Quote:
Originally Posted by Proteus
Thanks, this is turning into much more of a project than I'd anticipated. Doing some more reading now.
I'm referring to the hole on the top, after removing the top covers and taking out the rubber boot. The one the needle under the spring sits in.
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Ah.. that's needle-jet. Smaller holes in jets underneath feeding it is even more important because they're source of fuel that mists up needle-jet. And even more important is fuel-circuits feeding those smaller jets. Here's what you gotta do:
You'll want to disassemble carbs down to individual components for thorough cleaning of each part:
Take apart emulsion tube into constituent parts: main jet, holder, needle jet collar. Note how needle-jet collar is oriented so you can re-assemble later same way. Unscrew pilot jet being careful to not lose spring, washer and O-ring. Might as well replace O-ring, float-bowl seals and float-valves.
Then use soft copper wire of various diameters to poke through all tiny bleed holes in all parts. Some people use guitar string to floss out secret passages in carburetor body. Blow compressed air through all circuits and verify you've got air coming out other end. Even better to soda-blast them.
If you can, use ultrasonic cleaner with 100% solution of KrudKutter for 12-hours. Thoroughly rinse with distilled water and dry. Don't get any cleaners on rubber diaphragm of slides. Measure and set float-levels when re-assembling. Set pilot-screws at 2.0-2.5 turns out. All this is perhaps maybe 30-40% of refurb job ducatiman does.
Here's good site for working on carbs:
http://www.vulcangadgets.com/files/keihin_carb.html
You'll also need to floss out hidden secrete passages with various gauges of copper wire, fishing-line, guitar strings.
Quote:
Originally Posted by n4mwd
Here are the secret passages in the carbs. They are kindof hard to figure out sometimes and this picture guide will show where they are for cleaning purposes.
Carb Pilot jet Circuit
Carb Main Jet Circuit
Carb Fuel and Overflow Drain
Carb Diaphragm Intake, upper choke and vacuum ports
Carb Choke Circuit
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Doesn't matter how clear holes are in your jets, if fuel's not reaching them, your carbs aren't working right.