Greetings. I went to swap the oil on a brand new (non ridden) 07 wr450f. When removing the engine guard, I noticed green coolant on the guard & on the frame. Not much though. After cleaning up the coolant and re-starting the bike, it appears that the right side crankcase cover gasket has failed. Bummer. Is an uprated gasket available? Is this gasket prone to failure? Also, I bought a new spark plug to replace the 'old' one as the bike is not starting up very easily (hence service). According to the manual Im to use an NGK CR8 plug. I picked up an NGK iridium IX plug, numbered CR8EHIX-9 3797. Is this a straight swap? Are these pre-gapped or do they need gapping? Whilst the crankcase cover is off, what mods should I consider? Impeller upgrade? Thanks for your time and help.