Your best bet is to invest in a manual.To check the choke on your carb is a good chore.But easy after you have the pics to do it. I think Your carb is different from what NCscrambler is thinking(if it is like the one on my 425)You have to pull the tank and take the diaphram off the top of the carb and lift the choke to half choke,inspect the air bleed hole.Loosen thelocknut on the choke and turn the adjusting screw in or out until choke plunger iss half way in the hole(half the hole is covered),put the choke all the way on(the hole should be all the way open),turn choke off and check for a small amount of free playat the lever before the plunger starts to move.Thighten up lock nut and put diaphram back together and everything else back on.

 

Oops, thanks Ftwflh for keeping an eye on me, I just copied and pasted... My fault. do like Ftwflh tells you. Later