Re: 75 25HP won't start - backfires
Wires can be backwards to piontsets, but its easy to test, just swap the connectors on coilwires, and see if it fires right. The 22 cid are very fine, runs smoother and quiter than the later ones, but with less torque. If the prop is too large for the 20 I think it is for the 25 too, the 25 puts its power out at 1000 rpm more than the 20, you can see it on the label on the steering bracket. Do a sparktest, it will tell you a lot. If it fires fine, seal the cracked coil with silicone. If ignition is fine, sync'n linck ok and carb clean, they run very very fine.
Wires can be backwards to piontsets, but its easy to test, just swap the connectors on coilwires, and see if it fires right. The 22 cid are very fine, runs smoother and quiter than the later ones, but with less torque. If the prop is too large for the 20 I think it is for the 25 too, the 25 puts its power out at 1000 rpm more than the 20, you can see it on the label on the steering bracket. Do a sparktest, it will tell you a lot. If it fires fine, seal the cracked coil with silicone. If ignition is fine, sync'n linck ok and carb clean, they run very very fine.
