97 speedster smoke then stall

[Swampwrench]

Hi all. I just got my 97 speedster in the water after replacing a rotary valve shaft in the starboard motor. Everything went great for about 2 hours of constant use at varying throttle levels. We tied up to a dock and hung out for about 45 minutes then started up again. The motor was smoking...bad. I throttled up to see if the smoke thinned out and it seemed like it did. Ran the boat for about 10 minutes then slowed to idle. Still smoking. At idle speed the motor stalled and would not start up again. I checked the plugs and they were fouled. I put a set of fresh plugs in and it still wouldn't start. Limped in on one motor and went home. My plan for troubleshooting is this:
1) Check compression
2) Check spark
3) Pull rotary cover and check rotary valve
4) Pull head cover and look inside

I figure that to smoke like that, it's gotta be getting oil into the cylinders from below, right? The oil pumps are blocked off and I'm premixing. I've ruled out wrong mixture since the boat ran great for a couple of hours. Thoughts/suggestions appreciated!

 

[timmyboy76]

inner seals, leak'n?

 

[Swampwrench]

the culprit

I just removed the rotary cover and the rotary shaft brass gear appears to be gone again. It rotates around to the top and just stays there. This is what I just got fixed. Man I'm pissed. Is there any way to fix this other than pulling the motor out and breaking it all the way down? 2 hours on the water...

 

[timmyboy76]

Swamp, you replaced the gear or entire assy. If just the gear, than i say, the shaft is bent. If/any time, a brass gear goes, it best to replace entire assy...sorry bud, 2hrs...:ack:

 

[Swampwrench]

What would you do?

The whole assembly was replaced. But not by me. I found a guy on Craigslist to help troubleshoot my previous problem and he did it while I was out of town. I figured it was the best way to have a lakeworthy boat when I got home. I'm sick over this. When I went to pick up the boat, I noticed right away that there was a nut missing from the exhaust flange where it meets the exhaust manifold. Then the dudes son casually mentions that when they took the boat to the lake to test it, it filled up with exhaust smoke... he had (oops) forgotten to tighten one of the exhaust clamps. No big deal, right? Today when I took the airbox off, there are 2 screws missing from the airbox assembly that holds the grate over the flame arrestor. These are all small miscues that are leading me to believe maybe this dude has a lack of attention to detail. For what I've spent on this fix (100 bucks part and 400 labor), I'm 3/4 way to a rebuilt from SBT. I called the dude and he isn't exactly leaping to take any personal responsibility for the situation. Unbelievable.:rant: