Finn Lassen wrote:

Ok, I'm back to jetting my carbs and final engine runs before taking the
plane to the airport for assembly.

At 1000 - 1200 RPM I am getting 20 in Hg MAP. Is that normal or should I
look for air leaks (false air) before drilling up the idle (slow) and
main jets?

The engine runs rough if I don't apply near full choke and starts
missing at 2000 RPM with prop load (higher RPM w/o load). This with only
one of the three carbs - the center carb supplying both rotors.

Finn

Paul wrote:

What kind of carbs do you have on there Finn?

Why are you using only the center carb?

Do you have an EGT gauge on there?

What does the intake manifold look like?

Paul Lamar

 Finn Lassen wrote:

I have three Mikuni carbs from a '79 Yamaha XS1100 bike. The manifold 1/2" of
the original manifold with three 1.75" tubes welded onto it. Very close to
Teracy Crooks original set-up.

Yes, I do have two EGT sensors and the stock O2 sensor (which only works
intermittently).

It's easier to jet one carb at a time (or at least the center carb and then
the outer two carbs).

I just got an answer back from Tracy. He believes I'm running lean and just
need to start drilling the jets up.

My main point was that if my MAP is way off it could indicate some air leaks,
which I would have to fix before starting to drill up the jets.

Finn

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