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 Rubbermount shocks on a rigid mount?
Last Post: Folkie
Posted On: 1 Minute Ago
Replies: 7
Views: 63
0 Finding a new doctor...
Last Post: Folkie
Posted On: 13 Minutes Ago
Replies: 13
Views: 132
0 Flat Tire
Last Post: denguy
Posted On: 17 Minutes Ago
Replies: 23
Views: 1,503
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 25 Minutes Ago
Replies: 9,909
Views: 865,471
0 1968 xlch
Last Post: denguy
Posted On: 33 Minutes Ago
Replies: 2
Views: 46
0 Motorcycle Events
Last Post: rhartlin
Posted On: 34 Minutes Ago
Replies: 8
Views: 2,375
0 Bendix / Zenith questions
Last Post: hawgford
Posted On: 34 Minutes Ago
Replies: 41
Views: 19,128
5 What's Your Temp Today
Last Post: Kbetts
Posted On: 44 Minutes Ago
Replies: 29
Views: 1,975
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Graywolf
Posted On: 52 Minutes Ago
Replies: 42,788
Views: 6,681,606
0 C&C Seat Decision
Last Post: 60Gunner
Posted On: 56 Minutes Ago
Replies: 8
Views: 623
0 1200 kit coversion with 50k miles?
Last Post: Blue Scoot
Posted On: 56 Minutes Ago
Replies: 0
Views: 6
0 Frankenstein trike kit on a sportster
Last Post: Toejam503
Posted On: 1 Hour Ago
Replies: 2
Views: 47
0 Stock Straight Rate Fork Spring Weight on Rubbermount 1200C
Last Post: 60Gunner
Posted On: 1 Hour Ago
Replies: 2
Views: 38
0 Arbor press for crankshaft
Last Post: bustert
Posted On: 1 Hour Ago
Replies: 13
Views: 201
0 So heres the plan
Last Post: Bryan1976
Posted On: 1 Hour Ago
Replies: 24
Views: 3,545
0 compression problems
Last Post: bustert
Posted On: 1 Hour Ago
Replies: 26
Views: 454
0 forward controls vs. "normal" / trades?
Last Post: oupa
Posted On: 1 Hour Ago
Replies: 1
Views: 34
0 Dyno Run, V&H straight shots vs. Screamin' Eagles
Last Post: 60Gunner
Posted On: 1 Hour Ago
Replies: 51
Views: 34,734
0 This week on Craig's list
Last Post: Tim The Grim
Posted On: 1 Hour Ago
Replies: 3,750
Views: 414,984
0 Forum problems???
Last Post: bplinson
Posted On: 1 Hour Ago
Replies: 33
Views: 915
0 Crusty's Travels
Last Post: moparnut72
Posted On: 1 Hour Ago
Replies: 1,964
Views: 228,842
0 I think I may be a gas tank hoarder...
Last Post: Ferrous Head
Posted On: 2 Hours Ago
Replies: 13
Views: 374
0 KT - 2019 - Done Riding - Not Hardly
Last Post: Hippysmack
Posted On: 2 Hours Ago
Replies: 11
Views: 2,719
10 What's your Personal Tech
Last Post: Toejam503
Posted On: 2 Hours Ago
Replies: 34
Views: 909
0 ultima iggy,, static time vs dynamic time
Last Post: brucstoudt
Posted On: 2 Hours Ago
Replies: 34
Views: 1,461
0 Seized Oil Pump
Last Post: Hippysmack
Posted On: 3 Hours Ago
Replies: 17
Views: 381
0 Hello from Seattle
Last Post: racemoto
Posted On: 3 Hours Ago
Replies: 12
Views: 213
0 my build in my apartment
Last Post: Toejam503
Posted On: 3 Hours Ago
Replies: 3
Views: 138
0 Rocker Lockers - Quiet Down Annoying Top End Ticking
Last Post: DK Custom
Posted On: 3 Hours Ago
Replies: 61
Views: 14,538
0 what brand of spark plug do you use?
Last Post: Toejam503
Posted On: 3 Hours Ago
Replies: 305
Views: 70,166
More...
Members Birthdays
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #1  
Old 8th April 2007
joestuff's Avatar
joestuff joestuff is offline
Senior Chief Know It All 1st Class
 
Join Date: Dec 2006
Posts: 1,156
Sportster/Buell Model: XLCH, restored
Sportster/Buell Year: 1962
Sportster/Buell Model #2: XLH, period hotrod basket
Sportster/Buell Year #2: 1961
Other Motorcycle Model: FXDXT (T-sport)
Other Motorcycle Year: 2002
Reputation: 2223
joestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the rough
Question Stupid points and timing questions.

I guess being a young guy who has only worked on electronic ignitions in the past, my points theory may be off a bit…I have read most of the posts about timing, but I have a few questions to help me understand what is going on a little better.

My bike is a 62 XLCH with a static timing magneto. It has a mark on the magneto and one on the case. The flywheel has two marks, one line and one circle.

The circle is TDC for the front, is the line TDC for the rear, or is the line the advance mark for the front?

It fires when the points are closed or open?

My points should be open of closed when the line is in the center of the timing hole?

45 advanced is the static setting?

15 advanced is the amount of retard provided by the magneto control arm on later bikes?

Rotating the magneto counter clock wise retards the timing, right?

Also, I read on this group about when the cylinders fire and to find the compression stroke before giving a good kick. Confirm for me that this is when you feel compression at the top of the kicker swing, and that it comes around 1 out of every four kicks?

Thanks for you help
Joe
Reply With Quote
  #2  
Old 8th April 2007
thefrenchowl's Avatar
thefrenchowl thefrenchowl is online now
Senior Custom Bike Builder
 
Join Date: Nov 2006
Posts: 2,812
Sportster/Buell Model: KHK
Sportster/Buell Year: 1954
Sportster/Buell Model #2: IronHead XLH
Sportster/Buell Year #2: 1978
Other Motorcycle Model: XLRTT
Other Motorcycle Year: 1966
Reputation: 158473
thefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant futurethefrenchowl has a brilliant future
Default

Hi joestuff,

Gawd, you're not asking much, do you?

""The circle is TDC for the front, is the line TDC for the rear""

Yes, and because the Sportster is a 45 deg Vtwin, the vertical line is BOTH TDC for the rear pot AND 45 deg advance mark for the front pot...

The mag fires when the points just open. However, because it's a mag, it needs a bit of motion previous to the points opening to create the reversal of the magnetic field. Hence, when you kick a no retard mag, from rest, it'll stop on compression, but sometimes too far for the mag to create a spark on your 1st kick.

So... Kick it so it will stop on compression, then bring the kicker down about 1/2 way, go up again and then only kick it to death, you should now get a proper spark everytime. I.E, don't kick hard on the compression, you're wasting your time... and you'll certainly get Sportster Knee Syndrome...

To time the mag: bike on blocks to lift rear wheel, in 4th gear, spark plugs out so it's easy to turn the rear wheel... Set your points first for maximum 15 thou. Small cam is front cyl, wide cam is back cyl.

Full advance, rotate the rear wheel forward to bring the vertical line in the center of the window on the front cyl. comp. stroke which is the one when both your front cyl. push rods are free to rotate, unscrew slightly the 2 mag holding bolts, insert ciggie paper in between the points, rotate clockwise until the paper just gets free with the slightest upward pull. Tighten the mag down again. The factory guys weren't daft: when set up proper, the mag should be facing backwards and in line with the bike if you have the original alloy mag adaptor plate, that's why you should also have a kinked rear rocker box oiler pipe to clear the kill switch wire...

To check: refit paper, rotate wheel to the next front comp. stroke, stop dead when paper's free, go on the other side and see where the line is. Readjust slightly if needed.

Now start the bugger and enjoy it!!!

Patrick
__________________
Flat Head Forever

Last edited by thefrenchowl; 8th April 2007 at 23:10..
Reply With Quote
  #3  
Old 9th April 2007
joestuff's Avatar
joestuff joestuff is offline
Senior Chief Know It All 1st Class
 
Join Date: Dec 2006
Posts: 1,156
Sportster/Buell Model: XLCH, restored
Sportster/Buell Year: 1962
Sportster/Buell Model #2: XLH, period hotrod basket
Sportster/Buell Year #2: 1961
Other Motorcycle Model: FXDXT (T-sport)
Other Motorcycle Year: 2002
Reputation: 2223
joestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the roughjoestuff is a jewel in the rough
Default

Quote:
Originally Posted by thefrenchowl View Post
Hi joestuff,

Gawd, you're not asking much, do you?

Patrick
Thanks Patrick, that is a perfect answer. You saved me knee, so I owe you one.
Reply With Quote
  #4  
Old 9th April 2007
ironhead red's Avatar
ironhead red ironhead red is offline
Flat Track Champion
 
Join Date: Jan 2007
Posts: 600
Sportster/Buell Model: XLCH Stroker Chop
Sportster/Buell Year: 1974
Sportster/Buell Model #2: XLH Bobber
Sportster/Buell Year #2: 1977
Other Motorcycle Model: XLH Project ?????
Other Motorcycle Year: 1980
ironhead red has disabled reputation
Default

I've always wanted to touch on the proper way to kick an Ironhead, but didn't want get into it (opinions will vary). Frenchowl, it sounds like you have kicked a few high compression Irons in your day as well. I let people try to kick my stroker for fun... It's always a riot, I just sit back , grab a beer and watch the show !

Red
Reply With Quote
  #5  
Old 24th September 2018
achris03 achris03 is offline
Biker
 
Join Date: Aug 2017
Location: East Texas
Posts: 6
Sportster/Buell Model: Sportster XLCH
Sportster/Buell Year: 1966
Reputation: 10
achris03 is an unknown quantity at this point
Default Super Duper Thread Resurrection

Quote:
Originally Posted by thefrenchowl View Post
Hi joestuff,

The mag fires when the points just open. However, because it's a mag, it needs a bit of motion previous to the points opening to create the reversal of the magnetic field. Hence, when you kick a no retard mag, from rest, it'll stop on compression, but sometimes too far for the mag to create a spark on your 1st kick.

So... Kick it so it will stop on compression, then bring the kicker down about 1/2 way, go up again and then only kick it to death, you should now get a proper spark everytime. I.E, don't kick hard on the compression, you're wasting your time... and you'll certainly get Sportster Knee Syndrome...


Patrick
I know this thread is super old but I just happened across it just poking around. Being that I have never owned a kicker before the Sportster I have now especially a mag ignition, this little gem was an awesome find! Really helped my bike start much easier!
Reply With Quote
  #6  
Old 24th September 2018
brucstoudt's Avatar
brucstoudt brucstoudt is offline
Senior Master Custom Bike Builder
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 12,905
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Reputation: 227985
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

i noticed an error in the first post turning the magneto clockwise retards the spark,not counter clockwise.
__________________
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
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 01:18.


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