This data has been gathered from old out-of-print material. While we make every effort to be accurate, the information shown is to be used for general reference only. It is always best to have the original service or operator's manual for your tractor before attempting any tuneup.

There is a legend at the bottom of the page describing some of the terms used here.

Model	Point Gap	Spark Plug Gap	Timing Mark On	Spark Occurs	Firing Order	Int. Valve Clearance	Exh. Valve Clearance	Comments
VA Series	.020	.025	FLY		1-3-4-2	.014C	.014C	Point gap for Magneto set to .015
V Series	.020	.025	FLY	DC	1-3-4-2	.014C	.014C	Point gap set Splitdorf at .015, Fairbanks at .020
S Series	.010	.025	FLY	HOLE	1-3-4-2	.010C	.010C
R Series	.015	.030	FLY	DC 1	1-3-4-2	.010C	.012C
LA Series	.015	.030	FLY	D	1-3-4-2	.018C	.018C
C & L Series	.015	.025	FLY	D	1-3-4-2	.018C	.018C
D Series	.010	.025	FLY	D	1-3-4-2	.018C	.018C

Legend
TDC - Top Dead Center FP - Crankshaft Fan Drive Pulley Exh - Exhaust Int - Intake ATDC - After Top Dead Center BTDC - Before Top Dead Center
Data collected from an old Niehoff tune-up chart.

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