Any theories on what might be killing the voltage regulator (or maybe some other part of the 5v supply circuit)?
Sounds like both of these died sitting in storage over the off season (?) so it probably wouldn't be the obvious usual suspects like heat or over voltage or hooked battery up...
That makes perfect sense. Probably could even make it work with an external 5v power supply to the right pin on the ribbon cable. Wouldn't really want to do that though.
I mean....I know it's probably not what you want to hear, but I'm pretty sure when Yamaha sold it from the dealership brand new and completely stock it started and ran. If it doesn't start and run with everything stock something is wrong.
When you say stock everything, do you mean this is a stock motor in a stock ski (something that came stock with a 760)? If so, why not run stock jetting?
If you have this in some halfway normal stand up setup with dual carbs you're probably WAY rich on your high speed. You'll probably end up in...
I don't have any experience with an 1100, I can only go by my experience with smaller motors that had noticeable gains by changing to a curve with more advance at low rpm and less at high rpm compared to the stock curve, as a zeel or a total loss msd is typically set up.
Actually I don't even...
It would not surprise me if the cylinder was decked slightly which is what is causing the tight squish and high compression. It would also not surprise me if the shapes of the ports in the sleeves are all wrong (seems to be a thing on sbt motors) so you might have very low port timing which...
To give credit where it's due, I think @Sparkplug gives good advice on starters in this thread:
https://www.x-h2o.com/threads/oem-starter-rebuild-kits.205129/#post-2108523
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