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 Dreaded carb again
Last Post: Iron Mike
Posted On: 5 Minutes Ago
Replies: 19
Views: 463
0 oil pump
Last Post: factory rat
Posted On: 16 Minutes Ago
Replies: 0
Views: 1
0 Please help with muffler identification
Last Post: RKN
Posted On: 34 Minutes Ago
Replies: 2
Views: 112
0 teflon buttons or circlips?
Last Post: kitabel
Posted On: 35 Minutes Ago
Replies: 38
Views: 1,386
0 1985 Ironhead, help with dynatek 2000 install
Last Post: atengnr
Posted On: 41 Minutes Ago
Replies: 3
Views: 70
0 Keep & Kill
Last Post: Graywolf
Posted On: 1 Hour Ago
Replies: 24,094
Views: 1,420,695
0 Where To Get Free Air
Last Post: wedge
Posted On: 1 Hour Ago
Replies: 3
Views: 161
0 This is gonna hurt.
Last Post: wedge
Posted On: 1 Hour Ago
Replies: 8,834
Views: 2,045,670
0 1972 Build thread please subscribe
Last Post: wedge
Posted On: 1 Hour Ago
Replies: 164
Views: 22,066
0 I bought a Sportster last month, but I don't know what to do now, when it leaked the
Last Post: wedge
Posted On: 1 Hour Ago
Replies: 37
Views: 1,884
0 What song do you have stuck in your head?
Last Post: NLXL
Posted On: 1 Hour Ago
Replies: 2,389
Views: 248,379
0 Food porn
Last Post: Graywolf
Posted On: 1 Hour Ago
Replies: 2,454
Views: 559,876
0 Iree's late night cafe
Last Post: ~Grind~
Posted On: 2 Hours Ago
Replies: 2,088
Views: 339,097
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 31,548
Views: 3,619,948
0 Intake Seals
Last Post: Tomcatt
Posted On: 3 Hours Ago
Replies: 3
Views: 63
0 Piston melted
Last Post: RicThompson
Posted On: 3 Hours Ago
Replies: 31
Views: 1,111
0 Bob The Chicken
Last Post: Crusty
Posted On: 4 Hours Ago
Replies: 0
Views: 69
10 Introduction
Last Post: juzyHD
Posted On: 6 Hours Ago
Replies: 7
Views: 88
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 6 Hours Ago
Replies: 51,712
Views: 8,680,727
0 82 XLH in Arkaksas
Last Post: Folkie
Posted On: 6 Hours Ago
Replies: 4
Views: 74
0 Venhill cable
Last Post: 93trident
Posted On: 8 Hours Ago
Replies: 2
Views: 99
0 Help & advice needed
Last Post: Andy Hog
Posted On: 9 Hours Ago
Replies: 21
Views: 718
0 My 99 883 c
Last Post: 99-883-c
Posted On: 9 Hours Ago
Replies: 44
Views: 2,988
0 Electrical problems.
Last Post: Andy Hog
Posted On: 9 Hours Ago
Replies: 9
Views: 262
0 This week on Craig's list
Last Post: Iron Mike
Posted On: 12 Hours Ago
Replies: 5,344
Views: 859,205
0 New to HD
Last Post: Tyler45
Posted On: 13 Hours Ago
Replies: 12
Views: 256
0 Happy Birthday Crusty and Joes95bobber!
Last Post: Crusty
Posted On: 13 Hours Ago
Replies: 12
Views: 310
0 Cam followers have locked up internally. No movement at all. Why?
Last Post: Hippysmack
Posted On: 14 Hours Ago
Replies: 3
Views: 126
0 LED Headlight?
Last Post: ryder rick
Posted On: 15 Hours Ago
Replies: 14
Views: 1,002
0 Anyone know who can shorten fork tubes?
Last Post: Whitewalls
Posted On: 15 Hours Ago
Replies: 3
Views: 144
More...
Members Birthdays
PlanB, Cuco6924 (75), 1200sporty (64), iron68 (50), LifesHarlequin (37), mattosm (36)
Reply
 
Share Thread Tools Display Modes
  #471  
Old 10th February 2014
sifty's Avatar
sifty sifty is offline
Flat Track Champion
 
Join Date: Sep 2012
Location: New Zealand
Posts: 692
Sportster/Buell Model: ironhead XL
Sportster/Buell Year: 1975
Other Motorcycle Model: Triumphs BSA's Hondas
Other Motorcycle Year: '32>
Reputation: 55907
sifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to behold
Default

it's ok, so does everyone else...
Reply With Quote
  #472  
Old 10th February 2014
Moon Wolf's Avatar
Moon Wolf Moon Wolf is offline
Senior Master Custom Bike Builder
 
Join Date: May 2007
Location: Puget Sound--Washington State
Posts: 5,249
Sportster/Buell Model: Sportster XLH
Sportster/Buell Year: 1961
Sportster/Buell Model #2: Sportster XL
Sportster/Buell Year #2: 1957
Other Motorcycle Model: KH KHK XLH XLCH
Reputation: 310625
Moon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond reputeMoon Wolf has a reputation beyond repute
Default

Looks good, sounds good. One small correction on your video captions. That's not a "1970s Big Twin Emblem" on the tank. That's the 63-65 badge, used on both Sporties and big twins.
__________________
If I could only live at the pitch that is near madness

When everything is as it was in my childhood

Violent, vivid, and of infinite possiblilty:

That the sun and moon broke over my head.--Richard Eberhart
Reply With Quote
  #473  
Old 10th February 2014
JackAttack's Avatar
JackAttack JackAttack is offline
Senior Chief Know It All
 
Join Date: Jul 2011
Location: Burlington, KY
Posts: 857
Sportster/Buell Model: 1200 Custom
Sportster/Buell Year: 2006
Reputation: 159355
JackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant futureJackAttack has a brilliant future
Default

Awesome bike, watching that video is really giving me the itch to go ride..
Reply With Quote
  #474  
Old 10th February 2014
sifty's Avatar
sifty sifty is offline
Flat Track Champion
 
Join Date: Sep 2012
Location: New Zealand
Posts: 692
Sportster/Buell Model: ironhead XL
Sportster/Buell Year: 1975
Other Motorcycle Model: Triumphs BSA's Hondas
Other Motorcycle Year: '32>
Reputation: 55907
sifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to behold
Default

Quote:
Originally Posted by Moon Wolf View Post
Looks good, sounds good. One small correction on your video captions. That's not a "1970s Big Twin Emblem" on the tank. That's the 63-65 badge, used on both Sporties and big twins.
You're right, found the part number for those tank badges the other day. I put that vid together in a rush job just before I went on holiday, and took a stab at what I thought they were.
Wrong, of course...
I also thought I had some cool footage at the beach, with swirling sand as a backdrop, but managed to cock up the camera and took stills instead of video...

Now I've had a crack at some editing I may do a proper one when the bike is finished and I have a bit more time...
Reply With Quote
  #475  
Old 17th February 2014
sifty's Avatar
sifty sifty is offline
Flat Track Champion
 
Join Date: Sep 2012
Location: New Zealand
Posts: 692
Sportster/Buell Model: ironhead XL
Sportster/Buell Year: 1975
Other Motorcycle Model: Triumphs BSA's Hondas
Other Motorcycle Year: '32>
Reputation: 55907
sifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to behold
Default

Carb tune, Keihin butterfly

The bike has been running ok, but not great, always starts easy, and chuffs along all right, but has the odd backfire when blipping the throttle, and occasionally cuts out at idle when warm. I know these carbs have a reputation as being a bit erm, sneezy - but I have lots of information (Mitton article, various forum notes and the factory manual) and as I re-kitted it and have a selection of jets available it should be possible to fettle this thing correctly if I follow the advice.

I had put this off as the idle mixture screw head slot was worn out, so it was very difficult to tell both when it was fully seated, and how far out I had screwed it. It was also pretty hard to get to with my tank so low, and as you have to tune these when warm, it meant riding the bike, parking up, removing the tank, and fiddling with a chewed out screw, so I ordered an EZ-just that should let me fine tune it by hand with the tank in place. The arrow in this pic indicates where I have to get a screwdriver in to adjust the idle mixture...



I also wanted to remove the carb to replace the temporary rubber band seals I had made out of radiator hose. These were a quick fix to get mobile, as any parts take a week or so to arrive in NZ (and I had a rally to attend). I expected some degradation as they are not fuel resistant, so was curious to see how they looked, but they appeared to hold up remarkably well, they looked brand new on inspection so I'm wondering how long I could have used them?

This pic of the carb removed shows the chewed out screw head I had trouble adjusting...



The EZ-just looked good, and comparing the packing spring, o-ring etc (in the bag) with the ones I had made it seemed I had made a decent job of it.
I had just filed down a small brass washer and used a spring from a pen...



The only mod I made was to drill a small hole and countersink it in the brass head to have some point of reference as to the position of the screw...



The hardest thing in the whole process was removing the washer and o-ring. I borrowed one of my daughters pipe cleaners and some fine tweezers to root them out, a good clean up and fitting the screw left the carb looking like this...



and when all installed, the thumb screw is easily accessible..



After installation, I had high hopes of simply following the procedure - running up to temp, adjusting the idle mix screw until it was in the correct position, and cracking a beer to celebrate a job well done. It appeared to go ok at the start, the motor fired up instantly but adjusting the idle screw seemed to make no difference to the idle, no matter where I had it, even fully screwed in it didn't seem to have any effect...?

I had some concerns on installing the EZ-just screw as it seemed to only just engage before bottoming out (about 1 1/2 turns on the thread) so I had no confidence that it was actually seating, and this could have been why the head of the original screw was so damaged (it was quite hard getting out)...

I changed the primary jet down a size (to 0.65) but even with the screw fully closed (or what felt like it) there was no difference in the idle. I then wondered if the thread was damaged within the carb body, and if this was why the needle wasn't appearing to seat correctly (I could see this happening if the wrong size screwdriver was used). So I decided to remove the lot and chase a tap through the threads to clean things up. Nothing like time and effort spent for no result...

As the thread on these screws is a metric fine (M6.0 x 0.75) and I had to order a suitable tap in, I'll update how things go once it arrives...
Reply With Quote
  #476  
Old 17th February 2014
IronMick's Avatar
IronMick IronMick is offline
Rider Of The Iron Steed
 
Join Date: Dec 2003
Location: London, ON Canada
Posts: 32,673
Sportster/Buell Model: XLH
Sportster/Buell Year: 1978
Reputation: 1280342
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

If the problem is not the threads ... the usual cause of the idle screw not making a difference is when the pilot jet is too large.
__________________
Mick
IronHead Forever!

Visit Mick's WebSite
[And Check Out My Autobiog]
Reply With Quote
  #477  
Old 17th February 2014
sifty's Avatar
sifty sifty is offline
Flat Track Champion
 
Join Date: Sep 2012
Location: New Zealand
Posts: 692
Sportster/Buell Model: ironhead XL
Sportster/Buell Year: 1975
Other Motorcycle Model: Triumphs BSA's Hondas
Other Motorcycle Year: '32>
Reputation: 55907
sifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to behold
Default

Thought that may be the case Mick, I still have a couple of smaller pilots to drop in, but will try cleaning up the threads first.

I'm just not confident the mixture screw is bottoming out properly, I know you shouldn't force it, but if I turn harder (by hand) it still moves, feels exactly like a tight thread, and I am wary of tightening it further and damaging the seat till I know the threads are ok...
Reply With Quote
  #478  
Old 18th February 2014
IronMick's Avatar
IronMick IronMick is offline
Rider Of The Iron Steed
 
Join Date: Dec 2003
Location: London, ON Canada
Posts: 32,673
Sportster/Buell Model: XLH
Sportster/Buell Year: 1978
Reputation: 1280342
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

With the screw all the way in gently, can you look into the venturi, or feel with your finger, and find the sharp tip of the pilot screw sticking out?

With the pilot screw out, have you cleaned the passage? looked into it with a strong light? Shine a bright light into the venturi can you see it when looking into the pilot screw hole?
Reply With Quote
  #479  
Old 18th February 2014
sifty's Avatar
sifty sifty is offline
Flat Track Champion
 
Join Date: Sep 2012
Location: New Zealand
Posts: 692
Sportster/Buell Model: ironhead XL
Sportster/Buell Year: 1975
Other Motorcycle Model: Triumphs BSA's Hondas
Other Motorcycle Year: '32>
Reputation: 55907
sifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to behold
Default

Great idea, I'll check when I get home, pretty sure the tip wasn't visible when all the way in, but didn't actually check. Will tell me if it's coming up short anyway.

And passage appeared clear, sprayed carb cleaner thru and saw it go into venturi ok.
Cheers...
Reply With Quote
  #480  
Old 18th February 2014
sifty's Avatar
sifty sifty is offline
Flat Track Champion
 
Join Date: Sep 2012
Location: New Zealand
Posts: 692
Sportster/Buell Model: ironhead XL
Sportster/Buell Year: 1975
Other Motorcycle Model: Triumphs BSA's Hondas
Other Motorcycle Year: '32>
Reputation: 55907
sifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to beholdsifty is a splendid one to behold
Default

Found it.

I checked, and there was definitely no sign of the needle entering the venturi when fully screwed in, and it still didn't feel like it was seating, so something was definitely wrong...

I pulled the carb again, removed the screw, spring, washer and o-ring, and the passage was obviously clean, so I tried a 6mm fine thread bolt to see if that would clear the threads. This threaded through fine till it bottomed out, then there was a strange clicking noise if I applied any force. Looking with a directional led torch (and my old-man glasses on ) I could see something in there...? and after much prying (and a little swearing) I popped out a small spring washer that was lodged in the lower portion of the thread. Not sure why that was there, but that would be the source of my problems...

Now with just the screw in place as a trial run, it seats firmly, and you can just feel/see the needle protrude into the carb throat. Hopefully after work tomorrow I'll reassemble everything, and get some response to my tuning efforts...

Moral of the story?
I've learned not to assume, to check before assembly, and to wear glasses for fiddly work...
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 19:54.


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