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

Notices

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

Active Threads
0 Keep & Kill
Last Post: Crusty
Posted On: 3 Minutes Ago
Replies: 25,525
Views: 1,492,654
0 90" of Street-based FUN coming downunder
Last Post: BKB
Posted On: 23 Minutes Ago
Replies: 348
Views: 69,499
0 Had to wait for the snow to fall to pick up my 73
Last Post: T4halo
Posted On: 1 Hour Ago
Replies: 3
Views: 71
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Graywolf
Posted On: 2 Hours Ago
Replies: 52,480
Views: 8,856,606
0 never mind
Last Post: Hippysmack
Posted On: 2 Hours Ago
Replies: 302
Views: 57,541
0 Selling my '95 883 H in Phoenix AZ - $1,750 XLF pricing before it goes on CL
Last Post: Brad
Posted On: 3 Hours Ago
Replies: 0
Views: 54
0 Sportster Builds
Last Post: sportsterpaul
Posted On: 5 Hours Ago
Replies: 3
Views: 81
0 Video - What Comparison Dyno Charts Would YOU Like to See?
Last Post: DK Custom
Posted On: 5 Hours Ago
Replies: 0
Views: 24
0 Snippets
Last Post: sportsterpaul
Posted On: 6 Hours Ago
Replies: 520
Views: 72,815
0 This is gonna hurt.
Last Post: Graywolf
Posted On: 8 Hours Ago
Replies: 9,081
Views: 2,124,650
0 Food porn
Last Post: Stairman
Posted On: 8 Hours Ago
Replies: 2,557
Views: 608,665
0 Roads I'd like to ride.
Last Post: Stairman
Posted On: 9 Hours Ago
Replies: 3,713
Views: 430,745
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 9 Hours Ago
Replies: 33,019
Views: 3,889,858
0 Ironhead engine problem?
Last Post: Congojack
Posted On: 11 Hours Ago
Replies: 37
Views: 1,694
0 Hot Chicks on Hot Bikes
Last Post: Stairman
Posted On: 11 Hours Ago
Replies: 12,609
Views: 2,984,052
0 04 Sportster refurb and build.
Last Post: JimVonBaden
Posted On: 12 Hours Ago
Replies: 32
Views: 2,031
0 Video - Why Tire PSI Should Be Checked Often!
Last Post: DK Custom
Posted On: 13 Hours Ago
Replies: 2
Views: 170
3 Wtb, Wts, Wtt, Wtg (Ironhead)
Last Post: CrustyTubs
Posted On: 13 Hours Ago
Replies: 10
Views: 288,071
0 Tachometer Suggestions
Last Post: BigMek
Posted On: 13 Hours Ago
Replies: 1
Views: 81
0 The Strociek Project
Last Post: Ferrous Head
Posted On: 14 Hours Ago
Replies: 63
Views: 4,484
0 1983 Roadster
Last Post: rejeanprimeau
Posted On: 14 Hours Ago
Replies: 77
Views: 5,158
10 1983 XR 1000 Starting Issues.
Last Post: CT XR rider
Posted On: 15 Hours Ago
Replies: 8
Views: 333
0 video & pics
Last Post: cal43
Posted On: 18 Hours Ago
Replies: 571
Views: 59,891
0 Hot Rods, Rat Rods, and Customs.
Last Post: cal43
Posted On: 19 Hours Ago
Replies: 4,814
Views: 958,886
0 72 ih stroker advise needed
Last Post: rocketnorton
Posted On: 1 Day Ago
Replies: 15
Views: 808
0 Clutch squeal ? Bad throwout bearing ?
Last Post: Tomcatt
Posted On: 1 Day Ago
Replies: 95
Views: 20,747
0 Acceptable Voltage Drop-Starter Circuit
Last Post: ZTatZAU
Posted On: 1 Day Ago
Replies: 58
Views: 2,141
0 1968 ex barn dweller thread
Last Post: GA_Ironhead
Posted On: 1 Day Ago
Replies: 205
Views: 21,148
0 Starter gaskets 74 XLH1000
Last Post: Chuckthebeatertruck
Posted On: 1 Day Ago
Replies: 5
Views: 198
0 Starting?
Last Post: Briank
Posted On: 1 Day Ago
Replies: 4
Views: 213
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #11  
Old 4 Weeks Ago
ZTatZAU ZTatZAU is offline
Greasemonkey
 
Join Date: Aug 2021
Posts: 106
Sportster/Buell Model: XLH1000
Sportster/Buell Year: 1973
Other Motorcycle Model: '89 GL1500 & '71 CB750
Other Motorcycle Year: ^^^^
Reputation: 78617
ZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud ofZTatZAU has much to be proud of
Default

Quote:
Originally Posted by alsfarms View Post
I am new here and am getting back on my Sporty after a decade long hibernation. I see lots of chat regarding the newer Sportsters but not so much regarding the 70's stuff. Are any mechanical upgrades available or do we simply now stay close to stock with the older bikes?
Al
Hey Al,
I'm pretty new here myself and just finishing up the resurrection of my 73 XLH after a twelve year hiatus. I've learned a lot from all the resources here as well as from the Iron Headers who I suspect are mostly all old farts like me but happy to answer questions and share their knowledge.

BTW! Do not remove your crankcase drain plug! Ever!
I removed and reinstalled mine before reading about the perils in doing so. Mine seemed to come out and go back in OK but the prevailing opinion seems to be... Don't mess with it! I'm still "bettin' on the come" that mine won't leak but I should know soon. I'm getting close to firing it up.

Good luck with your 75! ZT
Reply With Quote
  #12  
Old 4 Weeks Ago
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 10,674
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 3365312
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

when the valves stay open longer and over-lap is increased, it effects the compression dynamically. lower compression = lost power so the need to raise static ratio.
i run 10:1 in the iron
my 01 sport runs andrews n4 with about 5* retard to push the power band up scale around 500 rpm as i built it for top end and run int'l gearing.
the thing about it is that because dynamic compression is low, i run regular 87 fuel.
Reply With Quote
  #13  
Old 4 Weeks Ago
Racepres's Avatar
Racepres Racepres is offline
Master Custom Bike Builder
 
Join Date: May 2013
Location: Middle O the Mitten
Posts: 3,048
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1977
Reputation: 56966
Racepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to beholdRacepres is a splendid one to behold
Default

Quote:
Originally Posted by doodah man View Post
My favorite mod on my ‘75 was changing it to right side shift. That and an all andrews transmission.
Oddly, There is a '75 here..all original... Shifts better than any Rhube Goldburgh
setup than I have ever witnessed!!
Why it is still Original.. Except Mufflers, it now even wears a Stock Seat, and Front Fender!!!
Reply With Quote
  #14  
Old 3 Weeks Ago
alsfarms alsfarms is offline
Biker
 
Join Date: Oct 2021
Posts: 6
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1975
Reputation: 10
alsfarms is an unknown quantity at this point
Default

Hello, I have read back through the posts that relate to my topic of a 1975 Sporty. I am not real familiar with some of the terms I read about. I would like a bit more information on these terms: dual plugs, 4-1/2 flywheels, single fire ignition. What is the way to get this 1000 cc Sporty close to 1200 cc? Who is the best source for aftermarket Iron head speed parts?
Al
Reply With Quote
  #15  
Old 3 Weeks Ago
alsfarms alsfarms is offline
Biker
 
Join Date: Oct 2021
Posts: 6
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1975
Reputation: 10
alsfarms is an unknown quantity at this point
Default

Hello ZT..... You and I are in similar circumstances. What is the "Paul Harvey Rest of the Story" behind your comment about never taking out the crankcase drain plug? Shed more light please then I will offer a bit more information from my end.
Al

Last edited by alsfarms; 3 Weeks Ago at 22:10.. Reason: spelling
Reply With Quote
  #16  
Old 3 Weeks Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
Blind Owl
 
Join Date: Jun 2009
Location: Sunshine Coast
Posts: 7,359
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: 2796108
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

The drain plugs are steel and the cases aluminum. Dissimilar metals and they will "weld" themselves together over time. You run the risk of destroying the threads in the case when you remove them. There is no real reason to remove them.

Al, you need to think carefully about modifying a 75. The bike is now 45 years old and if it's bone stock may be more valuable over time as it is.

Single fire versus dual fire:

Sportsters use a "wasted spark" strategy to fire the plugs. Both plugs fire simultaneously. This works (mostly) as one cylinder will be at the correct firing point (40 btdc on compression) and the other will be on an exhaust cyle, intake just starting.

Single fire delivers just one spark to each cylinder when it's required.

Dual plugs. Just as it sounds, Adding a second plug to the right side of the heads. It also requires a new ignition system (twin tower coils etc).
Every bit helps but this isn't required on a street engine. Overkill. On a flat out race engine, yes.

4 1/2 inch wheels. Stroker wheels to increase stroke and capacity."
This is major surgery and does make for a more interesting engine. It has become a lot harder to do this lately as S&S have stopped making the rotating assemblies. You need a good machinist to help you down this road.

At the end of the day you need to consider what you want the bike to do.

Are you going to race it ?

Against what ?

As an everyday rider HD got things pretty much right.

Some aren't enamored of the big gap between 3rd and 4th but around the city in traffic they are great. Some don't like points/mechanical advance but it's worked fine for a hundred years so far.
__________________
"I know only too well the evil that I propose. But my inclinations get the better of me."
Reply With Quote
  #17  
Old 3 Weeks Ago
IronMick's Avatar
IronMick IronMick is offline
Rider Of The Iron Steed
 
Join Date: Dec 2003
Location: London, ON Canada
Posts: 32,715
Sportster/Buell Model: XLH
Sportster/Buell Year: 1978
Reputation: 1280347
IronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond repute
Default

Regarding getting to 1200 cc - note that you can overbore these engines only to repair damaged cylinders, and you can do this only a limited number of times [usually about 7]. The only practical way to increase CCs is with stroking. There are some recent threads on this topic.
__________________
Mick
IronHead Forever!

Visit Mick's WebSite
[And Check Out My Autobiog]
Reply With Quote
  #18  
Old 3 Weeks Ago
RicThompson RicThompson is offline
Senior Chief Master Mechanic
 
Join Date: Sep 2019
Posts: 946
Sportster/Buell Model: XLH
Sportster/Buell Year: 1969
Other Motorcycle Model: 111 Ironhorse Outlaw
Other Motorcycle Year: 2004
Reputation: 640139
RicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond reputeRicThompson has a reputation beyond repute
Default

T&O flywheels are readily available any stroke you want. Aftermarket cylinders are available. Big bore cylinders are available. Hot rod IH's are fun. You can bracket race anything you want. At the end of the day it's all about having fun. If you want to go fast how much $$$ do you want to spend. If it's your daily ride keep it simple.
Reply With Quote
  #19  
Old 3 Weeks Ago
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 10,674
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 3365312
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

shovelster was popular back in the day.
but i would rather just have the shovel, wish i never got rid of my 74 superglide. even a stock one with proper tranny ratios would surprise many, i smoked a 900rms beemer with ease back in the 70's.
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 05:09.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC