BSA B31 Part 9 Barrel Piston & Ignition Timing

Starting on top end reassembly.
In this Video I fit a new piston and barrel, lap the head and do the ignition timing with my DIY magneto timing gizmo.

[@Cobra427Veight]

Hi ,hope you've got your bsa up and running ok . I am a new Bsa b33 owner 😁 , mine has small leak at barrel base , I might try a retorque first , I have also notice they have a "lot" of windage , when I removed the top timing cover inspection cover wow , mine is 600 cc , it has a top breather which is too small , I might increase the size and add a lower one to that timing cover to a breather tank , plenty of room beside carby. , engine doesn't smoke , any thoughts of what others do .Cheers .

[@InTheShedUK]

From what I have read the breather system is not very efficient and almost useless over 3000 rpm, if you are getting a lot of oil out of the breather pipe check your cam spindle seals.