this problem just started out of nowhere. ran fine the day before. i have an srm 2100 runs strong and great for 5 minutes or until it is heated up to running temp. then it just acts like i throw the choke on and it bogs out. i can restart it usually, but itwill rev up for 2 sec then start bogging out again. i replaced the spark plug andthe primer bulb since it was cracked, but i still have the same problems.