Posted by ScottyHOMEy on April 30, 2008 at 19:21:36 from (70.105.254.22):
Apologies up front for this bein' so long. I'm vexed at this point.
My BN's actin' up. I rebuilt the motor several years ago and went to some pains to keep her lubed over the interim. Once I got her painted and all the parts back on, she ran and moved just fine.
Timing is good. she starts well on the crank or the starter. Governor has new spring and thrust bearing. So between that and her runnin' right from the start, I'm reasonably confident of the mechanicals, including the little that can be done with the carb.
Over the winter I'd open the garage door and run her every few weeks with some paper over the grill to help her heat up good each time. Started and ran right all through that period.
After a couple parades and a show last summer and fall, I never had occasion to actually move the old girl again until last week. She ran like a top on the level ground, but goin' up the hill to the neighbor's brushpile burnin' party, she'd falter/stumble. Sounded and felt like a fuel problem. Backfired once. Coming home that same night, same thing. Downhill riding against the governor was no problem, the flats were no problem, but accelerating was the same faltering.
I've had a look inside the tank with my handy mirror. Nothing but gray metal to be seen. Outlet to the sediment bowl is clear. Sediment bowl is good. The screen at the elbow into the carb is clean.
First troubleshooting runs since then, she ran ragged at startup, but came out of it as she warmed up (after five minutes or better of running ragged), though I haven't yet tested that under load.
I noticed condensation on the tractor early in the winter (before this problem emerged) and so dumped some dry gas in and ran her for a while the next day before filling her with gas treated with StaBil.
So . . . . many paragraphs later, is my question. In runnin' the tractor in the garage (doors and windows open) the exhaust has that old gas, mothball smell. I've had some trouble with water even in fresh gas brought home in cans for the garden tractor on snow-throwin' duty. Am I dealin' with bad/wet gas? Am I dealin' with gas that doesn't store well? (Either would be a bummer, because all the gas around here comes from the Irving refinery in Saint John, NB, no gettin' around it.) Is it possible that filling the tank as I did washed down old varnish that had dried on the walls of the otherwise clean tank? Is it something I can burn through and get past the problem?
I apologize again for the length of this, but I'm about out of ideas and will welcome any you may have.
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