I have my plugs back and the one that closed up has a shiny abraded portion just on the bend of the side electrode, definitely looks like the valve.
I marked the position of the electrode, fitted one to the left hand cylinder and it pointed directly to the inlet valve, fitted the other plug and it pointed away from the inlet valve. The initial plug, fitted to the RH side, points to the exhaust valve, which doesn't concern me.
Bent Iridium Spark Plug Electrode
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Bent Iridium Spark Plug Electrode
I had the same problem on one of my G12 s.
I installed the pugs up so that the electrde was aligned to clear the inlet valves. For experimental reasons I used two washers under the plugs on the other G 1i2. Success with both methods both bikes
I installed the pugs up so that the electrde was aligned to clear the inlet valves. For experimental reasons I used two washers under the plugs on the other G 1i2. Success with both methods both bikes
Crafty
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Bent Iridium Spark Plug Electrode
you can buy different thickness washers called indexing spark plug washers to index your plugs.