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Engine fuel trouble


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I have a 1981 Yamaha 1100 Special that I have enjoyed riding for years.  At he end of the season last year I put the bike away in the shop (was running great).  This spring I got the bike out and filled it up with fresh fuel.  It starts perfectly and idles fine, will even rev up normal.  Three different times now I have got on it to ride and make it about a mile down the road and it starts bogging down and blowing smoke out of the exhaust and dies. I trailer it home and park it.  After a day or so I try it again and the exact same problem.  This has happened 3 times now.  I have put 2 new sets of spark plugs in it, with no change.  Any ideas of what to check out would be appreciated.  Thanks

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Was there anything showing on the plugs, excessively wet or black. Ig is easier to check than carbs but ultimately it sounds like you need to give the carbs a good clean. Your coming off choke at a mile or so as the engine gets up to temp and as she wants a leaner mixture it sounds like she isnt getting it and chokes out.

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Yes the plugs are wet when i check them.  I don't have to use the manual chock to get it to start cold, does it automatically choke until the engine warms up?

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It dosn"t need choke ?  [ or its auto choke ? ]   sounds like  its stuck on. 

that would bog it wen warmed up ,

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Yip "  follow the cable  to the lever,

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Yep, sounds like perm choke. May not need full choke in the summer but should always need a little from stone cold.

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