There is no need for any special
tools, divining rods, or magic chants. A simple cheapie dial caliper that
can do metric is enough. For the PD series "keyhole top" carbs the float
levels are 14.5mm (stock 77K PD-41A is 12.5 but for our rigs 14.5 works
fine), and 26mm for the earlier "round top" carbs. As long as the caliper
has the deptch gauge on the end you'll be fine. Actually anything with
a right angle that is the correct distance from the end to where it bends
over to touch the bottom of the float will work.
The carbs should set at an angle
where the floats just barely rest against the spring loaded pins of the
float valve needles but not leaning enough to where the weight of the float
compresses the springs any but no so little that the floats do not keep
the float valve needles seated. Above the floats are being set to 14.5mm
for the PD series carbs measuring from the bowl gasket face.
Above I've made a makeshift
stand so the earlier style carbs remian at the correct angle while setting
the floats. Each lobe should be 26mm which means you may have to twist
the float assembly just a bit so both lobes are even. Use a very small
flat screwdriver to bend the tabs resting against the float valve needles
one way or the other. DO NOT bend the arms the float lobes are fastened
to! If the floats are cockeyed in the least they could rub against the
casting or float bowl gaskets and you'll have a runaway puke tube. Levels
are measured in the same way as shown for the PD series except the measuring
tool rests on the edge of the slot on either side of the bowl gasket lip
(see below).
Here the notch you measure
float level from is highligted. It is incorrect to measure from the gasket
seat/face as some sources suggest or as how the PD series carbs are measured.
Houndog750 |
