It does seem to be like a mis-fire, but if it's caused by the free play I imagine it will affect all 4 cylinders to some extent so the plugs would all look the same. Just got some BP6HS to replace the aging BP7s that were fitted. Not sure why someone fitted 'hotter' plugs and a 'cooler' thermostat, maybe not alot of thought put into those choices. Still need to try standard dizzy from the Amazon to see what difference it makes.
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