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About graeme.butt1

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    Junior Member
  1. On the subject of Ngks, I’ve had three dud BPMR7A plugs out of the same box. Only time I’ve had faulty ones in 30 odd years. Just because it hasn’t happened before doesn’t mean it won’t [emoji1787]I always whip the plug cap off, and the stop wire, then hold the ht lead next to the cylinder to test, assuming the ht lead isn’t worn. Always listen to the transfer pop with the plug out too. Found a badly worn piston the other day, reasonable compression, not seized, but not transferring either. Plenty of spark but no go!! Wet plug!
  2. Dan’s 044 is now back up and running. The mystery breather turned out to be a vacuum valve for the automatic choke mechanism. If anyone else has this problem, the later cylinder without the extra pulse feed will work, but you need the carb, throttle and choke linkages to go with it. In this case, cleaning up the cylinder, and dropping in a meteor piston worked well!! This model has two pulse feeds, one for the fuel pump, and one for the auto choke. A new one on me, and I’ve pulled plenty of saws down over the years!!


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