Segment:
Entry-level to mid-range trail riding snowmobile.
Target Audience:
Recreational riders, families, and those seeking a reliable and user-friendly snowmobile experience.
Key Competitors:
Models from Ski-Doo (e.g., Safari), Arctic Cat (e.g., Jag), and Polaris (e.g., Indy) from the same era.
Engine Configuration:
Lightweight and responsive fan-cooled, 2-stroke, twin-cylinder engine.
Handling Characteristics:
Known for its nimble handling and ease of maneuverability on trails.
Reliability:
Yamaha's reputation for robust engineering contributes to its perceived reliability.
Engine Service:
Detailed disassembly, assembly, inspection, and adjustment procedures for the 337cc engine.
Fuel System:
Carburetor tuning, fuel pump operation, fuel tank and line maintenance.
Ignition System:
CDI ignition system diagnosis, spark plug specifications, timing adjustments.
Cooling System:
Air cooling system maintenance and airflow management.
Lubrication System:
Oil injection system, lubrication points, oil specifications.
Drive System:
Clutch (primary and secondary) inspection, adjustment, and replacement; drive chain maintenance and tensioning.
Suspension System:
Front and rear suspension component inspection, lubrication, and shock absorber service.
Braking System:
Hydraulic brake system maintenance, caliper service, brake pad replacement, and bleeding procedures.
Steering System:
Handlebar, steering post, and ski alignment inspection and adjustment.
Electrical System:
Wiring diagrams, lighting system service, battery maintenance, starter system troubleshooting.
Track System:
Track inspection for wear and damage, idler wheel and bogie wheel maintenance.
Routine Maintenance:
Pre-ride checks, post-ride cleaning, lubrication schedule, belt inspection.
Engine Overhaul:
Complete engine rebuild procedures, including piston, cylinder, and crankshaft service.
Carburetor Rebuild:
Step-by-step instructions for disassembling, cleaning, and reassembling Mikuni carburetors.
Clutch Adjustment:
Detailed procedures for adjusting primary and secondary clutch engagement and backshift.
Troubleshooting Guides:
Diagnostic charts for common starting problems, power loss, and unusual noises.
Electrical Diagnostics:
Fault finding for ignition, lighting, and starting circuits using multimeter readings.
Suspension Repair:
Replacement of bushings, bearings, and shock absorber seals.
Track Tension Adjustment:
Correct procedures for setting track tension to prevent damage and ensure optimal performance.
Diagnostic Capabilities:
Advanced diagnostics for engine performance issues, electrical faults, and drive system anomalies.
Component Rebuild:
Comprehensive guides for rebuilding major powertrain components like the engine, transmission (clutches), and carburetor.
Specification Data:
Includes critical torque values, clearances, fluid types, and electrical resistance specifications.
Special Tool Requirements:
Highlights necessary special tools for specific repair and maintenance procedures.
Cooling Method:
Fan-cooled
Bore X Stroke:
64.0 mm x 54.0 mm (typical, verify with manual)
Compression Ratio:
6.7:1 (typical, verify with manual)
Horsepower Output:
Approximately 28-32 hp (verify with manual)
Torque Output:
Not typically specified in horsepower-focused marketing, but detailed in service manual.
Carburetor Type:
Mikuni VM34 (twin carburetors, typical)
Fuel Type:
Unleaded gasoline (87 octane minimum recommended)
Oil Mixture:
Pre-mix or Oil Injection System (verify specific model, manual will detail operation).
Length:
Approx. 102 inches (verify with manual)
Width:
Approx. 39 inches (verify with manual)
Height:
Approx. 42 inches (verify with manual)
Dry Weight:
Approx. 360 lbs (verify with manual)
Fuel Capacity:
Approx. 6.0 US gallons (verify with manual)
Oil Capacity:
If oil injected, capacity for oil tank (verify with manual).
Crash Test Data:
Snowmobiles of this era did not undergo standardized crash testing like automobiles.
Braking System:
Hydraulic disc brake, rear.
Throttle Limiter:
Not typically standard, but possible aftermarket or specific model variation.
Kill Switch:
Engine stop switch located on the handlebars.
Hand Warmers:
Standard feature for rider comfort and safety in cold conditions.
Headlight Taillight:
Essential lighting for visibility and signaling.
Oil Change Interval:
If oil injected, regular checks and top-offs of the oil reservoir. Verify specific interval for oil filter if applicable (unlikely for 2-stroke injection pump).
Spark Plug Replacement:
Recommended every 1,000-2,000 miles or annually, depending on usage (verify with manual).
Clutch Inspection:
Inspect primary and secondary clutch sheaves, rollers, and springs at the beginning of each season and periodically thereafter.
Drive Belt Inspection:
Inspect for wear, cracks, and proper tension at regular intervals, replacing as needed. Recommended replacement mileage varies significantly with usage.
Coolant Type:
N/A (Fan-cooled engine)
Brake Fluid:
DOT 3 or DOT 4 brake fluid (verify with manual).
2-Stroke Oil:
Yamaha recommends their specific 2-stroke injection oil, or an equivalent API-TC, JASO FD certified synthetic blend oil.
Clutch Wear:
Sheave wear and roller degradation can lead to poor performance and belt slippage.
Carburetor Icing:
Can occur in very cold, humid conditions, leading to rough running or stalling.
Exhaust Gasket Leaks:
Can cause performance loss and excessive noise.
Track Tension Issues:
Improper tension can lead to excessive wear on the track and drive components.
Company Origin:
Yamaha Motor Corporation, established in 1955, with roots in musical instrument manufacturing.
Automotive Division:
Yamaha has a long history in powersports, including motorcycles, ATVs, and snowmobiles.
Enticer Lineup:
The Enticer name was used for a series of Yamaha snowmobiles, with the ET340 being a significant model in its class.
Production Era:
The ET340 was primarily produced in the late 1970s and early 1980s.
Manufacturing Location:
Typically manufactured in Japan or North America by Yamaha.
