Small Engines (Lawn Mowers, etc.): more power, throttle plate, mechanical governor


Question
QUESTION: Just purchased and installed a new B&S 215702-0015-G1 10.5 HP 344cc POWERBUILT engine on my older JD 68 Rider. The motors top rpm seems too low. Is there a way to adjust Governor or linkage for higher RPM and Power

ANSWER: Paul

was this engine the correct replacement for the application? How did you go about finding out the replacement engine,not all engines with the same horse power are used on the same equipment. Most mower manufactures have specifics form there equipment. Let me know more about this and then I can help you. What was the old engine Model #?

---------- FOLLOW-UP ----------

QUESTION: 195707-4519-E1

Answer
Paul
According to Briggs the

Replacement Engine:
217907-0019
Crankshaft Number:
495629
Crankshaft
Trim: ALL:
Top No-Load Speed: 3400

Get a tachometer and see if the RPM'S are close to 3400
The engine that you have replaced it with 215702-0015-G1 is similar to the recommended one. You can adjust the Governor

The following procedure eliminates play in a mechanical governor between the governor crank (the arm that protrudes from the crankcase) and governor system components inside the crankcase. This procedure does not apply if your engine has a pneumatic governor.

Loosen the clamp bolt on the governor crank until the governor lever moves freely.

Move the throttle plate linkage until the throttle plate is wide open. (To find the wide-open position, first position the throttle lever against the idle speed screw or a fixed stop plate. The throttle is wide open when it is all the way in the opposite direction.) Note the governor arm's direction of rotation as you move the throttle plate to the wide-open position. This is important for the next step.

With the throttle plate wide open, use a nut driver or wrench to turn the governor shaft in the same direction that the governor arm traveled.

Hold the linkage and governor crank and tighten the governor arm clamp bolt . Move the linkage manually to make sure there is no binding.