official site for Briggs and Stratton Spark Plugs is: http://www.briggsandstratton.com/maint_repair/routine_maintenance/choosing_spark_plugs/
The proper spark plug will depend on the type of 6.5 HP motor that you have. Briggs and Stratton made several different ones and the best way to get the proper plug will be to call an authorized Briggs and Stratton repair shop with the mower make and model numbers.
50:1
50:1
model # is year made last two didgets
1 pint of oil to 6 gallons of gas, or 50 to one. Same thing
The maximum speed of the 1976 Fiat 131 4cyl 65hp is 78 mph.
65hp
90 mph was the maximum speed of ford cortina 4cyl 65HP 1967.
The maximum speed of a 1962 simca 5 4cyl 65HP is 65mph or 104kph.
My 75 Johnson is 50:1. If you use a synthetic oil you won't need to worry about it and no more smoke from too much oil
Gas/Oil Mix = 50:1
if im not mistaking it was around 90mph/ 120km
The 58HP version had a top speed of 76 mph (122.3 kph).