changed engines from a 13.0 tecumseh to a 17.0 tecumseh and had to change the wiring harness, getting no fire at the spark plug, cleaned and adjusted the magneto, how can I check to see if I have the wiring correct??

reuben Lawson, June 2011

The only part of the wiring that will make the engine not run is the kill wire. Just disconnect it (it will be a single wire coming out from under the cowling). With a meter on the now disconnected harness wire, check that there is open circuit to ground with the switch in 'RUN' or 'START', and a short to ground with the switch at 'STOP'. If that checks out, crank the engine and check for spark. If none, you have a duff coil.

phil_saunders(a)bigfoot.com

Phil Saunders, June 2011