The Echo CS-702 is a classic chainsaw model that has been a reliable workhorse for loggers and homeowners since its introduction in 1975. This two-stroke gasoline engine chainsaw features a powerful 70.7cc engine with a chrome-plated aluminum cylinder bore and piston ported intake method. Its centrifugal clutch and direct drive type provide excellent cutting performance, and the anti-vibration handlebar system makes it comfortable to use for extended periods.
The CS-702 also features a mechanical chain brake, automatic oil pump, and automatic rewind starter, making it a versatile and easy-to-use tool for any cutting task.
Specifications
| Specifications | Value |
|---|---|
| Manufacturer | ECHO (KIORITZ CORPORATION) |
| Series or Assembly Number | CS-702, CS-702VL, CS-702EVL |
| Year Introduced | 1975 |
| Year Discontinued | N/A |
| Engine Displacement | 4.32 cu. in. (70.7 cc) |
| Number of Cylinders | Air cooled, two-stroke, single cylinder gasoline engine |
| Cylinder Bore | 1.97 in. (50 mm) |
| Piston Stroke | 1.42 in. (36 mm) |
| Piston Ring Thickness | 2 rings used |
| Cylinder Type | Aluminum with chrome plated bore |
| Intake Method | Piston ported |
| Manufacturer Advertised H.P. | N/A |
| Weight | 16.5 lbs. (7.5 kg) powerhead only |
| Handlebar System | Anti-vibration |
| Chain Brake | Mechanical |
| Clutch | Centrifugal, 3 metal shoes |
| Drive Type | Direct |
| Construction | Die cast Magnesium |
| Magneto Type | Flywheel magneto with breaker points |
| Carburetor | Tillotson HS-166A |
| Major Repair Kit | RK-23HS |
| Minor Repair Kit | DG-5HS/T |
| Air Filter System | Nylon mesh element |
| Starter Type | Automatic rewind |
| Oil Pump | Automatic |
| Maximum Engine RPM | N/A |
| Idle RPM | N/A |
| Ignition Timing | 30 degrees before TDC |
| Breaker Point Setting | 0.012 to 0.016 in. (0.30 to 0.40 mm) |
| Flywheel/Coil Air Gap | 0.012 to 0.016 in. (0.30 to 0.40 mm) |
| Spark Plug Type | NGK BPM7A |
| Spark Plug Gap | 0.025 in. (0.61 to 0.71 mm) |
| Crankshaft Main Bearings | Ball |
| Fuel Tank Capacity | 25 fl. oz. (750 ml) |
| Fuel Oil Ratio | 50:1 with ECHO oil, otherwise 32:1 |
| Recommended Fuel Octane | 89 regular automotive. |
| Aspen2 pre-mixed Alkylate fuel | Best at 93 octane, no ethanol |
| Mix Oil Specification | ECHO two cycle |
| Aspen Synthetic mix oil | Best |
| Chain Pitch | 3/8 in. |
| Chain Type | Oregon 72LP |
| Bar Mount Pattern | 10 link |
| Shortest Guide Bar Supplied | 16 in. (40 cm) |
| Longest Guide Bar Supplied | 24 in. (60 cm) |
| Color Scheme | ECHO Orange enamel with Black trim |
Features
- Manufactured by Echo (Kioritz Corporation) in Yokosuka, Morioka, Japan
- Introduced in 1975
- Air-cooled engine with a piston-port intake method and an aluminum cylinder with chrome-plated bore
- Equipped with a centrifugal clutch with three metal shoes and direct drive
- Die-cast magnesium construction for durability
- Anti-vibration handlebar system for comfortable operation
- Mechanical chain brake for safety
- Automatic oil pump and nylon mesh air filter system
- Flywheel magneto with breaker points for ignition
- Equipped with a Tillotson HS-166A carburetor and NGK BPM7A spark plug
- The shortest guide bar supplied is 40 cm (16 in.), and the longest is 60 cm (24 in.)
- Echo orange enamel with black trim color scheme
Different Models
The Echo CS-702, CS-702VL, and CS-702EVL are three models of chainsaws from the same series. Here are the key differences between them:
- The CS-702 is the basic model and was the first to be introduced in 1975.
- The CS-702VL was introduced later and featured a different type of air filter, the “Ventilated Large” air filter system, which was designed to help the engine run cooler.
- The CS-702EVL was a later version that added an electronic ignition system, which replaced the flywheel magneto with breaker points. This electronic ignition system helped improve the saw’s starting ability and also helped with fuel efficiency.
Other than these differences, the three models are very similar in terms of their specifications and features.
Conclusion
To sum up, the Echo CS-702 chainsaw is a reliable and powerful tool that has stood the test of time. With its durable construction, efficient engine, and user-friendly features, the CS-702 is a favorite among loggers and homeowners for a reason. Echo’s commitment to quality and innovation has made them a trusted brand in the chainsaw industry, and the CS-702 is a testament to their dedication to producing high-performing and long-lasting tools.