Carburetor Adjustment, Engine Break-In

	MAINTENANCE	CS-450

	Carburetor Adjustment
	Carburetor Adjustment
	Every unit is run at the factory and the carburetor is set in	T
	compliance with Emission Regulations. In addition, the	T
	compliance with Emission Regulations. In addition, the
	carburetor is equipped with “H” (High Speed) and “L” (Low
	Speed) needle adjustment limiters that prevent settings
	outside acceptable limits.	L H
	Engine Break-In	L H
	Engine Break-In

New engines must be operated a minimum duration of two tanks of fuel break-in before carburetor adjustments can be made. During the break-in period your engine performance

will increase and exhaust emissions will stabilize. Idle speed can be adjusted as required.

High Altitude Operation

This engine has been factory adjusted to maintain satisfactory starting, emission, and durability performance up to 1,100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation and emission compliance above 1,100 feet ASL the carburetor may need to be adjusted by an authorized ECHO service dealer.

If the engine is adjusted for operation above 1,100 feet ASL, the carburetor must be re-adjusted when operating the engine below 1,100 feet ASL, otherwise severe engine damage may result.

1.Before adjusting carburetor clean or replace air filter and muffler “Spark Arrestor Screen”.

2.Make sure the bar and chain are properly adjusted.

3.Start engine and run several minutes to bring to operating temperature. Flash choke twice during warm-up to clear any air from the fuel system.

4.Stop engine. Turn “H” speed needle counterclockwise (CCW) to stop. Turn “L” speed needle midway between full clockwise (CW) stop and CCW stop.

5.Idle Speed Adjustment:

•Start engine, turn “Idle” speed adjustment screw “T” CW until the saw chain begins to move, then turn screw out CCW until the saw chain stops moving. Turn screw out, CCW, an additional 1/4 turn.

When carburetor adjustment is completed, the saw chain should not move at idle, otherwise serious personal injury may result.

6.Accelerate to full throttle for 2 - 3 seconds to clear any excess fuel in the engine, then return to idle. Accelerate engine to full throttle to check for smooth transition from idle to high speed. If engine hesitates turn “L” needle CCW 1/8 turn and repeat acceleration. Continue adjustment until smooth acceleration results.

7.Check idle speed and reset if necessary as described in item 5. If a tachometer is available idle speed should be set to value listed on technical data page.

When starting, idling adjustment speed should be adjusted to prevent the saw chain from moving. When you experience trouble with the carburetor, contact your dealer.

28	X7503196706

CS-450 specifications

The Echo CS-450 is a powerful and versatile chainsaw designed for both professional and home use. Renowned for its reliability and performance, the CS-450 is an ideal choice for tree care, land management, and firewood cutting. With its robust design, it stands out as a dependable tool for various cutting tasks.

One of the standout features of the Echo CS-450 is its engine. It is powered by a 45.0 cc, 2-stroke engine that delivers exceptional power while maintaining fuel efficiency. This engine translates to a power output of approximately 2.7 kW, allowing users to tackle demanding cutting jobs with ease. The chainsaw also incorporates a patented i-30 starting system, which reduces the effort required to start the engine. This feature significantly enhances user experience, especially during cold starts or extended use.

The CS-450 is equipped with a 20-inch guide bar, making it suitable for medium to large cutting tasks. The bar length provides a good balance between maneuverability and cutting capacity. Additionally, the chainsaw operates with a low-kickback chain, improving user safety while offering smooth and efficient cutting performance. This is especially important for both novice and experienced users, as it minimizes the risk of accidents.

In terms of design and ergonomics, the Echo CS-450 is built for comfort and ease of use. The chainsaw features an anti-vibration system that reduces operator fatigue during prolonged use. Its lightweight construction, weighing around 10.1 lbs, makes it easy to handle without sacrificing power. The front and rear hand grips are designed for enhanced comfort, allowing users to maintain good control over the saw.

The CS-450 is also equipped with a tool-less air filter cover and a side-access chain tensioner, making maintenance straightforward and efficient. The cleaner air filter helps extend engine life, while the quick chain tensioning system allows users to make adjustments effortlessly on the job.

For those who value durability, the Echo CS-450 features a heavy-duty build that includes a magnesium crankcase, resisting wear and tear under demanding conditions. The chainsaw is designed to operate in various environments, whether it be professional settings or home gardening tasks.

In summary, the Echo CS-450 combines power, efficiency, and comfort in a robust design. With its advanced features, including a high-performance engine, safety mechanisms, and user-friendly design elements, it remains a top choice for individuals seeking a reliable and effective chainsaw. Whether you are cutting firewood or maintaining trees, the CS-450 is an excellent partner to get the job done efficiently and safely.