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I have Bosch, NGK, Champion, Oregons equivelent and a couple no namers in stock and I can't say any of the 3 first is better than the other. Experiances... Had a couple 357's here last year from same owner and Bosch plug that lower electrode fell of on. Seen many that it didn't. Seen broken...

If you put it in when new and it has a washer that is to compress, this is correct. If you re-use same plug it is not correct as washer is already compressed. Usually the threads in cylinder go before anything happen to plug. I rarely re-use old plugs unless it is a collectors item or very hard...

Champion CJ7Y and RCJ7Y I use most here today. Bosch WSR6F/NGK BPMR6A/Champion RCJ8Y is same plug I think. I think you have correct plug Stig. Perhaps it is overtightened? If washer go plat it will not absorb vibrations and handle heat efficiently.

Good. that narrows it down a bit more. You have number on it perhaps?

So when You say it ran "a hour or so" what does that mean? Two tanks+ or one tank with stop(s)? Tank vent issues is usually noticed as fuel is going out, no air coming in and a negative pressure is built up instead of Neutral or positive. It could be a carb leak if yours has that accelerator...

Yes, but there is different ones... What do you put in it?

What plug is this?

Sparkplugs not sitting on a cone has a compressing washer that is compressed once. To get right torq you seat it then 1/4 turn and you have it sitting correct. I rarely re use plugs for a many reasons, this is one of them. MB How long you run saw on a tank of fuel?