Briggs & Stratton Quantum 120000 engine 6.5 HP stall?

Also check the bowl bolt. The jets feed through the center of this bolt, there is a tiny hole in the center, that feed from two more holes near the base of the bolt head. I'm having a similar issue at this time and just found that hole was plugged. I used a small jet drill to clear it. Here's hoping.........

Ozzie
October 2009

The brass jet on the bottom center of the carburator float bowl has become clogged with sediment. when you take it off a bread tie wire & come carburator cleaner are all you need to clean the jet. Take care when putting on the bowl as the sealing gasket (large o-ring) must seal perfectly otherwise the primer bulb will squirt fuel out of the bowl instead of priming the carb venturi. a 5/16", 3/8" & a 1/2" socket (& ratchet) carburator cleaner & bread tie or garbage bag tie wire are all you need to complete the repair. It helps if you drain the gas tank before you begin. Or you can just pinch off the line with a vice grip. Quantum engines are some of the best & are one of my personal favorites. Good luck !

Jimbosjunkpile (youtube screen name)
September 2009

Quantum engines don't have diaphragms......

Dran the float bowl - it's possible that a drop of water has found it's way in, blocking the jet. While the bowl is off, check that there is a decent flow of fuel.

These engines are prone to breaking the inlet pipe that runs across the top of the cylinder from the carb to the inlet port. This will cause similar symptoms of it is cracked.

phil_saunders(a)bigfoot.com

Phil Saunders
September 2009

Replace the gasket that separates the carburettor from the fuel tank...its in 2 parts - the diaphragm part fits next to the tank, the gasket bit is on the carb side.

John
September 2009