I've got an old Toro CCR [3horse?] that was showing signs of carb
problems last year so I rebuilt it last week.
The carb is a diaphragm type on a Tecumseh HSK600-1680s.[replacement
carb is 640086A - the only numbers on this one are '744 9BS']
I knocked out the 2 welch plugs and soaked the carb overnight in carb
Cleaned the plastic needle- it looked fine.
Cleaned gas tank [plastic] and replaced gasoline.
After the rebuild I started it up and it ran ok at factory- warmed it
up, adjusted to what sounded real good. . . and waited for snow.
That was only a week ago, but today I couldn't keep it running. Primed
it, and it started fine- but it acted like it wasn't pumping gas. As
soon as the primed gas ran out, it died. Tried adjusting the carb
back to factory- but it wouldn't stay running for more than about 30
seconds. I repeated it often enough to warm the thing up, but it
still won't stay running.
I'll play with it more tomorrow- but I'm wondering if someone has run
across this before.
Because it doesn't seem to be pumping, my first thought is that I put
the diaphragm in wrong, but then why did it run so well last week?