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Carb probs?

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So my bike which is a four stroke is fowling plugs after every ride. Never had this problem before I adjusted the fuel screw and leaned it out a tad. The plug never fouls during the ride. For example at the track. Put a brand new plug in started right up rode all day long taking multiple breaks during which the bike was of course not running but would start up immediately after. Then put the bike away for the night and all morning go out to clean it and it's fouled the plug?! Any tips tricks or ideas what this may be? And yes I have already tried octane booster.

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If the valves seals are bad, blue smoke will come out the exhaust on start  up.

 

To replace valve seals you have to remove the head and valves.

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Ok so it's not the valves

I'm thinking it's the needle in the carb seating bad and letting some gas in to foul the plug

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