On Sat, 18 Oct 2014 08:10:35 -0700 (PDT), noname
wrote:

This is driving me crazy. One of my snowthrower's tires has a _really_ slow leak. I've pumped it up to like 70lbs and put it under water and there are no bubbles. However, if I wait a few weeks sure enough the thing is losing air. Nothing like snowthrowing in 10 degree weather with one low tire pulling to the left, might work well for a Nascar track, not so much for a straight driveway :-) Any debugging ideas?
Today 90%+ of snow blower tires are tubeless. A leak around the stem
is VERY common. The rubber hardens with age, and the rim rusts. Pop
out the stem, clean up the rim around the hole, and install a new
stem. Leaking at the bead is also common. Break the bead (you need to
do this on at least one side to replace the stem anyway), clean the
bead with course sandbaler and coat with bead sealer.

I solved the problem for good ( for me) when I bought a track-drive
blower. Solved the problem with the friction drive slipping when it
gets wet too, when I bought that track-drive blower with Hydrostatic
drive!!