Actually carb problems I believe. I have an older Ariens 6hp snowblower.
At first I could not get the thing started after not having been used in
quite some time. I disassembled the carb and cleaned everything out and got
it to run good. Adjusting the carb as taught in a small engine repair faq I
Anyway, what happens is the motor runs great for say 15min or so and then it
starts to surge. It will start to die, the govenor linkage moves, the
engine speeds up and then the process repeats. The first thing I noticed
when this happened that if I close the choke the engine speed will pick back
up. But obviously after the motor is warmed up I shouldn't need the
So I adjust the mixture screw on the bottom of the carb a little bit it
solves the problem for about 5 min. Then it will start to die again after
the 5 min. and I have to adjust that mixture screw again. I checked and the
screw is not turning on its own. After happening several times the screw
was almost adjusted all the way in when I finished my driveway today.
So what causes the mixture to lean itself out over time?