It's unlikely that your problem (on an effectively stock bike) will be rectified with a thicker base gasket. Best thing to do is list the full specifications in the Setup Forum in the Members Area first.
I'd be more inclined to sort the oil injector or premix ratio and use a decent fully synthetic 2-stroke oil. You must have a dirt bike shop near you somewhere? They'll sell the best oils you can get locally. Even the Honda shop will more than likely only sell semi-synthetic.
Edit: Topic moved to public forum so some text ammeded regarding posting in Members Area.
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Andy.
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Last edited by Andy on Tue Sep 08, 2009 11:33 am; edited 1 time in total