BSA Owners' Club Forum

The BSA Workshop => Twins => Topic started by: royblackburn1@btinternet. on 13 November, 2017, 17:41:21

Title: reluctant starter
Post by: royblackburn1@btinternet. on 13 November, 2017, 17:41:21
Hi can anyone help before my right foot is damaged beyond repair my A65L is a poor starter when it was running the timing was set up using a strobe but refuses to start at times I have 12.6 volts at the battery when trying to start it is this enough volts to get the Boyer Bransden ignition working my concentric carbs do not have pilot jets in even when they where bought new would pilot jets help when easy start is squirted in it fires up. thanks Roy
Title: Re: reluctant starter
Post by: A10 JWO on 13 November, 2017, 18:00:16
Whats the spark like with the plugs out. I had a Boyer with a crack in the stator which made it intermittent.
Title: Re: reluctant starter
Post by: JulianS on 13 November, 2017, 18:37:56
Your carbs probably have a bush pilot jet, remove the air screw and look in you will see a brass insert which is the pilot bush.
Title: Re: reluctant starter
Post by: royblackburn1@btinternet. on 15 November, 2017, 10:07:44
thanks guys have checked your suggestions out I think it must be a fuel/air mixture problem, but it fires up with a squirt of easy start,(but what wouldn't)
Title: Re: reluctant starter
Post by: JulianS on 15 November, 2017, 10:17:10
These notes from Amal may help if you have not already seen them;

http://amalcarb.co.uk/rebuilding-mark-1-concentric-carburetter
Title: Re: reluctant starter
Post by: royblackburn1@btinternet. on 15 November, 2017, 17:21:01
thanks JulianS for the information real interesting reading my old workshop manual shows the pilot jet that was used before 67
Title: Re: reluctant starter
Post by: royblackburn1@btinternet. on 16 November, 2017, 10:13:35
Hi what voltage is required to run the Boyer/Bransden   ignition I get 12.6 is with engine stood is that ok
Title: Re: reluctant starter
Post by: JulianS on 16 November, 2017, 11:01:36
Have you tried the Boyer helpline?

http://www.boyerbransden.com/faultfinding.html
Title: Re: reluctant starter
Post by: DEREKANDERSON8 on 16 November, 2017, 13:53:29
12.6 should be plenty, mine will run on less than that.

Are plugs wet? Mine needs plenty of fuel to start but is single carb.

Title: Re: reluctant starter
Post by: royblackburn1@btinternet. on 16 November, 2017, 17:04:52
Thank you all lots of information to go at. Roy