I then went to try and adjust the two throttle cable adjustment screws directly under the pump (as I had no adjustment off idle until over the halfway point on the throttle lever) and everything went downhill from there. Now it idles down so far (and the idle adjustment screw on the carb itself makes little to no difference) that you can hear every compression stroke, with a noticeable ping heard through the muffler on some of them when it went low enough, but always stayed running. Up in mid to high throttle it still surges, and I can even see a spark in the muffler some of the time it does so, almost like it's missing (brand new plug) on that stroke.
Ideas. Where to start... what to test? Mind you, I'm no slouch when it comes to engines and mechanics, and can even manipulate ECU maps on EFI cars (although my experience with adjustable carbs is limited), but this little 1-cylinder is becoming a PITA.
Oh... the springs are definitely not in the "right" position in comparison to the "factory" setup, but it undeniably works (to some extent). The spring is actually under tension in my photos, so if I unlock the lift arm, the spring would pull straight back on the mower lift arm, thus turning the lift arm pivot shaft counter-clockwise, forcing the lever forward and helping to lift the hitch.
I really think springs in pix are not right position at all. The big one is just pulling on the arm that mower chain lifts too, which is also wrong and just some extension someone put on there. Don't even see where that would give any leverage put on there. The later pix posted above are the more useful pull areas and make more sense. On that surging, try changing the car settings a little, maybe making slightly richer than you have now and see if it evens out. Other than the light Gov spring being stretched or in wrong holes on the linkages (might try diff holes too) the carb settings might help. If you look in a kohler manual, they may show the governors and diff postition changes of springs and such to get diff things to happen. I don't think any PK manuals will show those settings.
And adjusting the carb makes little difference, at least until the point that it goes too rich or lean and starts to stumble. It definitely has no bearing on the surging...
Edited by dzignr_tastz, May 04, 2015 - 09:09 PM.