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No spark offside plug.

Posted: Fri Mar 25, 2011 4:39 pm
by OLD SHEP
Have lost spark on offside plug for my 1956 Model 30. Last ride bike would only tick over or take a tiny bit of throttle. Now won't start. New plugs, cleaned carb. Checked slip ring and carbon brushes, looked good. Checked sparks, none on offside plug, the other looked good. Any magxperts on here seen this before? Chris.

No spark offside plug.

Posted: Fri Mar 25, 2011 7:11 pm
by 1608
Have you tried another plug. Check that the mag points are opening for both cylinders.

No spark offside plug.

Posted: Sat Mar 26, 2011 9:01 am
by Rob Harknett
What above connection to the mag and brush

No spark offside plug.

Posted: Sat Mar 26, 2011 4:37 pm
by Don Madden
Check for uneven wear of armature where the ground brush contacts & same for the slipring. Spark erosion will eventually pit both where the brushes no longer make contact. Cheers, Don.

No spark offside plug.

Posted: Thu Apr 21, 2011 5:25 pm
by OLD SHEP
I've ended up sending the mag to Plymouth for a rebuild. 'Kinell. That's going to be expensive. Chris