The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: madsens on 04.04. 2026 20:24

Title: A10 misfiring on quick acceleration
Post by: madsens on 04.04. 2026 20:24

Hi all
I have been a bit hibernating from the forum, as I have not been using my A10 much - due to travelling and life in general, only occational use...

But I have a small problem.... Bike is starting ok, running ok, but if I try to accelerate fast (you know, right handle all the way) it's like the bike is hesitating/misfiring, then  accelerates, then same again, accelerate, hesitate/misfire, accelerate...
Only when doing a fast acceleration... If I do it nice and gently, running it up in speed, there is no problem...
I have cleaned the slipring, checked she gets enough fuel, so I guess it is ignition related...

So any ideas? my first thought would be sparkplugs, sparkplug cap, cables, pickups.... but any input welcome - I am planning to go to the Summercamp in Sweden (Oeland) in august, and I don't always ride easy and sedate... *smile*

regards
Joergen

Title: Re: A10 misfiring on quick acceleration
Post by: Swarfcut on 05.04. 2026 08:45

 Maybe a sticky points pivot, so I'd suggest a little maintenance. Points plate off and a clean up of the points and a dab of oil on that pivot. Add few drops to the felt wick in the cam ring at the same time. Simple to do and as good a place to start as any.

 Swarfy.

Title: Re: A10 misfiring on quick acceleration
Post by: madsens on 05.04. 2026 10:04

Thanks Swarfy - I will try that...
And then another test drive - as soon as the wind calms down, storm at the moment with bridges and ferrys canceled...

regards Joergen

Title: Re: A10 misfiring on quick acceleration
Post by: Triton Thrasher on 05.04. 2026 11:15

Mechanics used to say plugs first, then points, in almost any reported running fault.

Failing to fire under load is often an HT issue.