Quote:
Originally Posted by Sea18Craft
Bushwacker,
So I took your advice and checked the ignition system. Everything checked out so I can check that off the list. I replaced the primer bulb as well. Prepped her to take out this past Saturday Friday night, ran great at the house, dropped her in the water and now had a challenge starting her cold. Finally got her started after 4-5 cranks (choked) and she ran great. Went trolling for a few hours and went to Elliot for an hour and bamn had problems starting again. I'm thinking the carbs, any thoughts or suggestions? Thanks
|
A hot starting problem smells like ignition to me! Nothing much changes in the carbs when they get hot, although I suppose vapor lock could be a problem if you're running E-10 "Moonshine"gas, but that's unlikely! If you have a coil (either sensor coil or ignition coil) with cracks in the windings, it'll work fine when it's cold, but when it heats up, the coil expands, the cracks in the windings open up, and then the coil doesn't work!
I had an old '58 Johnson V-4 with a magneto system with a bad coil in it. It started fine when cold and would even run fine at high speed when hot because the magneto generated so much voltage at high speed that the cracks didn't matter! But as soon as you slowed down, the magneto output dropped, so it would quit and refuse to start till it cooled off! The guy who towed me back to the dock had a mid-60's Evinrude V-4 with conventional battery powered single coil & distributor/breaker point system, and said he was several miles offshore fishing in the gulf stream one day when his quit! They packed ice around the coil and got it going again and kept ice on it till they got back in!
So if you made up that spark checker, keep it on board, and use it the next time you run into a hot start problem to see if you're still getting a spark! Don't know much about Yamaha's, but if it's a 2-stroke V-6, I think they basically just copied the OMC design. It might still run (badly) if only one ignition coil is bad, but if it's either a bad sensor or charge coil in the stator assembly under the flywheel, you probably wouldn't see a spark on any cylinder. Maybe the ice bath treatment would help that!