So, I just recently finished a stage 1 Predator for my Simplex. Problem is that it stumbles when I try to cruise half-throttle, or so. It idles great and runs full throttle great. It's just the mid-range that ain't acting right. It never dies fully, just acts like it's skipping.
I set it up almost exactly like another one that I have that runs great all the way through the RPM range.
Standard (non-Hemi) Predator
governor intact
Air filter kit
140 emulsion tube
36 main jet
disabled low oil sensor
Autolite Racing plug
"Box Stock" shorty header with mini RVL silencer
I have switched back and forth through different combinations of stock emulsion tube and 140 tube and jets of 36 and 37. None of this seems to matter except it seems to do a little better with the stock emulsion tube. I'm thinking maybe it's the "box stock" header that might be the issue because the other engine has a typical 1" diameter header and this "box stock" header is only 3/4" outside diameter.
Where would you start when trying to fix this thing?
I set it up almost exactly like another one that I have that runs great all the way through the RPM range.
Standard (non-Hemi) Predator
governor intact
Air filter kit
140 emulsion tube
36 main jet
disabled low oil sensor
Autolite Racing plug
"Box Stock" shorty header with mini RVL silencer
I have switched back and forth through different combinations of stock emulsion tube and 140 tube and jets of 36 and 37. None of this seems to matter except it seems to do a little better with the stock emulsion tube. I'm thinking maybe it's the "box stock" header that might be the issue because the other engine has a typical 1" diameter header and this "box stock" header is only 3/4" outside diameter.
Where would you start when trying to fix this thing?