Poor boy's $20 method...if you don't just change the seals, but 3000fps advise is right on.
Get a blood pressure bulb from EBay for cheap, it has check valves built in.
Then get a Husky spark plug air inlet adapter #503844002, also cheap but the shipping sucks.
Add a plastic NAPA auto emmissions tee & a 20# low pressure guage to the rig.
Blind the muff & intake ports with sections of old "wedge shape cut" inner tube & slip it in, then tighten the screws back down.
Hook into the adapter with spare saw fuel line & pump it up four or five times to 8# & blast the intake & seals with Windex or dish soap mix. It will take away any doubts you have!
Faster than repeatedly working over a carb that is probably fine. I've never had crank seals that hold pressure, but don't hold vacuum, but others have stated they did...
Get a blood pressure bulb from EBay for cheap, it has check valves built in.
Then get a Husky spark plug air inlet adapter #503844002, also cheap but the shipping sucks.
Add a plastic NAPA auto emmissions tee & a 20# low pressure guage to the rig.
Blind the muff & intake ports with sections of old "wedge shape cut" inner tube & slip it in, then tighten the screws back down.
Hook into the adapter with spare saw fuel line & pump it up four or five times to 8# & blast the intake & seals with Windex or dish soap mix. It will take away any doubts you have!
Faster than repeatedly working over a carb that is probably fine. I've never had crank seals that hold pressure, but don't hold vacuum, but others have stated they did...