How do I find TDC & how to set timing (camshaft/crankshaft), and how to set the Governor. Craftsman Lawn Tractor, Model 917.257573; Briggs & Stratton 15 HP Motor;
Model #28N707; Type 012101

 

Henry,

We need to know what engine you are working on by way of posting ALL model, type/spec numbers.....

 

Remove the spark plug(s) and valve cover(s).

Identify the intake and exhaust valves.

You need to be approximately 1/4" past TDC on the compression stroke. Slowly rotate the flywheel clockwise until you see the intake valve close. Insert a probe (like a screw driver, pencil or other long straight object) into the spark plug hole, then continue to rotate the flywheel clockwise as the probe is pushed out of the spark plug hole, you will be able to tell when the piston reaches TDC as the probe will stop moving. Apply a little pressure to the probe and rotate the flywheel clockwise, stop when the probe sinks back into the spark plug hole 1/4", if you go a little further that's alright.

This is the position to use to set the valve clearances.

For settings click on the Check Chart link at this site.

http://faqs.custhelp.com/cgi-bin/faq...i=&p_topview=1