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How do I fix my 1980 yamaha special?

My 1980 yamaha special 850cc will start up and run but when I pull the throttle back it dies, what might be the problem and how do I fix it.
Kasey Flier, April 2008
Does your bike have a set of points? not a CDI ignition.
If it has points the problem could be down to poor spark,the condenser could not giving a good spark.
the bike could be over fueling, could be a choke problem a carb float problem .

alligator wrestler, May 2008
link Click here to see other fixes for Yamaha.