by bgsengine » Fri Aug 27, 2021 3:47 pm
Yep, diaphragm goes tank side, gasket against the carburetor. Make sure your spring is in there correctly (sits on the nub on carburetor and centers on diaphragm) , make sure you do not overtighten the screws (causes warp) , use a straightedge on top of tank, verify less than .002 or less out of flat on carb mounting surface (if it is more, there's a repair kit, if I recall part number 391413, or you need a new tank) also sometimes doubling up on the gasket (use an old one in good condition, perhaps) helps with minor variations in warpage (close look at new gasket after carb has been mounted can show traces of where carb seats less securely, or not seating at all) Also carburetor mounting screws torque sequence is not your typical crossing pattern - you start with the screw closest to center (closest to the throttle lever) and torque in sequence counter-clockwise.. proper torque is , I believe 15 - 20 inch pounds (which feels "barely tight" doing it by hand.. just past "snug")
If it runs on prime and not after priming, likely have a problem in jetting or nozzle, or an air leak (always use new o-ring where it mounts to crossover pipe, always check crossover pipe - they are notorious for coming loose and to a lesser extent, cracking or breaking)
How poor are they who have not patience. What wound did ever heal, but by degrees? - Iago (Othello Act II, Scene 3)