I have a Sears 42" riding mower with a 16HP Briggs & Stratton engine. Last fall it threw a rod and the engine is not repairable. I have gotten a 14.5 HP Briggs & Stratton engine and am in the process of replacing the 16HP engine. Unfortunately the guy I had look at the mower when it first broke down removed and tore down the engine, but did not put it back together or back on the mower (not that I expected him to). He simply put all the parts in a box and gave it to me. I can't get in touch with him now (he's gone out of business) so can't go to him with my question. The 14.5 engine is an older model, although I am not sure how old. I'll add both model numbers below so if you need them they'll be there. It seems to fit okay, although I am having to make some minor mods (such as the muffler which will not fit right on my frame). However, I am not certain of the wiring and since I did not remove the old engine I can't compare that. The 14.5 engine has four wires on it (two sets of two wires each with plugs on the ends). There is a black and white set. The white wire attaches to something under the carb (looks like an electronic part), there is also a black wire attached to this part which is grounded to the block. The black wire coming from the plug seems to run up past the card and up under the cover (perhaps to the flywheel area). The second wire set is on the other side of the engine. It has a red and black wire which run up under the cover. The other end has a plug and there is a slight bulge in the red wire just before the plug which I understand is a diode (I think). There are four wires coming from my key switch. There is a red & orange set and a black & blue set. They both end with plugs. If I connect the plugs up just as they are wired (male to female) I end up with: 1) red & orange plug from the key attached to the red & black plug from the engine 2) blue & black plug from the ket attached to the black & white plug from the engine. There is also a thick red cable which I assume goes to the starter. Before I hook this up and give it a try, I wanted to see if anyone could tell me if this was the correct way it should be wired. Don't want to fry the electrical system. Anyone have any thoughts? The old engine is a B&S 16HP model 311700 type 0132 E1 code 990910ZE The repl. engine is a B&S 14.5HP model 287707 type 0227 01 code 9412224B Thanks for any help.