Hi folks , need advice on my 2001 72" Lazer Z with the fuel injected kohler . For the last couple of weeks , it's been starting fine the first time , and then will not start to go back on the trailer after using the machines in front of it . I replaced the oxygen sensor , blasted the plugs ,it has spark and fuel , 150 PSI compression in both holes , 925 hours . Is there something easy that goes out to cause this ? If you crank it over until the battery's almost dead at full throttle , it might start . Using my battery booster pack starts it sometimes , but not today .