I initially posted on the SNAPPER forum, But I would like some help from B&S engine experts.
Snapper Model 7800928 with a Briggs and Stratton engine Model No. t5vVTHXN - - - My grandson was mowing the grass for me while I was not home. My daughter was in the front yard and heard a loud "BANG" like a gunshot in the backyard. She ran around to the backyard to see that my grandson was okay. My grandson said the engine started running rough and then the bang happened and the engine stopped. They smelled gas, so they put away the push mower and started using the riding mower. When I checked it out a couple of months later, I determined that it had a good spark, that the crankshaft is not bent, that the air filter is clean and that the shear pin is good. I had to use some starting fluid to crank it and it ran rough for about five minutes until I cut it off. I cleaned the carburetor and reinstalled it, but the mower still ran rough. So, I decided to replace the carburetor and purchased an Chinese knock-of from AMAZON and when I installed it the engine hydrolocked. I returned it to AMAZON and purchased a Briggs & Stratton 591137 Carburetor (Replaces 590948) from AMAZON last Nov. I installed it and the mower still ran rough for a few minutes until I cut it off.. Now spring is here and I decided to check out the mower. I pulled the rope a few times and nothing happened so I checked the gas and found that the tank was empty. I put about a quarter of a tank of gas in the mower and pulled the rope and the engine was already hydrolocked. I removed the carburetor and inspected the needle and seat and the float and everything looks good and is clean. It seems that it would take more than just a poorly seated needle and seat valve to hydrolock the engine in less than a minute. I reinstalled the carburetor and put some gas in the tank and let the mower sit for a four hours and then pulled the rope several times. The engine would not start, but it was not hydrolocked. I waited about two minutes and pulled the rope and the engine was hydrolocked again. Am I doing something wrong? What could cause two new carburetors to hydrolock the engine?
Any insight would be greatly appreciated. THANKS!!
Snapper Model 7800928 with a Briggs and Stratton engine Model No. t5vVTHXN - - - My grandson was mowing the grass for me while I was not home. My daughter was in the front yard and heard a loud "BANG" like a gunshot in the backyard. She ran around to the backyard to see that my grandson was okay. My grandson said the engine started running rough and then the bang happened and the engine stopped. They smelled gas, so they put away the push mower and started using the riding mower. When I checked it out a couple of months later, I determined that it had a good spark, that the crankshaft is not bent, that the air filter is clean and that the shear pin is good. I had to use some starting fluid to crank it and it ran rough for about five minutes until I cut it off. I cleaned the carburetor and reinstalled it, but the mower still ran rough. So, I decided to replace the carburetor and purchased an Chinese knock-of from AMAZON and when I installed it the engine hydrolocked. I returned it to AMAZON and purchased a Briggs & Stratton 591137 Carburetor (Replaces 590948) from AMAZON last Nov. I installed it and the mower still ran rough for a few minutes until I cut it off.. Now spring is here and I decided to check out the mower. I pulled the rope a few times and nothing happened so I checked the gas and found that the tank was empty. I put about a quarter of a tank of gas in the mower and pulled the rope and the engine was already hydrolocked. I removed the carburetor and inspected the needle and seat and the float and everything looks good and is clean. It seems that it would take more than just a poorly seated needle and seat valve to hydrolock the engine in less than a minute. I reinstalled the carburetor and put some gas in the tank and let the mower sit for a four hours and then pulled the rope several times. The engine would not start, but it was not hydrolocked. I waited about two minutes and pulled the rope and the engine was hydrolocked again. Am I doing something wrong? What could cause two new carburetors to hydrolock the engine?
Any insight would be greatly appreciated. THANKS!!
