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
Super M, MV, H, HV	.020	.025	FP	1st Notch	1-3-4-2	.017H	.017H
M, MV, H, HV	.013	.025	FP	1st Notch	1-3-4-2	.017H	.017H
Super A, AV, C	.020	.025	FLY	DC 1-4	1-3-4-2	.014H	.014H
A, AV, B, BN, C	.020	.025	FLY	DC 1-4	1-3-4-2	.014H	.014H	For IHC magneto set points to .013, Wico magneto set to .015
154 Lo-Boy, Cub Lo-Boy, Farmall Cub	.020	.023	FP	TDC	1-3-4-2	.013C	.013C	For IHC magneto set points to .013, Wico magneto set to .015 - Int & Exh valve clearance for 154 Lo-Boy set to .015
Cub Cadet, 70 & 100	.020	.025	FLY	2 deg ATDC	1	.006C	.017C

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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