Hi, Engine model not specified, but I gather it to be a 28 cu. in. engine. Idle is done with a tachometer and should be 1800 RPM +/- 50. The mixture is generally only adjustable on the low speed circuit thanks to the EPA. Idle speed adjusted above the venturi with a Phillips/slotted screwdriver. Low speed mixture screw is near the intake manifold, usually at a 45 degree angle and having a limiter cap (unless removed.) Adjust idle after engine has warmed five minutes at full throttle. Then adjust mixture for maximum speed, if available(may seem to have little effect or no effect if limiter installed. Accellerate to full speed and use hand on linkage to manually bring to idle. Engine should accellerate smoothly when released if correct. No CO meter required. Peace, crigby
48oz
190cc
what plug size fits a 3.75 briggs and stratton,and a 19.5 briggs engine and what is the gap. thank you
It is a 2-cycle 4HP Briggs motor.
SAE30
9
A Briggs and Stratton 17.5 horsepower engine can use any type of small engine motor oil. A heavy duty motor oil is recommended.
For a Briggs and Stratton motor 3.5 motor used straight gas and oil in the crank-case, there is no ratio.
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.
7.75 HP
13.6