There is only the idle mixture screw to adjust and that isn't enough to turn the exhaust red. If possible, see if the original carburetor is available, you may now have a cheap Chinese one. Since there is a stumble after full warmup it may indeed be lean. Spark plug readings to determine fuel mixture should be done after a long, hard run and an immediate shutdown, looking at plugs that may have idled a while or was not worked hard will not be useful. Also wondering if there's anything else I should be looking for or concerned about. Any input from the group would be greatly appreciated. I'm planning on using it to clear snow this winter, but just want to make sure it's running correctly. I absolutely love this machine as it came with snowblower attachment and cab. Not too concerned about it for the time being. Was just a little low on fluid when I got it but may not have been checked for many years. Nothing on the floor after about a week, Just an oily film. Also looks like my left axle seal may be leaking. Do people still use glycol or are they putting in anti freeze. I thought I'd replace all fluids since I really don't know much about the history of machine. Replacing coolant is not listed on maintenance schedule. Operators manual says to use permanent ethylene glycol mix. Another question I have is about coolant. So far I've drained tank and new gas and added a little sea foam. Replaced plugs, changed engine and transmission oil. Apparently rather than replacing a bad part on old carb he just got a new one. Maybe it's not adjusted right, not sure at this point. It's my understanding that previous owner replaced carb. Was wondering if I'm running lean or is this how they normally run.There is a slight stumble at full throttle after it warms up. Old plugs were a light brown and both looked the same. One thing I'm seeing that I didn't notice at first is that when looking sideways into muffler shroud I can see that the muffler is getting red hot. Has liquid cooled Kawasaki with 219 hours. New to the group and bought my first wheel horse about a week ago.

Daihatsu dm950g carburetor