My 01 YZ426 is hard to start cold. I have to go through several rounds of kicking it with the choke in and out before it will run steadily. Usually it goes like this: pull choke out, kick a few times,push choke in and it will start, run and stall. Go through this a few more times and it will remain running. (Always starts first kick when hot and runs great otherwise. Have tried starting with no choke when dead cold, but no luck) Thanks.