Re: Spark Plug reach-why not use longer?
This is what you COULD be looking at: if the plug end projects slightly from the inner-surface of the head (rather than the threaded portion coming in flush with the inner surface) it could be because it is meant to be placing the spark nearest to the center of the combustion chamber at TDC. It's an effort to burn the fuel as efficiently as possible. This is just a guess, you understand, but I figure if it applies to cars - why not these little HT 2-smokers.
"There is nothing wrong with wanting a motorbike that is an extension of your personal taste and fashion sense; if you must ride somewhere, I say do it with style