BSA Owners' Club Forum

The BSA Workshop => Twins => Topic started by: Old Biker on 06 June, 2017, 10:38:39

Title: 1965 A65 ignition timing
Post by: Old Biker on 06 June, 2017, 10:38:39
Hi All,
This "Old biker" is in need of some knowledge! Having checked various sites and asked a question of the model specialist I admit to being somewhat confused about which way to go with the timing on the A65. The bike has Boyer electronic ignition and Eric advised that SRM recommended 32 btdc as the best timing for modern fuel but I am/was reluctant to stray from standard although I do appreciate that modern fuel is very different from the fuel I used in 1965.

I am/was in two minds whether to use the A50 timing of 34 btdc using the timing plug the "wrong" way around for the A65 which took the timing nearer to the SRM figure for modern fuel. However, I am also aware that other members with an A65 using electronic ignition use the standard 37 btdc and tune the carb to suit modern fuel along with an appropriate spark plug and have no issues.

Another member, who I owe several drinks for the help in getting the bike up and running, suggested that I put this topic on the forum to see how other members have dealt with this issue. Over to you.

Cheers, Old Biker

When you converted to Boyer did you use a specific plug cap as seems to be recommended by some, the plug caps on my bike at present are just the rubber waterproof variety with no resistors.
Title: Re: 1965 A65 ignition timing
Post by: JulianS on 06 June, 2017, 17:46:49
Looking at the Pitmans book of BSA they advise time on the A50 figures. The 1966 on manuals show the timings as 34 btdc.

I would try 34 to start with and adjust if necessary.
Title: Re: 1965 A65 ignition timing
Post by: Old Biker on 06 June, 2017, 22:10:26
Thanks Julian, sounds like a plan