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Honda MX & Off-Road Dirt Bikes
CRF250: Press fitted spark plug tube - What does this mean?
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[QUOTE="Rich Rohrich, post: 727388, member: 16241"] It means there is a tube pressed into a machined boss in the cylinder head above the spark plug that allows access to the sparkplug through the top of the valve cover. It's a centrally located sparkplug, so basically the tube just provides a way to seperate the valve train (and it's oil) from the sparkplug. BTW, the valve seats are pressed into every late model high four-stroke with aluminum heads, including this one. :) [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
CRF250: Press fitted spark plug tube - What does this mean?
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