HELP JETTING FOR CRF250X IN MISSOURI

04 CRF250X BONE STOCK AFTER 1200 TRAIL MILES TIGHT EXHAUST VALVES (.007) RIGHT AND LEFT. INTAKE VALVE LEFT .004 RIGHT VALVE ZERO LASH.COULD THIS INTAKE VALVE PROBLEM BE FROM BIKES RUNNING SO LEAN? WOULD RICHER MIXTURE BETTER LUBRICATE VALVE SEATS? ANY INFO? THANKS!

A zero clearenced valve is not going to change your mixture. Running more gas isnt going to do anything, neither is lead additives.

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