Does any one know anything about the new four mix engines? I picked up a new KM 130 R combi tool with a few attachments a while back. It seems well built and is very handy. The only thing that I don't like about it is that it will not rev. It runs ok, sounds wierd, well I'm used to high strung two cycle engines. The salesman said it had better torque than a two cycle because the fuel burned all the way to the bottom of the cylinder rather than blowing out the exhaust half way down like the two cycles do. I't does seem to have real good torque at about five thousand RPM. I haven't put a tach on it to be sure but that is about all it will rev. I've seen forty year old Clintons rev better than this will. Is there anything that will make it run better ? Or is this what we must settle for in the future chain saws ? Maybe in twenty years we will be amazed at where the four stroke technology has gone, like the two cycles have since the forty year old Clinton. That is no comparison to my modded 346XP s. The Clinton did have gobs of torque.
I know this is an old post but I just purchased a KM 130 R.
This is a different engine for sure, but it's still just a 4 stroke and should work/rev as such. My problem was perhaps uniquely different in that my new tool ran like crap from day one on the top end and a constant stumble off idle with a shudder in the mid range. After 2 hours run time and one quick look at that spark plug told me this thing was chocking on fuel, which charcoal everywhere you look at the plug is never a good thing. You guys told me this has a rev limiter and that is exactly what I hear on the top end! This engine has so much power that it's hard to load it. I have the weed wacker/string trimmer and the cultivator attachments thus far and under wide open throttle it sounds fat/rich but it's actually ignition cut that is causing that sound, (aka) rev limiter. The constant hesitation I was dealing with required a 1 and a half clockwise turn on the "L" adjustment. Now it zing zings and also, it now runs much like a garden tractor where choke on equals put put put (still running) while choke off equals zing zing or brhaaap brhaaap.
I got the tools to adjust these ZAMA carbs and it is quite a special tool. But my concern is that I now have a strong running machine but I had to lean it out by 1 and half turns? It's all but brand new and I should not have to do a damn thing!
I pulled the spark arrestor and that made a world of difference right off the bat, so I knew I was heading in the right direction by leaning things out. Even still or STHIL, I should not have to deal with this crap. The STIHL adjustments from factory where either done on Monday or,,,, set up to run 2000 ft "below" sea level if that's even possible..... Either-way there is no way this engine needs that much fuel,,,,,right? But self lubricated by fuel and then I just took a whole bunch of fuel away, how does that work internally for the moving pieces and parts? Less fuel equals less oil, so is it rich for a reason? Well, my 130 power head runs nice now and soon I'll be ditching the paper air filter for a sponge bath version. In the mean-time can someone tell me for absolute certain if this 4-mix engine can run like any other 4 cycle engine or if it needs more fuel for the sake of it's own integrity?
Thanks,