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Leaky Airscrews
Posted: Sun Dec 04, 2011 1:40 pm
by headcoats
Pulling LC apart for the winter fettle and noticed that my airscrews are leaking premix
Anyone else have this problem ?
They are KR 28mm PWK carbs
Runs fine and had best dyno result to date a few months back
I have a Mikuni 42mm carb on me Buell
and i noticed that the airscrew on that has a little 0 ring on it
Posted: Sun Dec 04, 2011 6:59 pm
by JanBros
just an alergic reaction from those Yamaha-parts, nothing you can do about it really ...
on topic : there is no O-ring, it is not nescessary, as the airscrew is on the intake-side, and only air passes.
Posted: Sun Dec 04, 2011 7:09 pm
by headcoats
Is it because they can't handle the 61BHP
Posted: Sun Dec 04, 2011 7:19 pm
by dave32
Persnoally ive never heard of them leaking before,is the screw wound out 2 turns or more?
Might be worth adding a couple of turns PTFE tape to the thread if they have to be out more than 1 and 1/2 turns.
Posted: Sun Dec 04, 2011 7:50 pm
by headcoats
They are at 1 1/2 turns out
Maybe the carbs are spitting back a bit
Posted: Mon Dec 05, 2011 2:52 pm
by dave32
Are you running open carbs then?
if your using a filter(foam or S and B type) then spitting back shouldnt get past on to the carb.
Ive just fitted a set on my 350 and am running foam ramair filters,havent road tested yet but feels promising.
Posted: Mon Dec 05, 2011 3:14 pm
by headcoats
Running Ramairs on little extension tubes
I'm thinking the unburnt fuel oil mixture is settling in the bellmouth area then running down into the little hole where the airsrew screw/needle is