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 Keep & Kill
Last Post: Graywolf
Posted On: 21 Minutes Ago
Replies: 21,387
Views: 1,264,432
0 Backfiring
Last Post: IXL2Relax
Posted On: 30 Minutes Ago
Replies: 33
Views: 1,775
0 Do you blow dry your ride after wash
Last Post: Hippysmack
Posted On: 51 Minutes Ago
Replies: 176
Views: 20,524
0 Hammer 1275 clang noise, slow oil feed, kinked crankcase vent.
Last Post: Hippysmack
Posted On: 53 Minutes Ago
Replies: 444
Views: 14,640
0 Corona Virus
Last Post: madnss
Posted On: 55 Minutes Ago
Replies: 1,626
Views: 159,155
0 final drive front sprocket change
Last Post: kitabel
Posted On: 1 Hour Ago
Replies: 6
Views: 436
0 2018 Iron 1275 Project
Last Post: yelladox
Posted On: 1 Hour Ago
Replies: 30
Views: 3,410
0 Do you blip the throttle when downshifting?
Last Post: Ireeman
Posted On: 2 Hours Ago
Replies: 477
Views: 91,016
0 What Is the Advantage - Shovster?
Last Post: Chuckthebeatertruck
Posted On: 2 Hours Ago
Replies: 85
Views: 5,847
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 50,346
Views: 8,266,054
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 28,393
Views: 3,020,640
0 This is gonna hurt.
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 8,440
Views: 1,870,739
0 Non-Starter, Compression Test Results
Last Post: GA_Ironhead
Posted On: 3 Hours Ago
Replies: 22
Views: 872
0 Iron 1966 XLRTT
Last Post: brucstoudt
Posted On: 4 Hours Ago
Replies: 186
Views: 42,342
0 Magneto Sportster's 1964 XLH Restoration Project
Last Post: brucstoudt
Posted On: 4 Hours Ago
Replies: 53
Views: 7,191
0 Ford CEO Jim Farley nominated to Harley-Davidson board of directors
Last Post: Maxeffort
Posted On: 5 Hours Ago
Replies: 12
Views: 617
0 Swing arm bearing change
Last Post: SportsterXLCH1967
Posted On: 6 Hours Ago
Replies: 7
Views: 329
0 Peanut, 3.3 or 4.5 gas tank ?
Last Post: IXL2Relax
Posted On: 6 Hours Ago
Replies: 261
Views: 79,412
0 xl1200T
Last Post: luce26
Posted On: 7 Hours Ago
Replies: 0
Views: 37
0 What did you do to your EFI Sporty today?
Last Post: Maxwell#256
Posted On: 7 Hours Ago
Replies: 4,006
Views: 827,517
0 New here - compression test produced meh results.
Last Post: rocketnorton
Posted On: 7 Hours Ago
Replies: 27
Views: 1,459
0 What to do now? Ironhead clutch hub nut stripped
Last Post: Steve9
Posted On: 8 Hours Ago
Replies: 8
Views: 334
0 S&S Super E
Last Post: Serious Blac
Posted On: 9 Hours Ago
Replies: 15
Views: 793
0 Iron 2020 wire tuck
Last Post: Dorretje
Posted On: 10 Hours Ago
Replies: 0
Views: 44
0 Exhaust paint, coatings for head pipes?
Last Post: SLW210
Posted On: 10 Hours Ago
Replies: 5
Views: 178
0 1970 XLH Tach cable kinked
Last Post: sungod
Posted On: 11 Hours Ago
Replies: 20
Views: 843
0 Swingarm Fitment
Last Post: SLW210
Posted On: 11 Hours Ago
Replies: 1
Views: 168
0 1970 XLH smoke from rocker box gasket
Last Post: sungod
Posted On: 11 Hours Ago
Replies: 11
Views: 427
0 WTB 04-06 intake manifold
Last Post: aswracing
Posted On: 12 Hours Ago
Replies: 3
Views: 171
0 Steering Neck Tapered Bearin Kit
Last Post: SportsterXLCH1967
Posted On: 12 Hours Ago
Replies: 1
Views: 143
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #31  
Old 3rd March 2021
Bert fegg Bert fegg is offline
Biker
 
Join Date: Oct 2017
Posts: 21
Sportster/Buell Model: Xl Custom
Sportster/Buell Year: 2001
Other Motorcycle Model: James comet 98cc
Other Motorcycle Year: 1956
Reputation: 10
Bert fegg is an unknown quantity at this point
Default

Sorry should have said filter off and slide up throttle open, also plugs swapped out for new, leads also changed over, she fired up on both cylinders straight away but this has been whats happening on both sets leads plugs etc, then it will start on only rear cylinder firing up.
Reply With Quote
  #32  
Old 3rd March 2021
wedge's Avatar
wedge wedge is offline
XL FORUM TEAM MEMBER
 
Join Date: Jun 2010
Posts: 11,971
Sportster/Buell Model: 1200R
Sportster/Buell Year: 2005
Other Motorcycle Model: 5 bikes and 1 quad
Reputation: 7365142
wedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond repute
Default

You are only at about 35' above sea level in London if my search was correct, so I am thinking that you should be around 200# static compression and it should pump up fast, which it did do. 145 sounds very low, however; since it is same in both I wouldn't expect to see the problem you are having.
__________________
A Biker is not just any guy who rides... that's a motorist.
A guy that gets up and rides again after every crash... that's a Biker.

Whitworth Fork Brace: http://xlforum.net/forums/m...outme&simple=1
Reply With Quote
  #33  
Old 3rd March 2021
IXL2Relax's Avatar
IXL2Relax IXL2Relax is offline
XL FORUM TEAM MEMBER
 
Join Date: Feb 2013
Location: Let Freedom Ring in PA
Posts: 8,442
Sportster/Buell Model: Sportster 883►1200
Sportster/Buell Year: 1994
IXL2Relax has disabled reputation
Default

Quote:
Originally Posted by wedge View Post
You are only at about 35' above sea level in London if my search was correct, so I am thinking that you should be around 200# static compression and it should pump up fast, which it did do. 145 sounds very low, however; since it is same in both I wouldn't expect to see the problem you are having.
According to our research for the SP, the 2004+ 1200 engines should have a minimum of 180psi - While the earlier 1200 models should have a minimum of 150psi.

This is why I suggested a shot of starting fluid down the throat when it is missing on the front cylinder, to see if the increased combustibility would fire off in that missing cylinder.

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For Sportster Tech Info:
Ride The Sportsterpedia - A Toll-Free XLForum Information Highway!
__________________
### The ride is more enjoyable to nowhere in particular! ###
Reply With Quote
  #34  
Old 3rd March 2021
Bert fegg Bert fegg is offline
Biker
 
Join Date: Oct 2017
Posts: 21
Sportster/Buell Model: Xl Custom
Sportster/Buell Year: 2001
Other Motorcycle Model: James comet 98cc
Other Motorcycle Year: 1956
Reputation: 10
Bert fegg is an unknown quantity at this point
Default

The compression tester I use is not the best so didnt want to screw in overtight otherwise might crush the orings, I shall do another comp test tomorrow .
Reply With Quote
  #35  
Old 4th March 2021
Bert fegg Bert fegg is offline
Biker
 
Join Date: Oct 2017
Posts: 21
Sportster/Buell Model: Xl Custom
Sportster/Buell Year: 2001
Other Motorcycle Model: James comet 98cc
Other Motorcycle Year: 1956
Reputation: 10
Bert fegg is an unknown quantity at this point
Default

Just done a compression test (warm) with a decent tester, slide up throttle fully open the readings are
Rear 152
front 150

she started on the button on both cyl but after a minute decided to want to only fire on rear for about 5 sec then back to 2 cyl

leads swapped and replaced
plugs replaced
coil replaced
ign module replaced with oem used but assured was a good working one which i obtained from a seller (ebay USA) I was also unaware that these oem modules were no longer in production so purchased this thinking I was lucky to find one (lesson learnt)

valves and springs all good (assumed) from visual inspection & compression readings

to summarize bike decides to fire on both cylinders one day and only one cyl on another day.

I am hoping at the end of the day it is a wonky ign module but it is an expense I don't need if its not.
Reply With Quote
  #36  
Old 4th March 2021
IXL2Relax's Avatar
IXL2Relax IXL2Relax is offline
XL FORUM TEAM MEMBER
 
Join Date: Feb 2013
Location: Let Freedom Ring in PA
Posts: 8,442
Sportster/Buell Model: Sportster 883►1200
Sportster/Buell Year: 1994
IXL2Relax has disabled reputation
Default

Quote:
Originally Posted by Bert fegg View Post
ign module replaced with oem used
Well - You replaced all the typical suspects...

You might try opening the nosecone and cleaning the Cam Position Sensor on the backside of the module. If you spray any electrical cleaner in there, be sure to blow out any excess liquid or dirt, etc, when done.

While there, double-check that the rotor cup is not loose or damaged in any way.

Put everything back where it belongs and set the static timing with the LED on the module.

I have my doubt whether this will affect the problem, but short of replacing it with a known good, new, aftermarket module, this is about all you can do with the existing module.

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For Sportster Tech Info:
Ride The Sportsterpedia - A Toll-Free XLForum Information Highway!
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 02:50.


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