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With a HUGE THANKS & shoutout to Jonolove I have some carbs that are a way better than what I had. I'll be rebuilding them shortly, which I expect to solve my current carb problem. Also these are clean enough to answer my original question - There are 2 bypass holes on a SBN38 carb. I'm sure...

PM sent (I think, I'm not an expert on this site yet ;)

more pics

Ha, They were really nasty. I got 2 '98 SJ's from a buddy, if I get both running I get to keep 1, he gets the other. They were used in Saltwater then sat in my yard for 10 years (full of water), so the carbs were completely full of this white powdery corrosion. Both sets look like that...

Bump - I'm sure someone on this forum knows how many bypass holes there are in a Mikuni SBN38 ! I found 2 They are hard to count in the attached photo....

So did you clean out the bypass holes and how many were there? I am doing the same rebuild and only see 2 bypass holes (not counting the one on the engine side of the butterfly). I want to know if I am not seeing some bypass holes....seems important ;)

1) How many bypass holes on a SBN38? I am rebuilding some very corroded carbs on a stock Yamaha '98 dual carb superjet (SBN38's). I only see 2 bypass holes (plus the outlet on the engine side of the butterfly) but the corrosion could be hiding some. I would like to confirm there are only 2...

Is it really possible it left the factory this way? Has anyone else seen this? What do the little dots represent?

Hah, if you noticed I was also running it without the crank!. I just placed the cases back together for the picture. I have the engine all apart.

I consider myself a reasonable mechanic but new to Jetski's. I inherited a 1998 Yamaha Superjet 701, 62T cases, 61X cylinders and 64U head. I am the second owner, I believe the engine has never been apart. The ski sat in my yard unused since 2006, but used to run with no known issues. I am...