Mick,
The cork seals work for a few years, if everything is perfect. I got
new "jet bearing kits" #WZX1593, for my H6 carbs, from Burlen. All new
seals, corks, brass & copper washers, cupped washers, springs, about a a
zillion parts. As you probably know the cupped brass washers have to go
the correct way toward the corks, the corks need to be presoaked in oil,
& the outside of the jet needs to be polished perfectly smooth. If it is
at all rough or uneven it will leak or wear the corks quickly. If in
doubt, new jets might be a good idea but even the new ones need to be
smoothed up. The jet locking nut & sealing cork & it's cupped aluminum
washer need to be carefully assembled & fully tightened, after centering
the jet, without damaging the cork.
I just got some "super" synthetic cork seal replacements from a friend.
they are supposed to be installed with two to replace each single cork.
The look like white nylon Orings & fit too tightly around the jet
outside, in my estimation, to allow the jet return springs to work.
Maybe with gasoline lubrication, something magic happens. Haven't tried
them yet. Too much work for a possibly unsuccessful experiment. I'm
going to wait to hear from someone else about whether they work or not.
I know regular Viton Orings cause too much friction on the jet & don't
let it return properly. Not easy to find a low friction, gas tight,
sliding fit seal. Cork isn't too bad compared to other materials.
The jet adjusting nut should be turned clockwise (unscrewed) as viewed
from the top side of the carb to make the mixture richer. Haynes must
have been viewing it from the bottom side. In any event, unscrewing the
nut makes the jet tube longer so that the jet stops at a lower, richer
position.
Good luck,
Dave Russell
Longbridge BN2
Mick VanderPloeg wrote:
> While trying to adjust the mixture on my H4 carbs, fuel started dripping from
> the jet adjusting nut. I assume the cork sealing ring is shot (again). These
> were just replaced a few months ago. Is there an alternative to these cork
> rings, or some other way to prolong their lives?
>
> Also, it seemed that I could never get the mixture rich enough by turning the
> adjusting nut. The engine would always slow down when I lifted up on the
> piston. The only way I could get it correct is by using the choke arm to pull
> the jet downward. The Haynes manual states that the jet adjusting nut should
> be turned counter-clockwise (when looking down at the carburetor) to increase
> the richness of the mixture. Is this correct? It didn't seem to do a thing
> for me.
>
> Thanks,
>
> Mick Vander Ploeg
> '57 BN4
|