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Autolite 405

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=212094
Printed Date: 17 Sep 2026 at 1:43pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: Autolite 405
Posted By: Josh(NE)
Subject: Autolite 405
Date Posted: 27 Aug 2026 at 6:02pm
What are you all using as replacements for autolite 405s? Now that they are nla.

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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake


Replies:
Posted By: Coke-in-MN
Date Posted: 27 Aug 2026 at 6:59pm

Autolite A405 - Alternative spark plugs

There is 1 replacement spark plug for Autolite A405. The cross references are for general reference only, please check specifications for your application.

Autolite A405 replacement spark plugs

  • https://www.sparkplug-crossreference.com/convert/MTRCRFT_PN/AGS4CF4" rel="nofollow - Motorcraft AGS4CF4

Indirect matches

There are 154 replacements for Autolite A405. These are indirect matches for Autolite A405.

  • https://www.sparkplug-crossreference.com/convert/ACCEL/146" rel="nofollow - Accel 146
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/41-832" rel="nofollow - ACDelco 41-832
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/44N" rel="nofollow - ACDelco 44N
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/44XL" rel="nofollow - ACDelco 44XL https://www.amazon.com/dp/B0CHMX156R?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/45N" rel="nofollow - ACDelco 45N https://www.amazon.com/dp/B009Z1PHIU?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/45XL" rel="nofollow - ACDelco 45XL https://www.amazon.com/dp/B008QDEQY4?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/46N" rel="nofollow - ACDelco 46N https://www.amazon.com/dp/B00GGZSON8?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/46XL" rel="nofollow - ACDelco 46XL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/47XL" rel="nofollow - ACDelco 47XL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/C44N" rel="nofollow - ACDelco C44N
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/C44XL" rel="nofollow - ACDelco C44XL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/CR44N" rel="nofollow - ACDelco CR44N
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/CR44XL" rel="nofollow - ACDelco CR44XL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/CR45L" rel="nofollow - ACDelco CR45L
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/CR45XL" rel="nofollow - ACDelco CR45XL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/R44CXL" rel="nofollow - ACDelco R44CXL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/R44N" rel="nofollow - ACDelco R44N
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/R44XL" rel="nofollow - ACDelco R44XL https://www.amazon.com/dp/B0CHMX156R?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/R45N" rel="nofollow - ACDelco R45N https://www.amazon.com/dp/B009Z1PHIU?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/R45XL" rel="nofollow - ACDelco R45XL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/R46N" rel="nofollow - ACDelco R46N
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/R46XL" rel="nofollow - ACDelco R46XL
  • https://www.sparkplug-crossreference.com/convert/AC_DELCO/S44XL" rel="nofollow - ACDelco S44XL
  • https://www.sparkplug-crossreference.com/convert/allischalmers/4905797" rel="nofollow - Allis-Chalmers 4905797
  • https://www.sparkplug-crossreference.com/convert/allischalmers/74905796" rel="nofollow - Allis-Chalmers 74905796
  • https://www.sparkplug-crossreference.com/convert/allischalmers/74905798" rel="nofollow - Allis-Chalmers 74905798
  • https://www.sparkplug-crossreference.com/convert/allischalmers/79001651" rel="nofollow - Allis-Chalmers 79001651
  • https://www.sparkplug-crossreference.com/convert/atlas/C90R" rel="nofollow - Atlas C90R
  • https://www.sparkplug-crossreference.com/convert/AUTOLITE/A404" rel="nofollow - Autolite A404
  • https://www.sparkplug-crossreference.com/convert/AUTOLITE/A405" rel="nofollow - Autolite A405
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/4235" rel="nofollow - Bosch 4235
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/7504" rel="nofollow - Bosch 7504
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/7510" rel="nofollow - Bosch 7510
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/7598" rel="nofollow - Bosch 7598
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/7599" rel="nofollow - Bosch 7599
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W10CC" rel="nofollow - Bosch W10CC
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W125T2" rel="nofollow - Bosch W125T2
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W125TR2" rel="nofollow - Bosch W125TR2
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W145T2" rel="nofollow - Bosch W145T2
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W175T2" rel="nofollow - Bosch W175T2
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W7CC" rel="nofollow - Bosch W7CC
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W7CCO" rel="nofollow - Bosch W7CCO
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W7CCX" rel="nofollow - Bosch W7CCX
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W7CX" rel="nofollow - Bosch W7CX
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W8C" rel="nofollow - Bosch W8C
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W8CC" rel="nofollow - Bosch W8CC
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W8CO" rel="nofollow - Bosch W8CO
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W95T2" rel="nofollow - Bosch W95T2
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W9C" rel="nofollow - Bosch W9C
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/W9CC" rel="nofollow - Bosch W9CC
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/WR7CC" rel="nofollow - Bosch WR7CC https://www.amazon.com/dp/B000PKX8AO?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/WR7CCX" rel="nofollow - Bosch WR7CCX https://www.amazon.com/dp/B000PKX8AO?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/WR7CX" rel="nofollow - Bosch WR7CX
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/WR8CP" rel="nofollow - Bosch WR8CP
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/WR9C" rel="nofollow - Bosch WR9C
  • https://www.sparkplug-crossreference.com/convert/BOSCH_PN/WR9CC" rel="nofollow - Bosch WR9CC
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/123" rel="nofollow - Champion 123
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/2123" rel="nofollow - Champion 2123
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/504" rel="nofollow - Champion 504 https://www.amazon.com/dp/B0013THZWI?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/530" rel="nofollow - Champion 530
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/590" rel="nofollow - Champion 590
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/642" rel="nofollow - Champion 642
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/N21" rel="nofollow - Champion N21 https://www.amazon.com/dp/B0013THZWI?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/N288" rel="nofollow - Champion N288
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/N5" rel="nofollow - Champion N5
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/N6" rel="nofollow - Champion N6 https://www.amazon.com/dp/B009VC645I?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/N6C" rel="nofollow - Champion N6C
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/N8" rel="nofollow - Champion N8
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/RN5" rel="nofollow - Champion RN5
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/RN5C" rel="nofollow - Champion RN5C
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/RN8" rel="nofollow - Champion RN8
  • https://www.sparkplug-crossreference.com/convert/CHAMP_PN/XN5" rel="nofollow - Champion XN5
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/3016" rel="nofollow - Denso 3016
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/3108" rel="nofollow - Denso 3108
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W14E" rel="nofollow - Denso W14E
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W14EKR-S11" rel="nofollow - Denso W14EKR-S11
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W16EKR-S11" rel="nofollow - Denso W16EKR-S11
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W16ES" rel="nofollow - Denso W16ES
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W16ES-L" rel="nofollow - Denso W16ES-L
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W16ES-L11" rel="nofollow - Denso W16ES-L11
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W16ES-U" rel="nofollow - Denso W16ES-U
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W16ESR-U" rel="nofollow - Denso W16ESR-U
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W17ES" rel="nofollow - Denso W17ES
  • https://www.sparkplug-crossreference.com/convert/DENSO_PN/W20ES-U11" rel="nofollow - Denso W20ES-U11
  • https://www.sparkplug-crossreference.com/convert/masseyferguson/834245-MI" rel="nofollow - Massey Ferguson 834245-MI
  • https://www.sparkplug-crossreference.com/convert/MIGHTY/404" rel="nofollow - Mighty 404
  • https://www.sparkplug-crossreference.com/convert/MIGHTY/GR3" rel="nofollow - Mighty GR3
  • https://www.sparkplug-crossreference.com/convert/MOPAR/P-6-3S" rel="nofollow - Mopar P-6-3S
  • https://www.sparkplug-crossreference.com/convert/MOPAR/P-6-4S" rel="nofollow - Mopar P-6-4S
  • https://www.sparkplug-crossreference.com/convert/MOPAR/P-6-4SR" rel="nofollow - Mopar P-6-4SR
  • https://www.sparkplug-crossreference.com/convert/MOPAR/P-6-6S" rel="nofollow - Mopar P-6-6S
  • https://www.sparkplug-crossreference.com/convert/MOPAR/P-N-21" rel="nofollow - Mopar P-N-21
  • https://www.sparkplug-crossreference.com/convert/NAPA/X561" rel="nofollow - Napa X561
  • https://www.sparkplug-crossreference.com/convert/NAPA/X961" rel="nofollow - Napa X961
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/1097" rel="nofollow - NGK 1097
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/3724" rel="nofollow - NGK 3724
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/3824" rel="nofollow - NGK 3824 https://www.amazon.com/dp/B00BMVFWLS?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/3826" rel="nofollow - NGK 3826
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/4129" rel="nofollow - NGK 4129 https://www.amazon.com/dp/B004A73NTO?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/4722" rel="nofollow - NGK 4722
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/4922" rel="nofollow - NGK 4922
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/5136" rel="nofollow - NGK 5136
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/6324" rel="nofollow - NGK 6324
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/6410" rel="nofollow - NGK 6410
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/6523" rel="nofollow - NGK 6523
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/6723" rel="nofollow - NGK 6723
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/7030" rel="nofollow - NGK 7030
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/7037" rel="nofollow - NGK 7037
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/7434" rel="nofollow - NGK 7434 https://www.amazon.com/dp/B000HDDIPY?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/7910" rel="nofollow - NGK 7910
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/904" rel="nofollow - NGK 904
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/907" rel="nofollow - NGK 907
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/928" rel="nofollow - NGK 928 https://www.amazon.com/dp/B07S9HGMW2?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/936" rel="nofollow - NGK 936
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B4E" rel="nofollow - NGK B4E https://www.amazon.com/dp/B004A73NTO?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B4ES" rel="nofollow - NGK B4ES https://www.amazon.com/dp/B004A73NTO?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B5EB" rel="nofollow - NGK B5EB
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B5EB-11" rel="nofollow - NGK B5EB-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B5ES" rel="nofollow - NGK B5ES https://www.amazon.com/dp/B000CJ8CUO?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B5ES-11" rel="nofollow - NGK B5ES-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B5EV" rel="nofollow - NGK B5EV
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B5FB-11" rel="nofollow - NGK B5FB-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B6EB" rel="nofollow - NGK B6EB https://www.amazon.com/dp/B000HDDIPY?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B6EB-11" rel="nofollow - NGK B6EB-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B6EB-L-11" rel="nofollow - NGK B6EB-L-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B6ES-11" rel="nofollow - NGK B6ES-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/B6EVX" rel="nofollow - NGK B6EVX
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR4ES" rel="nofollow - NGK BR4ES
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR5EB" rel="nofollow - NGK BR5EB
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR5ES" rel="nofollow - NGK BR5ES
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR5ES-11" rel="nofollow - NGK BR5ES-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR6EB" rel="nofollow - NGK BR6EB
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR6EB-11" rel="nofollow - NGK BR6EB-11
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR6ES" rel="nofollow - NGK BR6ES https://www.amazon.com/dp/B00BMVFWLS?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BR6ES-11" rel="nofollow - NGK BR6ES-11 https://www.amazon.com/dp/B00BMVFWLS?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/NGK_PN/BUR6EB-11" rel="nofollow - NGK BUR6EB-11
  • https://www.sparkplug-crossreference.com/convert/precisiontune/P4GR3" rel="nofollow - Precision Tune P4GR3
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14G3" rel="nofollow - Prestolite 14G3
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14G4" rel="nofollow - Prestolite 14G4
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14G5" rel="nofollow - Prestolite 14G5
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14G7" rel="nofollow - Prestolite 14G7
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14GR3" rel="nofollow - Prestolite 14GR3
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14GR4" rel="nofollow - Prestolite 14GR4
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14GR5" rel="nofollow - Prestolite 14GR5
  • https://www.sparkplug-crossreference.com/convert/PRESTOLITE/14GR7" rel="nofollow - Prestolite 14GR7
  • https://www.sparkplug-crossreference.com/convert/SPLITFIRE/SF40D" rel="nofollow - Splitfire SF40D
  • https://www.sparkplug-crossreference.com/convert/SPLITFIRE/SM40D" rel="nofollow - Splitfire SM40D
  • https://www.sparkplug-crossreference.com/convert/torch/F7C" rel="nofollow - Torch F7C
  • https://www.sparkplug-crossreference.com/convert/torch/F8C" rel="nofollow - Torch F8C https://www.amazon.com/dp/B0F3XG683H?tag=crossrefere-text-20&linkCode=osi&th=1&psc=1" rel="nofollow - Buy from Amazon
  • https://www.sparkplug-crossreference.com/convert/torch/F8RC" rel="nofollow - Torch F8RC
  • https://www.sparkplug-crossreference.com/convert/VALLEY_FORGE/204" rel="nofollow - Valley Forge 204
  • https://www.sparkplug-crossreference.com/convert/VALLEY_FORGE/204R" rel="nofollow - Valley Forge 204R
  • https://www.sparkplug-crossreference.com/convert/VALLEY_FORGE/205" rel="nofollow - Valley Forge 205
  • https://www.sparkplug-crossreference.com/convert/VALLEY_FORGE/205R" rel="nofollow - Valley Forge 205R

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Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.

Posted By: Coke-in-MN
Date Posted: 27 Aug 2026 at 7:13pm

Specifications for Champion N5C

Thread diameter
14mm
Thread reach
19mm
Hex size
21mm
Seat type
flat
Tip
non projected
Construction
Standard construction
Terminal
Removable
Gap
0.7 mm


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Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.

Posted By: steve(ill)
Date Posted: 27 Aug 2026 at 8:34pm
what engine are you putting the 405 in ??

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Like them all, but love the "B"s.

Posted By: Ed (Ont)
Date Posted: 27 Aug 2026 at 9:35pm
Originally posted by Coke-in-MN Coke-in-MN wrote:

Specifications for Champion N5C

Thread diameter
14mm
Thread reach
19mm
Hex size
21mm
Seat type
flat
Tip
non projected
Construction
Standard construction
Terminal
Removable
Gap
0.7 mm
Is that not an old style plug that was built to Imperial measurements?  So 3/4" reach and 13/16" hex. What thread was it?

Posted By: Ed (Ont)
Date Posted: 28 Aug 2026 at 8:56am
To answer my own question the thread size is metric - 14 x 1.25. I did not know that even tho I've installed hundreds of them. But I think the hex was not metric???? 

Posted By: Josh(NE)
Date Posted: 28 Aug 2026 at 10:57am
190xt is what I am trying to tune up, but I think that was the plug allis used in all gas engines from d17 and newer.

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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake

Posted By: Coke-in-MN
Date Posted: 28 Aug 2026 at 2:44pm
My Norton motorcycles use the N 5  Champion as well as other Mfg in that range , but over time I just use the N 5 -
 A while back a local discounter liquidator had some plugs - Champion lawn and garden - Looked up heat range and other specs = was a N5  - bought 30 plugs at 25 cents each 
 Now running them in my Moto-Guzzy as well 
Somehow the idea a spark plug is now a $6 to $9 cost item - ???? 

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Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.


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