ago
Replies: 3
Views: 147
0 Hydraulic Lift For XL
Last Post: Iron Mike
Posted On: 34 Minutes Ago
Replies: 8
Views: 197
0 question for our machinists
Last Post: Iron Mike
Posted On: 1 Hour Ago
Replies: 9
Views: 295
0 Fact or fiction?
Last Post: bustert
Posted On: 1 Hour Ago
Replies: 20
Views: 665
0 never mind
Last Post: IXL2Relax
Posted On: 2 Hours Ago
Replies: 71
Views: 3,611
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Graywolf
Posted On: 2 Hours Ago
Replies: 45,682
Views: 7,220,240
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 15,335
Views: 1,472,850
0 Crusty's Travels
Last Post: SonWon
Posted On: 5 Hours Ago
Replies: 2,652
Views: 358,479
12 Lets see the "C's" XLC's that is. Pics Please!
Last Post: glbsportster
Posted On: 7 Hours Ago
Replies: 1,212
Views: 448,710
0 supply oil line seeping
Last Post: Hippysmack
Posted On: 8 Hours Ago
Replies: 4
Views: 179
0 Cometic Air Cleaner Gasket?
Last Post: sml1226
Posted On: 8 Hours Ago
Replies: 1
Views: 48
0 Fork Upgrade to 39mm. Is This Possible/Wise
Last Post: BKB
Posted On: 9 Hours Ago
Replies: 7
Views: 159
0 1982 XLH 1000 With 23 Original Miles
Last Post: ryder rick
Posted On: 10 Hours Ago
Replies: 8
Views: 397
0 Very Loud Backfiring (among other things)
Last Post: Nacs
Posted On: 11 Hours Ago
Replies: 15
Views: 404
0 Wanna build a cheap big bore stroker ?
Last Post: Maxeffort
Posted On: 12 Hours Ago
Replies: 35
Views: 1,291
0 Pre-rubber stock exhaust to '08 heads and cylinders
Last Post: olrider
Posted On: 13 Hours Ago
Replies: 7
Views: 177
0 Interview of My Expieriences Riding in the Iron Butt Rally
Last Post: sportsterpaul
Posted On: 14 Hours Ago
Replies: 5
Views: 177
5 Crankcase Oil Drain Plug
Last Post: Hippysmack
Posted On: 14 Hours Ago
Replies: 13
Views: 439
0 Winter riding clothes
Last Post: sportsterpaul
Posted On: 14 Hours Ago
Replies: 34
Views: 3,235
0 Question on priming motor for kickstart
Last Post: Iron Mike
Posted On: 14 Hours Ago
Replies: 9
Views: 494
0 Charging cell phone when camping?
Last Post: kobra50
Posted On: 14 Hours Ago
Replies: 68
Views: 19,743
5 Your worst car?
Last Post: Nibelungen
Posted On: 14 Hours Ago
Replies: 299
Views: 34,147
0 Ride Report w/ 100's of Photos & Video - 8 States, 2 Countries & 2 Big Surprises
Last Post: DK Custom
Posted On: 14 Hours Ago
Replies: 28
Views: 790
3 Wtb, Wts, Wtt, Wtg (Ironhead)
Last Post: dodgetrucken
Posted On: 15 Hours Ago
Replies: 65
Views: 241,616
5 73 Timing w/Strobe & 77 air/fuel screw
Last Post: 4th of July
Posted On: 15 Hours Ago
Replies: 16
Views: 584
0 Speedometer Interchangeability Between Different Generations.
Last Post: 619Sporty
Posted On: 15 Hours Ago
Replies: 3
Views: 118
More...
Tags
high speed, leak, overflow, super b

Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #31  
Old 27th June 2019
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
XL FORUM TEAM MEMBER
 
Join Date: Jun 2009
Location: Sunshine Coast
Posts: 4,704
Sportster/Buell Model: XLB, XLCH, Sporton
Sportster/Buell Year: 1962
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1966
Other Motorcycle Model: XLCH (Another one)
Other Motorcycle Year: 1966
Reputation: 735624
Ferrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond repute
Default

I have run an open velocity stack on my sidecar for years and never had a problem. I think if you look at Leo Payne's Turnip Eater you'll see he ran one too. And Rayborn went 246 MPH with an open bell mouth.
I do know that still air boxes do improve JP. Used to use them on my Kawasaki Superbike.
And S&S did move the air bleed from left to right side between the GAL and the MGAL but I'm not sure that was related to venturi effect problems with the bleed.

I asked about the gasket change and jet changes as something appears to be pressurizing the inside of the carb to force fuel out the sir bleed. I think this is why a few people are thing it's reversion.
But if it's reversion it would be possible to see this with the bike sitting still. Att whatever revs the reversion happens it will happen in any gear r even in neutral.

I do not believe that if your under4000 in top gear your going fast enough to have any effect on the carburetors functional ability.
In the lower gears you may be going through the rev range where yjr msain jet kicks in too quickly to notice that it's happening ?

Quote:
The pickup tube was damaged and had to be replaced.
That makes me wonder.

At around 3000-3500 both the intermediate and main jets are working. This often causes a too rich area in the A/F ratio. But can't see how exactly that would relate to the problem.

Quote:
i had bought an aftermarket rebuild kit that need some massaging to properly function.
So the discharge tube was replaced as well ?

I would pull the discharge tube and examine it carefully. The air bleed feeds into the chamber surrounding the atomizer section of the discharge tube. Fuel should be getting drawn up the tube into the throat of the carburetor, not forcing itself out through the air bleed passage.
It;s as if the signal is strong enough to pull the fuel up correctly but the passage is restricted and not allowing all the fuel to pass through.

I can't see where you mention jet sizes. But I did note that you have "no flat spots" with unequal length straight trough pipes.
So I am wondering if you do have way too big an intermediate jet in there.

Don't know if the engine is basically stock or not but should probably be running something like 68 and 270.

I'm guessing the drag pipes are purely for looks but you will be losing around 10-12 hp in the mid range with that set up. And that's not 10-12 hp at max HP that's off whatever the engine makes in the mid range.
__________________
"I know only too well the evil that I propose. But my inclinations get the better of me."
Reply With Quote
  #32  
Old 2 Weeks Ago
rickmodee rickmodee is offline
Greasemonkey
 
Join Date: Feb 2014
Posts: 105
Sportster/Buell Model: xlch
Sportster/Buell Year: 1975
Other Motorcycle Model: fx
Other Motorcycle Year: 77
Reputation: 10360
rickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of light
Default

I just want to give a final update on my woes with this conundrum.


So I figured this out about a month ago probably more but this personal triumph brought mixed feelings in the interim. At first I was ecstatic, relieved, then.... feeling somewhat sheepish after I cracked the code. I went out to Lancaster PA about 150 miles out from my home, just pissing gas through the overflow the whole ride there. (the ride home was cheaper gas wise) side note: I also swapped my front sprocket to a 23t, I know I'm getting off track. Anyway.. because of that swap I decided to hop on the interstate and cover some ground quick as opposed to my leisure county road rip out. About 15 miles in I was getting uncomfortable and moving my ass around on the seat. (rigid rear) and then it happens

The god damn bowl isn't leaking, 4th gear 3k rpm so I start moving around making sure my eyes are deceiving me. Turning my hands into a brim to make sure its not some dumb reflection thats throwing me off. As I'm doing that it starts leaking again. Then it hits me. Is it my xxxxing knee? Holy shit, its my xxxxing knee, my knee is making my fuel bowl leak.

My regular riding position has my knee positioned right behind the stack and it cause some sort of a blockage of air or vacuum causing my bowl to leak. As I move it away free and clear no leak.

I must've taken that carb off about 20 times just checking things and scratching my head.
__________________
2000 xl,1975 xlch
Reply With Quote
  #33  
Old 1 Week Ago
brucstoudt's Avatar
brucstoudt brucstoudt is offline
Senior Master Custom Bike Builder
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 13,425
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Reputation: 301290
brucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond repute
Default

thanks for the update.twice it was mentioned to try running with an air cleaner.i assume that wasn't tried?
__________________
72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
Reply With Quote
  #34  
Old 1 Week Ago
rickmodee rickmodee is offline
Greasemonkey
 
Join Date: Feb 2014
Posts: 105
Sportster/Buell Model: xlch
Sportster/Buell Year: 1975
Other Motorcycle Model: fx
Other Motorcycle Year: 77
Reputation: 10360
rickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of lightrickmodee is a glorious beacon of light
Default

Quote:
Originally Posted by brucstoudt View Post
thanks for the update.twice it was mentioned to try running with an air cleaner.i assume that wasn't tried?
You are correct. It was something i planned to try but didn't have access to a stock air cleaner without purchasing one. But also wanted to figure out the issue with the current setup and not just give up on it. Even though the stock s air cleaner is definitely a better choice for a street application
Reply With Quote
  #35  
Old 1 Week Ago
RicThompson RicThompson is offline
Biker
 
Join Date: Sep 2019
Posts: 72
Sportster/Buell Model: XLH
Sportster/Buell Year: 1969
Other Motorcycle Model: 04 Ironhorse Outlaw
Other Motorcycle Year: 2004
Reputation: 199
RicThompson is on a distinguished roadRicThompson is on a distinguished road
Default

Just curious why you run an open velocity stack? On the drag strip I can see it. On anything else though?
Reply With Quote
  #36  
Old 1 Week Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
XL FORUM TEAM MEMBER
 
Join Date: Jun 2009
Location: Sunshine Coast
Posts: 4,704
Sportster/Buell Model: XLB, XLCH, Sporton
Sportster/Buell Year: 1962
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1966
Other Motorcycle Model: XLCH (Another one)
Other Motorcycle Year: 1966
Reputation: 735624
Ferrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond repute
Default

I run an open bell mouth on my sidecar. And I found out early on that when I hang off ib the rights my right knee very neatly covers it.
But my engine coughs badly whenever I do that. And I get a huge amount of fuel coming out.
Reply With Quote
Sponsored Links
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Sponsored Links
All times are GMT +1. The time now is 15:16.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC