MTD 78 Series - Frequently Used Specifications

Introduction
15
Frequently used specifications
Minimum Maximum
in. mm in. mm
Intake valve lash
78 0.004 0.10 0.006 0.15
83 0.004 0.10 0.006 0.15
90 0.004 0.10 0.006 0.15
Exhaust valve lash
78 0.006 0.15 0.008 0.20
83 0.006 0.15 0.008 0.20
90 0.006 0.15 0.008 0.20
Spark plug gap
78 0.026 0.65 0.030 0.75
83 0.026 0.65 0.030 0.75
90 0.026 0.65 0.030 0.75
Module air gap
78 0.016 0.40 0.024 0.60
83 0.016 0.40 0.024 0.60
90 0.016 0.40 0.024 0.60
Displacement
78 16.9 cid (277 cc)
83 21.8 cid (357 cc)
90 25.6 cid (420 cc)
Governed engine RPM
78 3500 + 100
83 3500 + 100
90 3500 + 100
Oil capacity
78 37 oz 1.1 L
83 37 oz 1.1 L
90 37 oz 1.1 L
Fuel tank capacity
78 1.3 gal 5.0 L
83 1.3 gal 5.0 L
90 1.3 gal 5.0 L