Note: Boring the pilot jets
on the 77/78 CB750 carbs is only necessary if you intend to run freeflow
air cleaners such as a breadbox or pods, and if open headers such as drag
pipes are planned as well it's alomst mandatory. Here's a list of what
is needed:
1. WD-40 or other cutting oil
to help prevent bit binding.
2. Small bit chuck or older
X-acto knife with the crossed slots. I've also been told a pin vise will
work also.
3. A .45mm high speed jobber
bit. These bits are designed to be used on brass alloys and have a different
cutting pitch as well as flutes than a standard bit. I picked up mine through
KBC
Tool and Machinery for about 77 cents each, their part number: 1-091-0045
4. Small milk jug lid or
similar to hold the cutting oil so you can dip the bit in it between jets.
5. A piece of tape to hold
the jets at the edge of the bench and a piece of wood to clamp down on
them while you bore them out. The reason I do not use a vise is because
it is not difficult at all to distort the jets and evvectively ruin them.
It doesn't take much ot hold them in place while you bore them out. Of
course a couple of small bar clamps or C-clamps to clamp the wood down.
Before we get started, no
comments about my knarly greasy hands! I turn my own wrenches an it's just
something that happens when I do.
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