Hey all. I recently started working on another '74 400 and am trying to get spark in the motor. I know it must either be points or coils, but does anyone know how to check the coils to see if they are good? Any insight appreciated.
thanks
Adam
340/5 CCW
340/5 CCW
Adam Epp
Winnipeg, MB, Canada
74 400 (2 - sold)
75 800 (motor in pieces, next on the resto list)
75 X4 Special (bare tunnel, stripped)
76 340 Cyclone (resto in progress)
76 340 Cyclone (bare tunnel, stripped)
Winnipeg, MB, Canada
74 400 (2 - sold)
75 800 (motor in pieces, next on the resto list)
75 X4 Special (bare tunnel, stripped)
76 340 Cyclone (resto in progress)
76 340 Cyclone (bare tunnel, stripped)
-
harleysportster
- Posts: 2965
- Joined: Thu Jul 14, 2005 12:00 am
- Real Name: Pat Scott
- Location: Southeast Pa.
340/5 CCW
check this out in the FAQ section.
http://z12.invisionfree.com/jdsleds/index.php?showtopic=294
http://z12.invisionfree.com/jdsleds/index.php?showtopic=294
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
340/5 CCW
Thanks for that, i think i already read that post in the past but a refresher is always good. But how would you go about testing the coils?
Adam Epp
Winnipeg, MB, Canada
74 400 (2 - sold)
75 800 (motor in pieces, next on the resto list)
75 X4 Special (bare tunnel, stripped)
76 340 Cyclone (resto in progress)
76 340 Cyclone (bare tunnel, stripped)
Winnipeg, MB, Canada
74 400 (2 - sold)
75 800 (motor in pieces, next on the resto list)
75 X4 Special (bare tunnel, stripped)
76 340 Cyclone (resto in progress)
76 340 Cyclone (bare tunnel, stripped)
-
400brian
- Posts: 5626
- Joined: Wed Jul 20, 2005 12:00 am
- Real Name: James T. Kirk
- Location: South Central Wisconsin
340/5 CCW
The Service Manual shows coil testing being done with a Merc-O-Tronic Analyzer.
This tool alowed you to test fire the coil at established amperages to determine its condition. Without this tool, you seem to be limited to resistance checks.
To check the resistance of the coil. You connect one end of your ohm meter to the plug wire terminal, the other to the steel laminations. ( they call this coil continuity, I think it is also secondary resistance )
You can also check it with your meter connected to the laminations and the other to the feed wire. ( Primary resistance )
Your '74 600 should have a Kokusan system.
The secondary resistance should read 5.2 ohms +/- 10%
The primary resistance should read 1.65 ohms +/- 10%
Can anyone confirm I have this right?
This tool alowed you to test fire the coil at established amperages to determine its condition. Without this tool, you seem to be limited to resistance checks.
To check the resistance of the coil. You connect one end of your ohm meter to the plug wire terminal, the other to the steel laminations. ( they call this coil continuity, I think it is also secondary resistance )
You can also check it with your meter connected to the laminations and the other to the feed wire. ( Primary resistance )
Your '74 600 should have a Kokusan system.
The secondary resistance should read 5.2 ohms +/- 10%
The primary resistance should read 1.65 ohms +/- 10%
Can anyone confirm I have this right?
'09 Vintage Challenge Survivor, and I wasn't late for supper!
'10, '11, '12, '13,'14,'15,'16,'17, '18, 19, 20, 21, 22 Vintage Challenge Survivor !
72 400 restored, Father bought new in '71
73 X8 restored
'74 340 green machine
'74 X8 9 time VC finisher
'78 Spitfire in progress
2 '75 340S 1 running, one on deck
'78 LF 440 future CC clone
'73 Skiroule RTX 440, 500 mi.
340/5 CCW
I assume you meant '74 400 Brian, thanks for your help ill try those resistance checks as soon as i get back to the shop my sled is sitting in.
Adam Epp
Winnipeg, MB, Canada
74 400 (2 - sold)
75 800 (motor in pieces, next on the resto list)
75 X4 Special (bare tunnel, stripped)
76 340 Cyclone (resto in progress)
76 340 Cyclone (bare tunnel, stripped)
Winnipeg, MB, Canada
74 400 (2 - sold)
75 800 (motor in pieces, next on the resto list)
75 X4 Special (bare tunnel, stripped)
76 340 Cyclone (resto in progress)
76 340 Cyclone (bare tunnel, stripped)
-
400brian
- Posts: 5626
- Joined: Wed Jul 20, 2005 12:00 am
- Real Name: James T. Kirk
- Location: South Central Wisconsin
340/5 CCW
Yes, '74 400 is what I meant to type :ph43r:
The other way of dealing with this situation, would be to use the time honored tradition of replacing the coil in question with a "known good unit", and observing the results.
The other way of dealing with this situation, would be to use the time honored tradition of replacing the coil in question with a "known good unit", and observing the results.
'09 Vintage Challenge Survivor, and I wasn't late for supper!
'10, '11, '12, '13,'14,'15,'16,'17, '18, 19, 20, 21, 22 Vintage Challenge Survivor !
72 400 restored, Father bought new in '71
73 X8 restored
'74 340 green machine
'74 X8 9 time VC finisher
'78 Spitfire in progress
2 '75 340S 1 running, one on deck
'78 LF 440 future CC clone
'73 Skiroule RTX 440, 500 mi.
340/5 CCW
Most likely you need to clean the points. This is very common on old sleds that have been sitting. Ive never haad an external coil fail on a ccw but it does not hurt to check.