Jacobsen 321 User Manual

Name: Jacobsen 321
Brand: Jacobsen
Rating: 5 (1 reviews)

103 pages

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Table of Contents3
Introduction6
Understanding Horsepower and Torque10
Horsepower, Speed and Torque in Engines20
Principles of Operation26
Jacobsen Engine Cross Section29
Ideal Fuel Mixture Requirements39
Carbon Build-Up39
Troubleshooting42
How to Start a 2-Cycle Engine42
Ignition System43
Compression43
Fuel System44
Crankcase Seals and Gaskets44
Exhaust Ports and Muffler45
Air Cleaner46
Foil Type Cleaner46
Paper Filter46
Piston and Rings47
Oil Bath Type Cleaner47
Foam Type47
Fuels and Lubricants48
Master Troubleshooting Chart49
Service Data52
Tolerances and Clearances52
RPM Settings53
Speed Settings Table53
Specifications54
Torque Data54
Special Tools55
Coil Test Data55
Condenser Test Data55
Magneto Test Data56
Test Instrument56
To Check Trigger Coils Early and Late Production57
To Check Charging Coil and Electronics Group57
Engine Overhaul60
Engine Teardown and Inspection60
Reed Adapter Inspection61
Flywheel61
Stator Assembly62
Baffle and Cylinder Head63
Piston and Rod Removal63
Crankcase Head Assembly68
Crankshaft Removal68
Carburetor Identification69
Carburetor Nomenclature69
Carburetor Inspection69
Carburetor Disassembly and Cleaning71
Float Bowl Housing Disassembly72
Main Metering Nozzle72
Fuel and Air Flow73
Cross Section of Walbro Carburetor74
Needle and Seat Inspection75
Carburetor Reassembly75
Float Adjustment76
Meter Nozzle Installation76
Magneto77
Stator Assembly Inspection78
Ignition Timing78
Point Setting79
Starter80
Tension Release of Rewind Spring81
Starter Rope Replacement81
Spring Installation82
Starter Reassembly82
Up and Away Starter Disassembly82
Final Engine Adjustments83
Up and Away Starter Reassembly and Spring Tensioning83
High-Speed Needle83
Idle Adjustment84
Choke Adjustments85
Engine Control Cable85
Cleaning and Storage88
Exploded Views and Parts List90

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Jacobsen 321 Specifications

General

Brand	Jacobsen
Model	321
Category	Engine
Language	English

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