Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Sloe to engage the starter, but once starter engages, it will start the engine? Do you have a voltmeter to test the starter solenoid? Sounds like the key is not getting the voltage to the starter solenoid, or the solenoid is slow to engage. I would replace the starter solenoid/relay, parts where the positive battery cable attaches.
I see question is still open, did you see my response?