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I must have thought I was replying to a different thread with my SHO question....

This sure sounds like a TPS/link n synch related issue. I didn't see a compression check on your list, when was...

Thermostats are pretty easy to test if you have a cooking thermometer or otherwise compatible with hot water. Hang them from a wire in a pot of water and warm up the water slowly watching the temp...

In my engine's case, the pin loosened up and receded into the upper ring land (loose tooth)...eventually, the ring walked past and hung in a port. Two other pistons had pins loose enough to remove...

I certainly wouldn't do it unless it was to get me by in some sort of extraordinary circumstance... and then it would be very temporary.

Find the cause for overheat and fix it.

Do SHO have the shift-interrupt switch? If so, possibly that???

Have you seen many HPDI's with damaged pistons but top ring/locating pin is intact and ring has not walked?

This is absolutely correct and the appropriate clearance for anything other than an OEM piston is info that is not easy to come by. Wiseco makes a fine piston but my research indicated that proper...

What is the condition of your thermostats? What temperature do they run on a SHO?

I was going to say head gasket or cracked head, but often the plugs in affected cylinder will be steam cleaned and I doubt that would overheat an outboard anyway since it's not a closed cooling...

The temp sensor is on top of the block, so that should set off the horn if you're overheating just the upper cylinders. At what point did the horn go off? I've idled around unknowingly with a stuck...

What became of the injectors from the blown powerhead? Did they get tested/cleaned? From the looks of the piston, I'd guess the injector may not have been salvageable?

A lean running cylinder...

Water pressure is above what Yamaha says should be minimum, so overheating, or getting close to when a horn goes off, seems unlikely.

I misread his post about number 8, but do follow the torque sequence marks on the cover. A lot of times, yamaha will also cast the torque value into the part.

Can someone help me on another clarification? My understanding is the bottom 2 cylinders typically run hottest, not the top 2? The exhaust runs from top to bottom of engine...it makes sense that...

I read the other thread and think you received good input from the prop guys. It doesn't sound like a problem due to warm/humid air. You'll also need to pay attention to things like amount of time...

That's the cylinder head cover bolt. The number 8 means it's the 8th in order of torquing. You should torque them in sequence per the number adjacent to the bolt. It's also a 2 stage torque. ...

That's a nice looking lock. How does it prevent the nut from backing off if the thrust washer wears or moves up on the prop shaft?

If the throttle position sensor voltage was changing intermittently, that could be the cause. I don't know what the threshold is for the engine to set a code due to TPS voltage....if no code, then I...

I'll never see Garfield the same way again...

I found this thread a couple years back where Chris Carson and a fellow named Jim were talking about bypassing the swtich. You can look at posts 32 & 37.

Maybe Chris will chime in on how he does...

This happened to me at a national event on Dardanelle Arkansas....the engine on my boat was borrowed but had my prop on it (in case I hit something). There was no damage when I swapped props back...

The primer bulb that's usually under the deck lid for the bilge....on some boats it's outside in the splashwell. If you get a vacuum leak on one of the joints, it may stop pulling fuel to the...

I've heard of that one too but can't recall why it works.

Did you pump the bulb?

Sounds like good news. Good luck and let us know what happens.