Hi.i Need some help with with this motor.sn is 6240895.after water pump change I started the motor and idle is pretty high.noticed that there is no linkage between carburetor and throttle,only choke is hooked up to butterfly, and it stays wide open when advancing the spark/trigger lever.is this normal that carb butterfly stays in one(open) position at all times?.also....what is tune up procedure?i just acquired this engine and any help would be nice.thanx