i like these bikes
i saw non runner carb version up for grab in germany and got it for a very low price with only 23000 km
as you might imagine with that low mileage there is a catch
the exterior is very good but the carbs are well and truly bunged up
the guy selling it had a local old skool jap bike garage taken off the carbs and the butterfly's were solid with varnish
so i loaded the bike in my van and took it home ( 450 km ) and once home proceeded to strip the carbs ( did this on my nr 1 bb before )
indeed they are pretty c--p
using turpentine ( good for melting varnish ) i have cleaned most of the accessible parts and part cleaned the screw in jets( as best i can still leaving them to soak over night ) and the choke plungers and idle bypass screws
the butterfly's are now free and the body is clean and shiny
under the intake bell is a plastic plate with o ring type seal
under it is a series of brass stubs with holes
the outer ones there are 3 plus one blind hole that goes to a re-circulation valve two others i have opened up with a fine needle
on the inner two there are 4 in a staggered pattern
i am guessing that these are used to deliver a common vacuum to the other parts of the carb perhaps to actuate the slide?
i have managed to open up 3 of the 4 but there is one where the needle bottoms out ( maybe too fine a hole ?? )
so my question
what is the 4th one for? is it an issue if i cant un bung it ?
once the carbs have soaked overnight with the turps ill tbey clean them up and send them for a couple of hours of ultrasound cleaning
i did this on other less b---ered up carbs and they came out ok
with the ultrasound finish off what i started or is it a c--p shoot as to success , in which case i need to find a back up set ....
look forward to the oracles teaching me...