19
JETT QJ-1 ENGINE
The fuel line included with this kit is suitable for the fuel
lines from the fuel tank to the needle valve and from the
fuel tank to the muffl er, but thin-wall fuel tubing from
Darrol Cady or Sullivan is preferred for the line from the
needle valve to the engine because it will be easier for the
fuel cut wire to pinch for stopping the engine.
❏
1. Form the fuel cut wire before mounting the engine:
NOTE:
Forming the loop on the fuel cut wire is somewhat
of an art that takes a little practice—if your fi rst attempt
at making the loop is unsuccessful using the wire that
comes with this kit, make a new wire from K&S .031"
music wire. The method illustrated below uses a 3/16"
[4.8mm] brass tube for making the loop, but round-nose
pliers could also be used to make the loop.
❏
A. Use 400-grit sandpaper to scuff 2" – 3" [50 – 75mm] of
one end of the wire and clean off any residue or oxidation.
❏
B. Wrap the cleaned end of the wire four or fi ve times
around a 3/16" [4.8mm] tube or rod—the coils will get
tighter with each wrap until the I.D. of the last coil is
about the same as the tube.
❏
C. Cut off the extra coils so only the last, tightest coil
remains.
❏
D. Use pliers to bend and manipulate the coil until it
will slip through the hole in the back plate mount and
your fuel tubing will pass through.
❏
E. Use silver solder to permanently close the
loop. Use steel wool to thoroughly clean any residual
soldering fl ux from the wire, then apply a fi ne coat of oil
so the wire won’t rust. Set the fuel cut wire aside.
❏
2. Run a 6-32 tap down through the blind nuts in the
fi rewall to clean up any epoxy leftover from the fi llet inside.
If the tap won’t go through, drill out the obstruction with a
#36 (or 7/64" [2.8mm]) drill, then run the tap.
❏
3. Temporarily fasten the back plate mount to the
fi rewall as shown with four 6-32 x 5/8" [16mm] SHCS.
Hook Up the Fuel Cut Wire
❏
1. Mark the center of the hole in the back plate mount
onto the fi rewall for the guide tube for the fuel cut wire.
Drill a 1/16" [1.6mm] pilot hole through the fi rewall at the
mark, then enlarge the hole with a 1/8" [3.2mm] drill.
