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@BrickMan
Anyone know the difference between an ngk cr7xxx plug and a cr9xxx plug? Is it the temperature or the internal resistance?
Just found scooter had a cr7xxx plug when book says 9 is the right one. So ordered the latter as well as a bunch of jets to start messing it up.
Also drained stinky 4 year old fuel mixed 1:1 with fresh fuel. Everything clean but idling like crap and boggs at higher revs despite no fuel flow issue. New fuel in clean tank much better but still slightly boggy, Internet folk say that's normal as they are under jetted to comply with restriction regs and increase economy, hence more jet going on it