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Greetings all! New Yamaha (previously Tohatsu) owner here! I picked up a cherry (see pics.) 2007 25 short shaft/pull start. Still had all the paint on the prop, and skeg. I've been running it for about three weeks, regularly, and it's absolutely one of the nicest running engines I've ever had. A little cold natured, but a one pull runner after the first fire up. Today I was running down the river, and it just shut down. No Misfires, no ****iness, no loss of power, nothing weird to note. Luckily a group of decent dudes towed us the five miles up river to our rig and we got home fine.
I tore into it immediately and checked everything, starting with compression. Dead even 120/120 on each cylinder (I don't believe this engine was ever broken in, it's come up 30PSI evenly on both cylinders since I bought it.) Pulled the plugs, zero spark on either. Both pulsers, the charging coil, and the lighting coil all ohm out properly, as do both of the ignition coils. I don't have a DVA, but I've got a snap on meter that holds min/max and has a graph. It's difficult to watch the meter and pull the cord at the same time, but the appearance on the graph is that everything is working properly. Is it common for one of these CDI/powerpacks to fail without warning on such a young engine? They're 350$ and I'd like to eliminate any possibility of buying one and it not being the culprit. I pulled the flywheel, everything under it looked flawless. No broken magnets, or weird chafing. The keyway, and top of the crank are perfect. Any guidance or advise is greatly appreciated! Thanks, all!
I tore into it immediately and checked everything, starting with compression. Dead even 120/120 on each cylinder (I don't believe this engine was ever broken in, it's come up 30PSI evenly on both cylinders since I bought it.) Pulled the plugs, zero spark on either. Both pulsers, the charging coil, and the lighting coil all ohm out properly, as do both of the ignition coils. I don't have a DVA, but I've got a snap on meter that holds min/max and has a graph. It's difficult to watch the meter and pull the cord at the same time, but the appearance on the graph is that everything is working properly. Is it common for one of these CDI/powerpacks to fail without warning on such a young engine? They're 350$ and I'd like to eliminate any possibility of buying one and it not being the culprit. I pulled the flywheel, everything under it looked flawless. No broken magnets, or weird chafing. The keyway, and top of the crank are perfect. Any guidance or advise is greatly appreciated! Thanks, all!
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