1. mystery air gap

    Hi everyone I have been happily running my 850mk2a with Tri Spark ignition for about six years, on a run in 2021 it oddly started to backfire and I have checked all the usual simple things like (plug gaps - timing - carbs - air leaks ) today I had a look at the ignition stator and rotor and the...
  2. 850 Tri-Spark Problem

    Gents, Running into an issue with a newly installed tri-spark set up on a ‘73 850 Commando. After a complete rebuild the bike looks great and runs well.... kind of. After setting the initial timing on the tri spark the bike will start relatively easy. However after I shut the bike down, the...