I bought a used ferris 1500z with a kawasaki 25 horse motor. When i bought it had already been cranked and warmed up. After getting it home I found out it is hard to get running. Put new plugs in, changed the oil and cleaned the air filter, it looked new. The plugs were in bad shape. When I start it, I put the throttle in the middle and turn the key. Will not start so I pull the choke and have to crank on it 5 or 6 times before it will start. It blows out a little smoke that I think is flood smoke. It runs fine after it starts, no smoke or miss at all. Is this normal for a cold start, should I put the throttle wide open and choke it? Thanks for any help.