that type of engine solely depends on the person on it. With the average man on it (180ib) or bigger than you are looking at 50-80 mph 180-190=70 -80mph for every 5 pounds bigger take away 5 pounds
Not very fast, possibly about 25 mph.
Not very fast at all because of all of the weight but the 150 pounds would almost even it out.
On a valve-in-block 8HP with an RJ19LM or equivalent plug, it is 0.030"
Briggs straitton
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.
10 15 mph depend on size of boat
Depends if you put it on an 8 foot skiff or a 40 foot barge.
Capacity is 36 ounces. I highly recommend you use Synthetic oil in this air cooled engine. Change it once each year.
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 ?
Some clubs and leagues that you may race in will have rules about engine size.