#Decompressor cable manual#
#Decompressor cable full#

Manual or automatic decompressor systems that use a lever or decompressor specific rocker arm often use an adjustable tappet that must maintain a correct clearance with the exhaust valve or rocker arm. If the mechanism sticks or fails to operated correctly inspect the components in more detail for condition and correct assembly. Inspect the decompressor mechanism functions smoothly and correctly as the weight/s are manually moved out to a running position and allowed to return to a resting position.

#Decompressor cable full#

This change in position of the weight/s moves the decompressor rocker arm or pin into a position where it will not contact exhaust valve or rocker arm and the engine will have full compression.

When the engine starts and the camshaft is rotating at speed the weight/s will sling out. At rest and below idle rpm the weight/s are held in by the springs and the decompressor rocker arm or pin will contact the exhaust valve or rocker arm to release compression. Adjust the cable free play as needed.Īutomatic decompressor systems often use spring loaded weights on the camshaft to operate a pin located inside the camshaft or a special decompressor rocker arm. Check the free play at TDC, or as otherwise indicated by the service manual.

The cable or lever free play must be maintained within specification. Manual decompressor systems on four stroke engines often use a cable controlled lever to apply pressure to the exhaust valve or rocker arm. Check the service manual and periodic maintenance chart of the particular vehicle for the details and specifications associated with decompression system of the vehicle. Reducing the engine compression reduces the force required to kick start or pull start the engine, and allows the use of smaller less powerful electric starting components.ĭecompressor systems require maintenance and inspection to ensure correct function. The compression is reduced by momentarily opening an exhaust valve on the compression stroke of the piston to partially vent the combustion chamber. Decompressors systems are often used with single cylinder 4-stroke engines, but manufactures sometimes utilize these benefits on other engine configurations including V-twins. The decompressor system reduces the cylinder compression at low rpm for easy starting.