135-Hour or Annual Maintenance

■■Combustion chamber should be decarbonized, and the valve clearance should be adjusted. It is highly recommended that this is done by a Shindaiwa-trained service technician.

■■Replace the spark plug annually: Use only NGK CMR5H or equivalent resistor type spark plug of the correct heat range. Set spark plug electrode gap to 0.6 mm (0.024 in).

NOTE:

The NGK CMR5H also meets the requirements for electro magnetic compliance (EMC).

CAUTION!

Performing a valve adjustment incorrectly may cause hard starting and/or can damage the unit. Refer to the Service Manual for complete valve adjustment procedure and torque specifications.

If you are unfamiliar with this engine or uncomfortable with this procedure, Consult with an authorized Shindaiwa servic- ing dealer.

Valve Adjustment

1.Remove cylinder cover, rocker arm cover, and set piston at TDC-compression.

2.Loosen adjuster locknut so that the

2.5 mm Allen socket head adjustment screw can turn freely.

3.Insert feeler gauge .004 (0.10 mm) for both intake and exhaust; between valve stem tip and rocker arm.

4.Turn adjustment screw (clockwise = tighter, counter-clockwise = looser) until feeler gauge is almost snug. Back off just enough to allow gauge to slip out with limited resistance.

5.While holding adjustment screw in place with Allen driver, tighten locknut with wrench.

6.Turn engine over several times, and return to TDC-compression. Recheck with proper feeler gauge to make sure clearance adjustment did not change as a result of tighten- ing locknut. Readjust as necessary.

7.Replace rocker arm cover gasket to assure proper sealing and install cover.

IMPORTANT!

If new gasket is not available and/or old gasket is not damaged, old gasket may be reused. Never use cracked or damaged gaskets!

Figure 23

Figure 24

Figure 25

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Shindaiwa HT254EF, X7502864200 manual Hour or Annual Maintenance, Valve Adjustment

X7502864200, HT254EF, HT254 specifications

The Shindaiwa X7502864200, also known as the HT254 and HT254EF, is a high-performance hedge trimmer designed for both professional landscapers and avid home gardeners. This tool stands out in the market due to its powerful engine, durability, and advanced features that enhance efficiency and user experience.

One of the key features of the HT254 is its robust, low-emission 25.4cc engine. This engine is designed to deliver exceptional power while adhering to stringent environmental regulations. It not only ensures a longer run time but also contributes to a cleaner, greener working environment. The engine’s low-vibration design reduces operator fatigue, making it ideal for extended use during large landscaping projects.

A notable technology incorporated in the HT254 is the heavy-duty double-sided reciprocating blades. These blades are engineered to provide precise cutting performance, allowing for clean and efficient trimming of hedges and shrubs. The sharp edges ensure that users can handle thicker branches with ease, resulting in a more polished finish. Additionally, the blades are constructed from high-quality materials that resist wear and corrosion, promising longevity and less frequent replacements.

The design of the HT254 also prioritizes user comfort and control. It features an ergonomic handle with a comfortable grip, enabling easy maneuverability during operation. The adjustable cutting angles allow operators to reach various heights and angles without straining, making it suitable for a variety of hedge types and styles.

Another important characteristic of the HT254 is its lightweight construction. Weighing in at just over 10 pounds, the tool is easy to carry and operate, reducing the physical strain often associated with heavier machines. The inclusion of a manual recoil starter ensures that users can start the engine reliably without frustration.

The HT254EF variant adds an electric start option for even more convenience, allowing users to start the engine with just the push of a button. This feature is particularly beneficial for those who may struggle with traditional pull-start mechanisms.

Overall, the Shindaiwa HT254 and HT254EF hedge trimmers are equipped with advanced technologies and exceptional features that elevate their usability and efficiency. Whether for professional landscaping businesses or personal gardening tasks, these tools deliver power, precision, and user-friendly operation, making them a valuable addition to any garden care toolkit.