I just bought a 2007 Mini Z 42" Kawa 19hp 56hrs (I spoke with you about it PJ, via email) Cut for the first time tonight and wow! Leaves a very clean even cut. Quite impressed. Where should the throttle be set when engaging the blades? The manual just says 'not full throttle.' Half throttle? Seems to LUG the engine down for a second pretty hard at anything below 3/4 throttle. How hard should the throttle lever be to move? Mine is quite stiff and takes a good bit of force to slide (choke also.) When both levers are forward it pulls to one side. I've checked the parts manual and there is nothing I could find about adjusting for that, only parking. Is there an adjustment for it? The hydros whine quite a bit, however I've never driven a ZTR before so I don't know what's normal. The previous owner had never so much as lifted the seat. The hydro oil was low in the overflow tank (but not empty) so I brought it up to the fill line. I've read on here that going with Amsoil 20w50 and new filters eliminates the whine.