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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
TO-20, 30	.020	.025	FLY	TDC	1-3-4-2	.014H	.014H
MF 65,85,88,90 (Gas)	.022	.026	FLY	5 deg BTDC	1-3-4-2	.016H	.018H	Spark for MF65 is 6 deg BTC
MF 35, TO-35, MF-50, MH-50	.022	.025	FLY	5 deg BTDC	1-3-4-2	.013H	.013H
MH Pacer(16), Pony	.020	.025	FLY	4 deg BTDC	1-3-4-2	.012C	.013C	For spark, Pony set at paint line
MH Colt(21), Mustang(23)	.020	.025	FLY	TDC	1-3-4-2	.014H	.014H

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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