hey if your not going to race it,,you can get away with murder on small engines!!just lap those valves ,,youve done a good clean up so far,the guides are crucial though,,yeah yeah ,,if you do the guides etc ,,this where plan A becomes plan B ,a bit of wear ,?,just lap those valves and put it back together,see whats its like,a good de-coke may be all you want to do!!youll be suprised!!,,if your keen to tinker and learn,,pulling the head again isnt a big deal,,ive removed and replaced the head on my 500 three times ,over 16000 klms,,using the same head gasket over and over,to machine the chamber volume to achive a desired compression ratio and balance,,ide never do that to a paying friend though,.ide make em buy two more gaskets and actually use them..