jakesmurray
Well-Known Member
- Joined
- Jun 13, 2011
- Threads
- 65
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- 352
So this is the second Briggs flat head that I've had do this. This one is a 10.5 HP Model 28D707 Type 0123-01 Code 960716ZB. Upon a cold startup, it will run for about two minutes, then it starts spitting a gas and oil mixture into the intake from the breather tube coming out of the engine block. Once the engine is warm, it starts spitting immediately upon startup. Of course the engine will not run like this, as it chokes itself out. I set up a test using an empty oil bottle connected to the breather hose (see pic). The engine ran flawlessly while I drove the mower around the yard, as it was spitting into the bottle and not the intake and carb. I then poured the fluid into a clear bottle to see how much came out. The ride was about 2 minutes, and it filled the bottle with about 6 oz of fluid. That is excessive in my opinion. It shouldn't spit out any fluid, correct? So what causes this and how hard is the repair? It seems like a shame to have an engine running this well to basically get choked out by itself. By the way, I never did figure out the previous engine that did this, I ended up selling it as-is.