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from platinums to a classic style.. advance the timing a few degrees...and retard. See what works.
I went through this on a rock chunk steel 1950s style NGK plug in a 1987 subaru. the platinums fired so fast I had to retard the timing.
platimus are cheap.. just slap some back in? The inlines are sensitive however... hanging onto crud until chemistry is feeding the vents. The classic design must be a better choice? stay solid for the debris..
boxers do not need it. I am bragging.
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