Ted shuffled out of his cave and grunted these great (and sometimes not
so great) words of knowledge:
There should be a set screw in the side of the needle valve and a hole
in the end of the needle valve. Loosen the set screw, bend a piece of
1/16" music wire into an "L" shape, cut to length needed, insert in hole
and tighten set screw.
On the off chance you have an "older" engine that does not have the set
screw, do the following:
1. Get a piece of brass/copper tube that will just fit over the outside
of the needle valve.
2. Cut the tube to the length needed.
3. Remove the needle valve from the engine and remove the O-ring on the
needle valve.
4. THOROUGHLY CLEAN THE KNURLED END OF THE NEEDLE VALVE WITH ACETONE.
5. Put the piece of tube over the end of the needle valve and CRIMP
WITH A PAIR OF PLIERS ONTO THE KNURLED PART.
6. Apply flux and solder the tube to the end of the needle valve.
7. When everything has cooled, clean the needle valve, put the O-ring
back on the needle valve and crimp the other end flat.
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