On a valve-in-block 8HP with an RJ19LM or equivalent plug, it is 0.030"
Our Techumseh 8HP has a Champion J8C
I have an early 90's 2cyl, 8hp, 2-stroke and the gap is .040.
It is around a 5 hp. *this is incorrect: the ones they sell currently would be more in the 7.5-8hp range, seeing as an equally featured 190cc briggs and stratton engine is 6.75hp on a lawn mower the additional 15cc bump it up to around 8hp.
Capacity is 36 ounces. I highly recommend you use Synthetic oil in this air cooled engine. Change it once each year.
Briggs straitton
one reason for this is the air inlet on the petrol cap is blocked or too small causing a vacuum in the petrol tank and starving the motor.
First change the oil. Then before trying to start squirt someoil (about to table spoons) into the spark plug hole, replace plug and try starting.
There are two types, both on the camshaft. Lower HP (around 8HP or less) typically have a lobe with a bump on it that keeps a valve (often the exhaust) open at RPMS under 250, aiding in starting because the valve does not fully close) Larger engines have a counterweight on the cam that swings "up" at the same RPMs are "removes" the high spot achieving the same affect as above.
318cc. is 8hp. 305cc.is probably between a 6 to an 8hp.
Engines run by burning gas fumes- fire is hot- exhaust is therefore hot. Hot gases running through metal pipes will make the metal hot. Hence the reason for "Hot, do not touch" stickers on many small engine exhausts.
What year is the 8hp Mercury outboard with serial o6156590 ?
well first make sure that the gap between the armature and the flywheel is about .010" then if its properly set up the breaker points will open and close creating the necessary break in the current to allow a spark to be generated by the breaker points the gap should be about .020" on most modles but check the manual for your specific modles if they open and close at the right time then it will spark different modles use different methods but if they are hooked up right then the engine will fire on time