Hard start after sitting for 30 min

buschkj24

XS400 Enthusiast
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Location
wisconsin
Hey guys, I was wondering if anyone has had any issue with hard starting after letting the bike sit for 30 min after a ride? Seems like if I take it and run into a shop or something and try starting it within a half hour it fires right up, now let it sit for 30-45 min if will crank and crank unless I give her some throttle. If it's stone cold it fires right off. The plugs are brand new, valves are in synch, and the carbs are good. Any ideas because I'm at a loss!:doh:
 
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