Specifications

ii
Contents
General Safety Precautions .............................................................................................................................. 1-2
Locating and Reading Engine Model and Specification .................................................................................... 3-5
Quick Reference for Spec. Numbers-To-Model Designation ............................................................................. 6-7
TORQUE SPECIFICATIONS
2-Cycle ............................................................................................................................................................8
4-Cycle ...................................................................................................................................................... 9-10
TROUBLESHOOTING
2-Cycle
Fuel System ............................................................................................................................................11
Ignition System .......................................................................................................................................12
4-Cycle
Fuel System ............................................................................................................................................13
Ignition System .......................................................................................................................................14
CARBURETORS AND GOVERNORS
2-Cycle
Diaphragm-Dual Adjustment. ..................................................................................................................15
Diaphragm-Single Adjustment. ...............................................................................................................15
TC/TM Governor Adjustment ..................................................................................................................16
Walbro (WTA, WT) and Tillotson (HU) Diaphragm Adjustment ..............................................................17
Carburetor Pre-Set and Adjustment .......................................................................................................17
Final Idle Mixture Adjustment .................................................................................................................17
Emissionized Tillotson ............................................................................................................................17
Emissionized TC/Tillotson Carburetor ....................................................................................................18
Emissions Carburetor Idle Mixture Adjustment Procedures ...................................................................18
TC/TM Emissionized Tecumseh Carburetor ...........................................................................................18
2-Cycle Engine Speed and Governor Adjustments: TVS/TVXL840 .......................................................19
HSK/HXL840-870/TH139 .......................................................................................................................19
Governors and Linkage for Air Vane ................................................................................................. 19-20
4-Cycle
Static Governor Adjustment ....................................................................................................................21
Governor Shaft Pressed in Depth ...........................................................................................................22
Small Frame, Vertical and Horizontal .....................................................................................................23
VLV40, 50, 55, 60, 65, 66 .......................................................................................................................23
Retainerless Governor System for Small Frames ..................................................................................23
Medium Frame Vertical ...........................................................................................................................23
OV195 ....................................................................................................................................................23
Medium Frame Horizontal ......................................................................................................................24
OVM120, OVXL120, 125 - OHV11-17 - OV358 - OV490 .......................................................................24
OHM120 - OHSK80-130 - OH318 - OH358 ...........................................................................................24
OH120,140,160,180 ...............................................................................................................................24
OH195 / OHH .........................................................................................................................................25
TVT / VTX / OV691 .................................................................................................................................25
Engine Speed and Mixture Adjustments ................................................................................................26
Mixture Adjustment Procedure for Adjustable Carburetors .....................................................................27
Common Engine Speed Controls and Governor Linkages ............................................................... 28-29
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