BSA Owners' Club Forum

The BSA Workshop => Bantam => Topic started by: griffo on 16 June, 2017, 08:29:46

Title: Four stroking !
Post by: griffo on 16 June, 2017, 08:29:46
  D10 engine in my D7 has started four stroking at low revs. Any thing below 40 mph in top she chugs along. Higher speeds OK. From about thirty she pulls like a dream and with open throttle runs as she should. Slow down and try to do 30 she four strokes again. Fuel problems or carb seting , maybe timing ?   Griff
Title: Re: Four stroking !
Post by: JulianS on 17 June, 2017, 09:05:19
Four stroking usually means too rich mixture.
Title: Re: Four stroking !
Post by: griffo on 18 June, 2017, 21:27:50
Plug a nice light brown colour. Dropped the needle a notch to see if that helps..
I'll give it a tootle to-morow...  :-\  Griff