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 WTB Rubbermount Air Shifter,Wheelie Bars
Last Post: Sprtstr1200s
Posted On: 14 Minutes Ago
Replies: 8
Views: 117
0 ***DK Custom-Limited Time 10% Savings On M8 Softail Floorboard Extensions***
Last Post: DK Custom
Posted On: 15 Minutes Ago
Replies: 0
Views: 2
0 ***DK Custom-Limited Time 10% Savings on ALL Thunder Torque Inserts***
Last Post: DK Custom
Posted On: 30 Minutes Ago
Replies: 0
Views: 4
0 Turn Brake Stop for 97?
Last Post: mikeLI_77
Posted On: 43 Minutes Ago
Replies: 6
Views: 79
0 Who's still riding???
Last Post: ss396
Posted On: 45 Minutes Ago
Replies: 50
Views: 2,321
0 question on engine temp in winter
Last Post: Nibelungen
Posted On: 49 Minutes Ago
Replies: 14
Views: 164
0 ***DK Custom-Limited Time 10% Savings on ALL Headlight Relo Kits***
Last Post: DK Custom
Posted On: 53 Minutes Ago
Replies: 0
Views: 12
0 ***DK Custom-Announcing The 5th Annual Internet Bike Contest***
Last Post: DK Custom
Posted On: 1 Hour Ago
Replies: 11
Views: 522
0 1200s mid throttle stumble
Last Post: NZstu
Posted On: 2 Hours Ago
Replies: 45
Views: 990
0 Which forum for a Dyna Low Rider?
Last Post: Nibelungen
Posted On: 2 Hours Ago
Replies: 5
Views: 90
0 '04 XL1200 Suddenly gotten louder and running slightly rough
Last Post: crazyhorse53
Posted On: 2 Hours Ago
Replies: 18
Views: 907
0 77 windshield on 82?
Last Post: bremoit
Posted On: 2 Hours Ago
Replies: 0
Views: 41
0 Roads I'd like to ride.
Last Post: Medicalweed
Posted On: 2 Hours Ago
Replies: 702
Views: 42,458
0 My 1200 IRON
Last Post: Nibelungen
Posted On: 2 Hours Ago
Replies: 26
Views: 1,626
0 Cam timing and piston position
Last Post: doodah man
Posted On: 3 Hours Ago
Replies: 33
Views: 745
0 What did you do for your sporty Today?
Last Post: ParrotHead
Posted On: 3 Hours Ago
Replies: 5,522
Views: 638,824
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 42,051
Views: 6,511,543
0 Food porn
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 933
Views: 130,935
0 Vibration During Acceleration
Last Post: Skuzeee
Posted On: 3 Hours Ago
Replies: 18
Views: 403
0 Air quality went down the tubes
Last Post: Nibelungen
Posted On: 3 Hours Ago
Replies: 11
Views: 256
0 How stock is your bike
Last Post: Beelzeboss
Posted On: 3 Hours Ago
Replies: 142
Views: 28,955
0 04 XL1200 Burning Oil (possibly)
Last Post: rocketmangb
Posted On: 4 Hours Ago
Replies: 1
Views: 47
0 ***DK Custom-Limited Time 10% Savings Code on ALL DK Custom Parts***
Last Post: DK Custom
Posted On: 4 Hours Ago
Replies: 2
Views: 152
0 T-Bar Question
Last Post: DFuller1980
Posted On: 4 Hours Ago
Replies: 0
Views: 34
3 Thoughts on buying
Last Post: Medicalweed
Posted On: 4 Hours Ago
Replies: 7
Views: 258
0 WTF Happened
Last Post: Flame__
Posted On: 5 Hours Ago
Replies: 947
Views: 160,607
0 How to keep a dry clutch dry?
Last Post: 8ball
Posted On: 6 Hours Ago
Replies: 89
Views: 13,294
0 Relatively Interesting Road Sign
Last Post: BKB
Posted On: 6 Hours Ago
Replies: 39
Views: 1,114
0 Cast or forged
Last Post: spacecoast
Posted On: 6 Hours Ago
Replies: 6
Views: 150
More...
Members Birthdays
gp9739 (74), danbango (71), andyman1958 (60), 55 Jr (57), Love2FixIt (49), keywan (47), C Dubya (44), CA71xlch (43)
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #21  
Old 4 Weeks Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
XL FORUM TEAM MEMBER
 
Join Date: Jun 2009
Location: Sunshine Coast
Posts: 4,095
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: 350688
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

On my bike a mag is essential. But that's because I run alcohol and very high compression. I do run the Morris gen mount version and it's been great.
But before you start considering buying anything you need to be honest with what you aim to achieve.

I too have the choice to run in an early or late class. In the early class only the 900 style engines are allowed.
My engine is super competitive in that class. I'm up against Vincents, Nortons, Triumphs and BSA's. They just can't come close to the torque I can make.
In the later class I can run a 1000 engine but it's a big ask. The competition is much higher. Speeds are higher which puts strains on everything else. Suspension, brakes and the frame all now come into play in a big way.

If you are seriously going to spin an Ironhead engine you need to invest in a better rotating assembly. Cast iron flywheels don't cut it when you do start making power.

THE smart way to do the bottom end id with an S&S assembly. They will come balanced for your pistons and ready to run. Seriously for a race engine that one is a no brainer.

If your class limit is higher than 1000 cc's then stroke it at the same time. Follow Smokey Yunicks advice and build the biggest engine you can for the class. It is the CHEAPEST way to get torque.

you will win far more trophies by finishing races than having more HP than anybody else. Build a reliable, solid runner with proven parts There are enough guri's around here to help you with all of that.

be honest about you budget. A LOT of guys want to go racing on a shoestring. There is so much more to racing in terms of cost than just rebuilding a cheap bike and throwing in a few "hot" parts. Things like trailers, fuel, entry fees, tires, accommodation, helmets, leathers etc etc etc all add up to b more important (generally) than the cost of the bike.

If you have never raced before, grab a stock bike and go out and have a run. That will tell you a LOT about what is required and if you really want to go down this path.

Having said all of that you'll never know unless you try. It's like trying to explain an orgasm to a 21 year old virgin. No words suffice.
__________________
"I know only too well the evil that I propose. But my inclinations get the better of me."
Reply With Quote
  #22  
Old 4 Weeks Ago
Scott Scott is offline
Biker
 
Join Date: Oct 2018
Posts: 22
Sportster/Buell Model: XL racebike in progress
Sportster/Buell Year: 1981
Other Motorcycle Model: Moto Guzzi V11 Lemans
Other Motorcycle Year: 2002
Reputation: 10
Scott is an unknown quantity at this point
Default

I truly understand the financial horrors of racing. I campaigned an XS650 sidecar many years ago and will be selling my Harley 45 racebike to finance this Sportster. Hadn't planned on replacing the crank assembly, but now you've got me thinking. I'm using the 1979 and later frame and plan to transplant a dual disc XS650 front end. I'll just relace the rear bub to an 18" rim. My current vintage racebike is a 250 cc Can Am dirtbike turned roadracer. It's faster than me. I'm slow, but I like to finish races. There are always people far more skilled then me on the track. This is embarrassing, but one of the magneto's biggest draws (run on on my 45) is that I always forget to charge the battery in a total loss system. I've learned that e-ignitions don't appreciate being asked to run on low voltage. Points don't seem to care. Maybe a voltmeter next to the tach will help? Anyway, here's photo of my non-Sportster racebike that is frustrating me, which is why I'll be selling it.

Reply With Quote
  #23  
Old 4 Weeks Ago
Scott Scott is offline
Biker
 
Join Date: Oct 2018
Posts: 22
Sportster/Buell Model: XL racebike in progress
Sportster/Buell Year: 1981
Other Motorcycle Model: Moto Guzzi V11 Lemans
Other Motorcycle Year: 2002
Reputation: 10
Scott is an unknown quantity at this point
Default

P.S. I'm limited to stock bore and stroke. The class limit is 850 cc but there is an exception for Sportsters.
Reply With Quote
  #24  
Old 4 Weeks Ago
Martysf's Avatar
Martysf Martysf is offline
Master Mechanic
 
Join Date: Apr 2016
Location: San Francisco CA
Posts: 270
Sportster/Buell Model: Ironhead
Sportster/Buell Year: 1983
Reputation: 26426
Martysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to allMartysf is a name known to all
Default Another ironhead roadracer

Man is that beautiful!!


Sent from my iPad using Tapatalk
Reply With Quote
  #25  
Old 4 Weeks Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
XL FORUM TEAM MEMBER
 
Join Date: Jun 2009
Location: Sunshine Coast
Posts: 4,095
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: 350688
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

OK - in that case the later 1000cc bike will be the ticket.
I would still use stock stroke S&S rotating assembly. Build the engine for torque, not HP. The races you run in won't be long ones so heat won't be as much as a problem. Highest compression you can get with the available fuel.
Reply With Quote
  #26  
Old 4 Weeks Ago
Scott Scott is offline
Biker
 
Join Date: Oct 2018
Posts: 22
Sportster/Buell Model: XL racebike in progress
Sportster/Buell Year: 1981
Other Motorcycle Model: Moto Guzzi V11 Lemans
Other Motorcycle Year: 2002
Reputation: 10
Scott is an unknown quantity at this point
Default

The S&S non stroker flywheel assembly is special order only. I’ll have plenty of questions when it comes to buy cams. Can anyone suggest a huge oil cooler, not one especially intended for a bike (like a transmission cooler) that they’ve personally used? Thinking about finding higher compression cylinders or skimming the heads. Would appreciate any input on which is better. Also a goidplace to work on the heads.
Reply With Quote
  #27  
Old 4 Weeks Ago
brucstoudt's Avatar
brucstoudt brucstoudt is offline
Senior Master Custom Bike Builder
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 12,771
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Reputation: 170513
brucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant futurebrucstoudt has a brilliant future
Default

Quote:
Originally Posted by Scott View Post
Also a goidplace to work on the heads.
that would be mrmom9r.he had several posts on pg.2.send him a p.m.here.he could also answer your question before this one.
__________________
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
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 22:10.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC