I have this old WW Grinder brush chipper with an 8 HP Tecumseh engine.
For 10 years at least it has been reliable and started every year the
one or two times I used it.
This year, couldn't get it to even cough much less turn over. Verified
spark, replaced plug (which looked OK anyway). Dropped a bit of gas
into the air intake and it popped so I pulled a few more times and it
ran for a few seconds. So it is capable of running if it gets gas.
Now of course let's cut to the chase it was probably water in the gas.
So I'm going to drain the system.
Nevertheless I disassembled the fuel/air intake system and need to
understand how one brings the thing back to life with all of the
settings out of whack.
The gas intake goes down to a cup with a float valve in it. There is
an adjustable screw in the middle of the nut which holds this cup on
that appears to regulate the flow of gas into the cup from the gas
line. How do I adjust this?
There is another adjustable screw on the body of the part, this appears
to be a needle valve. I presume this is the idle setting?
There's another screw that stops the travel of a cam that is operated
via a wire that goes off to another part of the engine, my assumption
is that this sets the high speed RPM limit? The cam has the letter "F"
stamped on it.
Finally there is the choke lever but I do understand what that does.
There's a bit of corrosion on some of these pieces, what's the best way
to get that off?