The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: Adtrac on 15.02. 2025 12:36

Title: A10 ignition timing question
Post by: Adtrac on 15.02. 2025 12:36

What cylinder should ignition timing be set from  , left or right and what ignition pick up does that equate to ?
1954 A10 Golden Flash

Title: Re: A10 ignition timing question
Post by: Triton Thrasher on 15.02. 2025 14:24

It’s risky not checking timing on both cylinders.  I set it on the drive side, because it’s near me when I’m playing with the points, then I check the timing side.

Always recheck after tightening the drive pinion nut.

When a cylinder is near TDC after the compression stroke, the brass segment in the HT slip ring will be touching one of the pickup brushes. That is the pickup for that cylinder.

Title: Re: A10 ignition timing question
Post by: CheeserBeezer on 15.02. 2025 15:01

The heel of the points is nearest to the pickup which should be connected to the firing cylinder.

Title: Re: A10 ignition timing question
Post by: a101960 on 15.02. 2025 19:16

If you get wrong just swap the HT leads over. Iv'e done that a few times.

Title: Re: A10 ignition timing question
Post by: trevinoz on 15.02. 2025 20:38

I set them left pick-up to left cylinder.
Left pick-up being the rear one.