Try cleaning the muffler cleaning the carburetor and decarbonizing the engine by disconnecting the PCV hose and running the engine untill it warms up. Run the engine at wide open throttle and trickle two gallons of water down with the air filter off. What this does is builds up a LOT of steam and blows carbon out like magic. Hope this helps!
Briggs straitton
Surging is often fixed by replacing the fuel filter. A simple job and most small engine shops will have the part.
The spark plug gap for an 8HP Tecumseh engine using a J-8 spark plug is typically set at 0.030 inches (0.76 mm). It's important to regularly check and adjust the gap to ensure optimal engine performance and efficient ignition. Always refer to the specific engine manual for the most accurate specifications.
To adjust an 8hp Tecumseh carburetor, start by ensuring the engine is warm and at idle. Locate the adjustment screws: the idle speed screw controls the engine's idle RPM, while the mixture screw adjusts the air-fuel ratio. Turn the mixture screw slowly in (clockwise) until the engine starts to sputter, then back it out (counterclockwise) until it runs smoothly. Finally, adjust the idle speed screw to achieve the desired RPM while ensuring the engine runs smoothly without stalling.
Our Techumseh 8HP has a Champion J8C
318cc. is 8hp. 305cc.is probably between a 6 to an 8hp.
What year is the 8hp Mercury outboard with serial o6156590 ?
On a valve-in-block 8HP with an RJ19LM or equivalent plug, it is 0.030"
I have an early 90's 2cyl, 8hp, 2-stroke and the gap is .040.
some sites say 1952 ,others say 54, and that model# is a 7.5 not an 8hp
8hp-14hp
backfire is the best! rubbish! loosers L