I have a Craftsman push mower with a 6.75 MRS Briggs and Stratton engine. I picked it up cheap, because it was not running. I put a new carb and gaskets and it will only start with starting fluid. Once started, it runs fine. Primer bulb looks good, even tried primer from another mower, but will only start with starting fluid. Any
thing I am missing? engine # is 125k02-0253-e1
#2
StarTech
The question is "Is the Primer actually working?". These primer bases are bad to warp especially if over tighten.
You might check to see if the intake nipple on the back of the air filters housing (that bolts to the carb) is clean. I picked up an old mower like this that was clogged there. Gave me fits trying to figure out what was going on.
Got a new base, will still not prime. Shoot a little air from the air compressor thru the hole in the primer bulb and that primes it, not sure what to do next.
Take a look at the impression on the gasket. Then make up a wedge gasket using two gaskets applying extra pressure in area on non contact in the primer path area. Do this only if you are allow to use sharp tools as it requires a back bone razor blade or hobby knife. A little wood helps to the two gaskets in place until they bonded. Place the wedge partial gasket away from the air cleaner base so you get a tight seal and only tighten the screws to where the primer works around 35 in-lbs.
After I learned to do this I still got the same primer base that I brought new 9 yrs ago in the parts bin.
