I have a Wheel Horse ZTR 616-Z with an Onan P216V / 10873A engine that has intermittent and weak spark. Onan Coil # 166-0761 tests open on the secondary circuit. Here are my questions:

1. How can the engine run with a coil that tests open in the secondary circuit?

2. Onan coil # 166-0761 is no longer available and has been superseded w/ Onan coil - 541-0522 which costs over about $110.00. Has anyone use this replacement coil with excellent results? Do you know of any other type of coil that may work better then the original?

Thanks!

Andy