it has to crank way too long to start,once it warms up it fires up just touching the key,but after cool down it goes back to long crank time,i am moving the throttle up a little but it doesant seem to help on cold start,and when it finally fires it runs crappy for 15 seconds,do these things have chokes ? yes i am priming the bulb.can anyone explain thier cold start proceedure so i can match it to mine.