The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle General Discussion and Problems
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

Active Threads
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: cal43
Posted On: 15 Minutes Ago
Replies: 60,555
Views: 11,011,074
0 Keep & Kill
Last Post: iNSaNeSHaNe
Posted On: 15 Minutes Ago
Replies: 38,245
Views: 2,493,579
0 Trans/Year Interchangeability Question
Last Post: ferretface
Posted On: 2 Hours Ago
Replies: 254
Views: 30,657
0 1970-71 cylinders
Last Post: sungod
Posted On: 2 Hours Ago
Replies: 1
Views: 87
0 Access of the site from Spain
Last Post: npaisnel
Posted On: 2 Hours Ago
Replies: 5
Views: 69
3 Wtb, Wts, Wtt, Wtg (Evos)
Last Post: keithnh
Posted On: 8 Hours Ago
Replies: 7
Views: 95,094
3 Ironhead Pictures Thread
Last Post: Ferrous Head
Posted On: 10 Hours Ago
Replies: 2,059
Views: 942,476
0 Locked up '72
Last Post: Ferrous Head
Posted On: 11 Hours Ago
Replies: 19
Views: 570
0 C.O.B.B. Spring 2024
Last Post: XL Ed
Posted On: 13 Hours Ago
Replies: 24
Views: 1,632
0 How many miles are on your sporty?
Last Post: Nibelungen
Posted On: 13 Hours Ago
Replies: 1,265
Views: 420,074
0 This is gonna hurt.
Last Post: rejeanprimeau
Posted On: 18 Hours Ago
Replies: 10,783
Views: 3,000,767
0 What do you want for Christmas - 2023?
Last Post: sportsterpaul
Posted On: 22 Hours Ago
Replies: 8
Views: 333
0 Ironhead Sprocket Covers
Last Post: Hippysmack
Posted On: 22 Hours Ago
Replies: 36
Views: 1,655
0 Any tricks for ground cable?
Last Post: sportsterpaul
Posted On: 22 Hours Ago
Replies: 22
Views: 1,725
0 Cyber Monday Week Savings - 2 Different Savings Codes!
Last Post: DK Custom
Posted On: 1 Day Ago
Replies: 0
Views: 40
0 Iree's late night cafe
Last Post: Graywolf
Posted On: 1 Day Ago
Replies: 2,842
Views: 720,288
0 video & pics
Last Post: cal43
Posted On: 1 Day Ago
Replies: 3,420
Views: 480,343
0 Clutch Cable
Last Post: sifty
Posted On: 1 Day Ago
Replies: 12
Views: 850
4 excessive oil passing through engine to primary?
Last Post: Ferrous Head
Posted On: 1 Day Ago
Replies: 46
Views: 5,545
0 Torque values
Last Post: brucstoudt
Posted On: 1 Day Ago
Replies: 7
Views: 937
0 15% Off 1275 Packages through 12/4!
Last Post: aswracing
Posted On: 1 Day Ago
Replies: 0
Views: 140
0 Bolt for Mid Control sprocket?
Last Post: Debute23
Posted On: 1 Day Ago
Replies: 16
Views: 1,008
0 No Start conditions
Last Post: IXL2Relax
Posted On: 1 Day Ago
Replies: 11
Views: 965
0 MPG HONESTLY, what do you get?
Last Post: Harley Quinn
Posted On: 1 Day Ago
Replies: 627
Views: 114,257
0 What is the consensus for stator life
Last Post: bustert
Posted On: 2 Days Ago
Replies: 26
Views: 1,735
5 1200 or 883
Last Post: Graywolf
Posted On: 2 Days Ago
Replies: 1,328
Views: 474,552
0 Mystery Cases
Last Post: Ferrous Head
Posted On: 2 Days Ago
Replies: 50
Views: 2,688
0 75 Ironhead cafe racer reboot
Last Post: sportsterpaul
Posted On: 2 Days Ago
Replies: 221
Views: 21,362
0 What's your opinion on windshields?
Last Post: Crom13
Posted On: 2 Days Ago
Replies: 1,291
Views: 284,264
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #1  
Old 24th September 2023
Matteaton Matteaton is offline
Biker
 
Join Date: Sep 2023
Posts: 6
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1973
Reputation: 10
Matteaton is an unknown quantity at this point
Default 73 XLCH help

Hey everyone I’m new to this from and with iron heads, been wanting one for a while so I finally found one in good shape it’s a 1973 XLCH 1000, it’s bored .50 over, top and lower end freshly rebuild, here’s the issue, when I got it home it would start on the first kick but the idle wasn’t consistent, noticed the intake gaskets were wrong they were the tubes and really dry rotted Instead of the O rings that year calls for, so I put the o rings on it has a Keihin butterfly carb that I resealed I left the jets the previous owner had in there, did a push rod adjustment and set the timing probably 10 times by now and i can’t find a good carb setting once it does run and it kickbacks every now and then and the carb sneezes, so I’m wondering since it’s bored out so much should I have to advance the spark timing? Retard the timing, or put original jets in the carb? Is it a float level issue? It is straight piped it allegedly ran great before it sat
Reply With Quote
  #2  
Old 24th September 2023
JB in NC JB in NC is online now
Chief Harley Engineer
 
Join Date: Dec 2022
Location: Piedmont North Carolina
Posts: 545
Sportster/Buell Model: XL 1200
Sportster/Buell Year: 2000
Sportster/Buell Model #2: XL 1200
Sportster/Buell Year #2: 1993
Other Motorcycle Model: H-D FLH
Other Motorcycle Year: 1980
Reputation: 420312
JB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond repute
Default

First, a plus .050 overbore on '73 cylinders is a no-go, as that leaves them too thin. The only exception (I think) is VERY late '73s had the later, heavier cylinders that can safely be bored to plus .070.

With that said, any overbore of this sort does not change displacement enough to affect the state of tune, so don't worry about that.

In general, if it spits back through the carb when the motor is warm, it's too lean. That could be from a vacuum leak, a clogged jet or passage in the carb, or maybe a bad accelerator pump or pump setting.

When tuning, the ignition has got to be spot-on, consistent and correct, so that you remove that from the tuning equation. (After the carb is tuned in the ballpark, small ignition adjustments are of course part of final tuning.) So, good advance unit, well serviced, points clean and adjusted, good condenser, and timing set by the book. Get that right, and then LEAVE IT ALONE while you do the carb tuning.

A Keihin carb is not original to the '73 model year; I think it would have had a Bendix/Zenith from new. Factory butterfly Keihins are notorious for having lean intermediate jetting (the EPA, you know), so a larger intermediate jet will usually cure most of their ills.

Kudos for getting rid of the intake bands. The original o-rings are SO MUCH better. Hope you got good clamps to go with the o-rings.

You will have to be more specific about the whole set-up.

Jim
Reply With Quote
  #3  
Old 25th September 2023
denguy denguy is offline
Senior Chief Know It All
 
Join Date: Nov 2011
Location: The Florida Keys
Posts: 869
Sportster/Buell Model: 1200
Sportster/Buell Year: 1995
Reputation: 394274
denguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond reputedenguy has a reputation beyond repute
Default

Since you said that it sat awhile, a basic place to start would be to give the carb a thorough cleaning, imo.
Reply With Quote
  #4  
Old 26th September 2023
brucstoudt's Avatar
brucstoudt brucstoudt is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 16,430
Sportster/Buell Model: XLCH stroker
Sportster/Buell Year: 1960
Sportster/Buell Model #2: 883 C
Sportster/Buell Year #2: '03
Reputation: 2334880
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

Jim '72-e73 were the cylinders with the thinner liner.most '73 had the thicker liner.the early cylinders had the threads for the head bolts running to the top of the cylinders.the later revised cylinders had the threads ending approx.3/8'' below the head deck surface.
__________________
72 1000cc barrels and XLR heads, S&S 4-1/2'' flywheels, sifton minus-minus cams, S&S super A w/ zippers thunderjet w/yost powertube, Andrews gears,and shafts, 72 oil pump, Morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
Reply With Quote
  #5  
Old 26th September 2023
JB in NC JB in NC is online now
Chief Harley Engineer
 
Join Date: Dec 2022
Location: Piedmont North Carolina
Posts: 545
Sportster/Buell Model: XL 1200
Sportster/Buell Year: 2000
Sportster/Buell Model #2: XL 1200
Sportster/Buell Year #2: 1993
Other Motorcycle Model: H-D FLH
Other Motorcycle Year: 1980
Reputation: 420312
JB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond reputeJB in NC has a reputation beyond repute
Default

Quote:
Originally Posted by brucstoudt View Post
Jim '72-e73 were the cylinders with the thinner liner.most '73 had the thicker liner.the early cylinders had the threads for the head bolts running to the top of the cylinders.the later revised cylinders had the threads ending approx.3/8'' below the head deck surface.
EVERY '73 that I have worked on, so far, have had the early, thin cylinders. I do not believe "most" had the later, thicker cylinders; I have yet to see one. The good news is that the '74 - up top ends are a bolt-on upgrade for the '72 - '73 motors.

Jim
Reply With Quote
  #6  
Old 26th September 2023
1Scooter 1Scooter is offline
Chief Harley Engineer
 
Join Date: Jun 2016
Posts: 513
Sportster/Buell Model: XLH1000
Sportster/Buell Year: 1977
Sportster/Buell Model #2: 2004 XLH1200Custom
Other Motorcycle Model: 2007 FXDB
Other Motorcycle Year: 2004
Reputation: 85935
1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of1Scooter has much to be proud of
Default

Take the overbore out of the equasion, it does not matter. It kicks back - timing is advanced too much. FIRST set the timing, static and dynamic so ys can eliminate one issue. No mention if the ignition is OEM breaker points or aftermarket electronic. The simplist is a Dyna S dual fire ignition that uses OEM advance. Set the timing the 1st time and forget it. Those old carbs ar hard to find good parts for. The simplest carb to replace it with is an S&S Super E. If a decide to go that route, 285/68 jetting will work fo ya.
Reply With Quote
  #7  
Old 27th September 2023
bill smith bill smith is offline
Master Mechanic
 
Join Date: Jun 2012
Posts: 291
Sportster/Buell Model: xlch
Sportster/Buell Year: 1971
bill smith has disabled reputation
Default

You mentioned the sneezin, mine did that and once I rebuilt the flyweights in the ignition advance unit all was good. Pay ya to pull 'em out and service 'em.
Reply With Quote
  #8  
Old 27th September 2023
sungod's Avatar
sungod sungod is offline
XL FORUM TEAM MEMBER
 
Join Date: Feb 2009
Location: ny
Posts: 1,023
Sportster/Buell Model: sportster stroker xlch
Sportster/Buell Year: 1970
Sportster/Buell Model #2: sportster xlh
Sportster/Buell Year #2: 1973
Other Motorcycle Model: 99 inch sportster
Other Motorcycle Year: 2003
Reputation: 1023033
sungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond reputesungod has a reputation beyond repute
Default

Quote:
Originally Posted by bill smith View Post
You mentioned the sneezin, mine did that and once I rebuilt the flyweights in the ignition advance unit all was good. Pay ya to pull 'em out and service 'em.
Bill:
+1
Often overlooked.
TSB 652
MAY 1973
Easy check:
Early 73 = 6 point 9/16
Late 73 = 12 point 7/16
Reply With Quote
  #9  
Old 27th September 2023
brucstoudt's Avatar
brucstoudt brucstoudt is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 16,430
Sportster/Buell Model: XLCH stroker
Sportster/Buell Year: 1960
Sportster/Buell Model #2: 883 C
Sportster/Buell Year #2: '03
Reputation: 2334880
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 TSB 652 info sungod.i have a stack of them,i'll have to look to see if i have that one.
Reply With Quote
  #10  
Old 28th September 2023
brucstoudt's Avatar
brucstoudt brucstoudt is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 16,430
Sportster/Buell Model: XLCH stroker
Sportster/Buell Year: 1960
Sportster/Buell Model #2: 883 C
Sportster/Buell Year #2: '03
Reputation: 2334880
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

my picture from my personal collection
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 16:28.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC