Bum 398188 float valves?

[hanz63]

I feel like a high school kid at the bench. 3 in a row on 2 different carbs that the seats seemed too small and wouldn't fit snug in the bore. Leaked. The first one I gave up after 2 and put a Tecumseh seat in and tweaked the float to make it leaking. Did I just forget how???"

[bgsengine]

Bore for the viton seat is a stepped bore - seat drops in easy til the last bit to the bottom then its a very tight fit to press it in properly and difficult to get it started squarely - Briggs has guide driver tool they use to install those seats , I forget the tool part number..

[KE4AVB]

Or do as I do and use an invert drill bit slightly small than the seat OD and push the seat in making sure you install in the correct direction. As BGS said the hole is stepped right before the seat bottoms out.

So far I haven't seen of seats that did not fit but I tend to use after market seats and needle valves.

[hanz63]

I use the Tecumseh tool plus if I feel it needs an extra nudge, I have a shorter homemade brass one that I flip around push against the bench to ensure that it is in. My normal MO is to hit the seat with a quick spray of safe lube . After that failed, I cleaned / blew it out and tried again. Maybe the bore was too corroded to go all the way in, though level looked right.