Just put an older 8hp Briggs together. Mainly just needed cleaned up, honed and a set of rings and lapped and set clearance on the valves. Valve seats appear good. Starts and runs great but has a real hard place in the cycle just as the piston passes TDC on the downward stroke (power stroke). It rips the starter cord out of my hand. Checked the valve clearance twice and ruled out anything else I can think of. I can feel the tight spot in the same spot of the cycle when it's pulled slow. Don't think it's a bent crank since it's fine on the other cycles. I did do a hillbilly plane on the head and block deck with a piece of granite and wet/dry paper but can't imagine removing enough surface to mess up the valve clearance.? Stumped
Bad backslap from recoil starter
- Thread starter greggw60
- Start date
Just put an older 8hp Briggs together. Mainly just needed cleaned up, honed and a set of rings and lapped and set clearance on the valves. Valve seats appear good. Starts and runs great but has a real hard place in the cycle just as the piston passes TDC on the downward stroke (power stroke). It rips the starter cord out of my hand. Checked the valve clearance twice and ruled out anything else I can think of. I can feel the tight spot in the same spot of the cycle when it's pulled slow. Don't think it's a bent crank since it's fine on the other cycles. I did do a hillbilly plane on the head and block deck with a piece of granite and wet/dry paper but can't imagine removing enough surface to mess up the valve clearance.? Stumped
Let's start with the engine model and type numbers so we can see which engine you've got.
BS 8hp 195414 1137 01
Yep. Horizontal. All been checked and rechecked. Starts right off and runs and accelerates smoothly. Just has that really tight spot I can't figure out. Pulled the rope till it got hard to pull and pulled the head off to see where it was sticking. Rolls over smooth with no compression
S/B 195412. I/C series
Geez. That was a lot of pull
Hammermechanicman
Lawn Addict
You can remove the spark plug and turn enging slowly by hand to check for any nechanical interference. If no i interference and valve lash is good probably a decompression issue.