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 > Frame Mount EVO Sportster Talk (1986-2003 models)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

Active Threads
0 Keep & Kill
Last Post: Crusty
Posted On: 1 Minute Ago
Replies: 30,795
Views: 1,804,445
0 Vapor Lock and the Super E
Last Post: Jeff
Posted On: 12 Minutes Ago
Replies: 9
Views: 238
0 KT - 2022 - Show A Little Backbone
Last Post: IXL2Relax
Posted On: 22 Minutes Ago
Replies: 47
Views: 7,692
0 Blown Lights, WHY?
Last Post: Ferrous Head
Posted On: 1 Hour Ago
Replies: 18
Views: 480
0 2 capacitor questions
Last Post: IronHeadRon
Posted On: 1 Hour Ago
Replies: 4
Views: 93
0 Not sure what to do next
Last Post: Hippysmack
Posted On: 1 Hour Ago
Replies: 156
Views: 13,595
0 1979 1000xlh front drive (chain) sprocket tourque
Last Post: Hardtail28
Posted On: 1 Hour Ago
Replies: 12
Views: 388
0 winding idle up excessively to start bike.
Last Post: 73HEAD
Posted On: 1 Hour Ago
Replies: 64
Views: 3,026
0 Rebuilding and Tuning a S&S GBL carburetor
Last Post: CHOPTOP37
Posted On: 2 Hours Ago
Replies: 74
Views: 3,170
0 Allegheny National Park III
Last Post: BKB
Posted On: 2 Hours Ago
Replies: 271
Views: 32,994
0 how many run baffles, run open, or just run stock
Last Post: Stray Cat
Posted On: 2 Hours Ago
Replies: 416
Views: 104,597
0 New Brake Light Wiring Issues
Last Post: IronHeadRon
Posted On: 2 Hours Ago
Replies: 1
Views: 48
0 Ironhead and Owner - Post Yer Pics If You dare!
Last Post: backintoxls
Posted On: 2 Hours Ago
Replies: 213
Views: 65,067
0 Review: Mustang Solo Touring Saddle for 2004+ Sportsters
Last Post: sportsterpaul
Posted On: 3 Hours Ago
Replies: 1
Views: 30
0 Iree's late night cafe
Last Post: Stairman
Posted On: 5 Hours Ago
Replies: 2,352
Views: 461,894
0 trock transmission door
Last Post: SHAKY DAVE
Posted On: 5 Hours Ago
Replies: 4
Views: 230
0 Hello
Last Post: XL Ed
Posted On: 6 Hours Ago
Replies: 6
Views: 51
0 Birthday wishes to our resident Asgardian!
Last Post: wedge
Posted On: 7 Hours Ago
Replies: 8
Views: 120
0 Current projects (2 of them anyway)
Last Post: brucstoudt
Posted On: 8 Hours Ago
Replies: 72
Views: 5,993
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 8 Hours Ago
Replies: 38,753
Views: 4,970,487
0 My 2001 off-road Sportster 1200
Last Post: wedge
Posted On: 8 Hours Ago
Replies: 11
Views: 741
0 Reroute oil lines on my 1991?
Last Post: John Harper
Posted On: 8 Hours Ago
Replies: 6
Views: 133
0 cancer
Last Post: sportsterpaul
Posted On: 9 Hours Ago
Replies: 608
Views: 76,326
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 9 Hours Ago
Replies: 55,208
Views: 9,438,702
0 What's Wrong With My Bike
Last Post: PoodlePunche
Posted On: 10 Hours Ago
Replies: 83
Views: 4,234
0 Carb upkeep:
Last Post: sportsterpaul
Posted On: 10 Hours Ago
Replies: 2
Views: 232
0 Upside Down Monoshock IH - A Longterm Project
Last Post: paulc
Posted On: 11 Hours Ago
Replies: 384
Views: 87,860
0 oil dripping fom carb
Last Post: Iron Mike
Posted On: 13 Hours Ago
Replies: 5
Views: 327
0 What makes a Hugger a Hugger?
Last Post: Iron Mike
Posted On: 14 Hours Ago
Replies: 25
Views: 2,550
5 Are you married or single???
Last Post: IronHeadRon
Posted On: 14 Hours Ago
Replies: 540
Views: 80,504
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #31  
Old 25th June 2022
Tomcatt Tomcatt is offline
Dazed & Confused
 
Join Date: Feb 2019
Location: Never Never Land
Posts: 3,114
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2017
Other Motorcycle Model: BMW R9T
Other Motorcycle Year: 2015
Reputation: 3795674
Tomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond repute
Default

Quote:
Originally Posted by Racepres View Post
And I thought that simply running on Reserve, deleted al that crap... as a Troubleshooting aid..to eliminate Vacuume problems
Some vacuum petcocks had a "Prime" position (On, Prime, Reserve positions) that flowed fuel with no vacuum when on "Prime", just like a conventional petcock. But, you were still screwed if the diaphragm was damaged.
__________________
2017 XL1200C in SE Wisconsin, USA
Reply With Quote
  #32  
Old 26th June 2022
IXL2Relax's Avatar
IXL2Relax IXL2Relax is offline
XL FORUM TEAM MEMBER
 
Join Date: Feb 2013
Location: Let Freedom Ring in PA
Posts: 9,424
Sportster/Buell Model: Sportster 883►1200
Sportster/Buell Year: 1994
IXL2Relax has disabled reputation
Default

To my knowledge, no HD vacuum petcock ever had a 'prime' setting. Only RES-OFF-ON.

If the carb float bowl is empty, the engine needs to run long enough to create vacuum enough for the petock to open far enough to refill the bowl. If the valve is leaking, it might eventually fill the bowl, but when working as designed, the petcock requires vacuum to let any fuel reach the carb. (Big Mother must protect you from yourself!)


IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For Sportster Tech Info:
Ride The Sportsterpedia - A Toll-Free XLForum Information Highway!
__________________
### The ride is more enjoyable to nowhere in particular! ###

Last edited by IXL2Relax; 26th June 2022 at 14:30..
Reply With Quote
  #33  
Old 26th June 2022
Tomcatt Tomcatt is offline
Dazed & Confused
 
Join Date: Feb 2019
Location: Never Never Land
Posts: 3,114
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2017
Other Motorcycle Model: BMW R9T
Other Motorcycle Year: 2015
Reputation: 3795674
Tomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond repute
Default

Quote:
Originally Posted by IXL2Relax View Post
To my knowledge, no HD vacuum petcock ever had a 'prime' setting. Only RES-OFF-ON.

If the carb float bowl is empty, the engine needs to run long enough to create vacuum enough for the petock to open far enough to refill the bowl.
I couldn't remember if HD ever had the "Prime" petcock. One of the nice things about the "Prime" petcocks was that on prime they'd fill the float bowl of a freshly rebuilt carb. Not a big deal on electric start bikes but it took quite a few kicks to fill the float bowl with a RES-OFF-ON vacuum petcock...

Last edited by Tomcatt; 26th June 2022 at 02:25..
Reply With Quote
  #34  
Old 26th June 2022
brucstoudt's Avatar
brucstoudt brucstoudt is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 15,561
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Sportster/Buell Model #2: 883 C
Sportster/Buell Year #2: '03
Reputation: 1357788
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

will the oem petcock flow fuel through it in the reserve position without the motor running,as mentioned previously?i like to drain the fuel from my tanks at the end of the riding season.haven't been able to do it with the vacuum model.
__________________
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
  #35  
Old 26th June 2022
IXL2Relax's Avatar
IXL2Relax IXL2Relax is offline
XL FORUM TEAM MEMBER
 
Join Date: Feb 2013
Location: Let Freedom Ring in PA
Posts: 9,424
Sportster/Buell Model: Sportster 883►1200
Sportster/Buell Year: 1994
IXL2Relax has disabled reputation
Default

Quote:
Originally Posted by brucstoudt View Post
will the oem petcock flow fuel through it in the reserve position without the motor running,as mentioned previously?i like to drain the fuel from my tanks at the end of the riding season.haven't been able to do it with the vacuum model.
The OEM STOCK PETCOCK does not flow fuel unless the engine is producing vacuum - like turning over or actually running. In the OFF position, it does not flow fuel even when there is vacuum.

The RESERVE position DOES NOT FLOW fuel unless there is vacuum to open the valve in the petcock.

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For Sportster Tech Info:
Ride The Sportsterpedia - A Toll-Free XLForum Information Highway!
Reply With Quote
  #36  
Old 26th June 2022
Iron Mike Iron Mike is offline
Senior Custom Bike Builder
 
Join Date: Dec 2014
Location: Phoenix
Posts: 2,916
Sportster/Buell Model: xlch
Sportster/Buell Year: 1964
Sportster/Buell Model #2: XLCH IR EFI
Sportster/Buell Year #2: 1971
Other Motorcycle Model: BMW K1200RS
Other Motorcycle Year: 2001
Reputation: 2950509
Iron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond repute
Default

Quote:
Originally Posted by brucstoudt View Post
will the oem petcock flow fuel through it in the reserve position without the motor running,as mentioned previously?i like to drain the fuel from my tanks at the end of the riding season.haven't been able to do it with the vacuum model.
Use your vacuum pump to manually open petcock to drain.
Reply With Quote
  #37  
Old 26th June 2022
Racepres Racepres is offline
Master Custom Bike Builder
 
Join Date: May 2013
Location: Middle O the Mitten
Posts: 3,121
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1977
Reputation: 82901
Racepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud ofRacepres has much to be proud of
Default

Quote:
Originally Posted by IXL2Relax View Post
The OEM STOCK PETCOCK does not flow fuel unless the engine is producing vacuum - like turning over or actually running. In the OFF position, it does not flow fuel even when there is vacuum.

The RESERVE position DOES NOT FLOW fuel unless there is vacuum to open the valve in the petcock.

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For Sportster Tech Info:
Ride The Sportsterpedia - A Toll-Free XLForum Information Highway!
Had to go educate myself... The unknown origin 1994 I been riding, will flow on Reserve but not in On, nor Off (of Course).. It does tho, have a chrome Petcock, so that makes me suspicious... So Checking two other (one late one early) '90's XL's , neither will flow anything in any position without vacuum
Apologies for my Ignorance..
Reply With Quote
  #38  
Old 26th June 2022
IXL2Relax's Avatar
IXL2Relax IXL2Relax is offline
XL FORUM TEAM MEMBER
 
Join Date: Feb 2013
Location: Let Freedom Ring in PA
Posts: 9,424
Sportster/Buell Model: Sportster 883►1200
Sportster/Buell Year: 1994
IXL2Relax has disabled reputation
Default

Quote:
Originally Posted by Racepres View Post
Had to go educate myself... Apologies for my Ignorance..
HD made various changes over the years - It's hard to track every one - They even had a bulletin on the fact they reversed the indication of ON & RES. They also some times used the long handle as the indicator and sometimes the other (pointy) end of the switch handle.

http://sportsterpedia.com/doku.php/t...ck_fuel_outlet

The first STOCK use of the vacuum petcock was on 1995 models (previously only an option). So 1994, OEM STOCK, would have had the older, non-vacuum, petcock.

That's one of the reasons for the Sportsterpedia. Even after we figure stuff out, it's hard to remember everything you once learned.

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For Sportster Tech Info:
Ride The Sportsterpedia - A Toll-Free XLForum Information Highway!
Reply With Quote
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



All times are GMT +1. The time now is 04:56.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC