1978 John Deere Spitfire 340 Snowmobile Service Manual
This manual provides comprehensive repair information for the 1978 John Deere Spitfire 340 Snowmobile, including engine specifications, fuel system, and electrical diagnostics. Part number: TM1191.
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Sample pages from the 1978 John Deere Spitfire 340 Snowmobile Service Manual manual
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John Deere Models Covered & Key Technical Specifications
Models: John Deere Spitfire 340
Sub-models / Variants: J34AG, J34AH, J34AJ
Build Years: 1978–1980
Serial Numbers: J34AG 080001M, JD34AH 095001M, J34AJ 120001M
Technical Data:
- Engine Displacement: 338 cc
- Engine Type: Two-stroke, air-cooled, two-cylinder
- Compression Ratio: 6.9:1
- Ignition Type: Capacitor Discharge (CDI)
- Lighting Coil Output: 12-Volt, 120 Watt
- Fuel Mix Ratio: 50:1
- Fuel Tank Capacity: 5.75 U.S. Gal (21.7 L)
- Track Width: 15 in.
John Deere Manual Features & Content Preview
1978–1980 John Deere Spitfire 340 Snowmobile Technical Scope
- Covers 1978–1980 John Deere Spitfire 340 snowmobile configurations, including the J34AG, J34AH, and J34AJ variants.
- Official John Deere technical publication TM-1191, July 1979 revision.
- Contains 48 exploded-view diagrams, 4 technical specification tables, and 12 electrical wiring schematics.
- Delivered as a direct download the moment payment clears.
- Permanent availability in your purchase account — no re-buy required.
- Print resolution preserves exploded-view detail.
- Indexed PDF search covers every chapter and appendix.
- This 1979 edition serves as the factory reference for the John Deere Spitfire 340, documenting specifications and maintenance parameters for both Kohler and John Deere Fireburst engine variants.
Component and System Documentation
The 1978–1980 John Deere Spitfire 340 technical manual provides detailed assembly and inspection data for the power train, including the Comet 94C drive sheave, driven sheave, and mechanical disk brake systems. The document segments the snowmobile into six primary groups: General, Engine, Fuel System, Electrical System, Power Train, and Suspension. For engine service, the manual documents the Kohler K340-2FA and the John Deere Fireburst TB340A, detailing cylinder bore tolerances, crankshaft runout limits, and piston ring end gap requirements.
Specification Highlights
Engine compression for the John Deere Spitfire 340 is documented at 110–130 psi (758–890 kPa). Connecting rod side clearance for the engine is specified at 0.0157–0.0197 inches. Magneto pick-up coil resistance for the electrical system is 160–200 ohms in the primary charging coils. The manual includes comprehensive altitude charts for the Mikuni carburetor settings across multiple temperature ranges. Stator screw torque for the engine assembly is listed at 5 ft-lbs (6.8 Nm). An official 145-page John Deere OEM technical manual covering the 1978–1980 John Deere Spitfire 340, documenting engine, drivetrain, electrical, and fuel-system specifications for the K340 and TB340 series engines.
Reference only — always consult a certified technician before performing service on this equipment.
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