Triumph 650 Pre-Unit and Unit Nitrided Inlet Camshaft PN# 70-3134 E3134

The famous E3134 “Sports” inlet camshaft form dates back to the early 1950s, when it was considered a “hot cam” for high-performance applications. Also known as the “Q” cam, its profile has been applied to various part numbers, among them E3134, E4819, E5162, E10040, and E11063.

The current version of the E3134 “Q” camshaft features a nitrided finish to minimize wear and is forged from a hollow blank to accommodate the earlier crank case venting system and is also compatible with the 1970-onward breather system. 70-3059R 1-1/8 radius cam followers are suggested for use with the “Q” camshaft to maximize the mid-range engine performance that this camshaft is known for. From LF Harris in the UK.

The camshaft is considered the “brain” of the internal combustion engine, as it synchronizes the valvetrain events that contribute to determining the character of the motor. The camshaft works in harmony with the cam followers, pushrods, rocker arms, valve springs and valves to produce the sequence of valvetrain function in the Triumph twin cylinder engines.

The crank cases must be split to access the camshafts in the unit- construction Triumph 650 and 750 engines. Once fitted, careful attention must be paid to cam timing to ensure a properly functioning engine. Refer to the factory workshop for camshaft installation and timing specifications. Special tools are required for removal and installation of the camshafts. 

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