"There are two small brass scr
"There are two small brass screws. One is inside the carb at the bottom of the bowl. The other sits on top of the carb. They look like screws with square shoulders and slotted heads. And when you take them out they look like ... Carb Jets.
http://crc2onlinecatalog.com/images/MikuniJet.JPG
This is the one that's more like a doughnut. It's what you'll find down inside the float bowl. It's easy to find and it's easy to remove and to clean.
The one I missed on my carb looked more like this:
http://crc2onlinecatalog.com/images/MikIdleJetMechSmall01.JPG
And it was mounted on an air passage on the outside of the carb, up on top. Guys would look at such a thing and say: "that's the idle jet. You're idling fine." But the thing of it is that both jets are supposed to be functioning, giving all they have, when the throttle is open.
Remove these two pieces from the carb and clean them with wire, or replace them. Remove the pivot pin that holds in the float. and hold the little needles in the light. Look for fuel residue or anything that might block the passage of fuel.
Outboard motor techs really like getting a hundred an hour to troubleshoot engines. And they don't talk about what they do too much.
Motorcycles have more complex carbs than these that we are talking about here. And there are hundreds of articles out there on what carbs do and how to work on them. You might want to think about setting up the float hight again, or upsizing or downsizing the jets.
Carbs that sit and are partially blocked up inside can deliver a leaner mixture than you want. What do you know? you can burn a piston that way.
Looking at what sitting around undrained did to my carb, and how simular the two carbs are in over all design, and the way they both behaved the same way after the first cleaning. That's what makes me think that you've got blockage in that longer jet."
