Triumph 650 Half Race Camshaft Set PN# 70-3134 70-9989 E3134 E9989

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 70-9989 exhaust camshaft also shares the “Q” cam profile and has been applied to various other part numbers, including E5047 and E10041. This combination of camshafts is commonly referred to as the “Half-Race” camshaft set.

The current version of the 70-3134 “Q” inlet 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 inlet cam followers are suggested for use with the “Q” camshaft to maximize the mid-range engine performance that this camshaft is known for. The 70-9989 exhaust camshaft shares the “Q” cam profile and nitrided finish and is recommended to be used with the 70-8801 R-radius exhaust cam followers. Some enthusiasts have found this camshaft combination to offer superb street performance in the Triumph 750 models as well. 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.

NOTE: CAMSHAFT NUTS ARE NOT INCLUDED, SEE RECOMMENDED LINKS FOR NEW CAMSHAFT NUTS.

WE ALSO STOCK A SLIGHTLY HOTTER CAMSHAFT SETUP FOR THE BIKE YEARS LISTED ABOVE, CLICK HERE.

FOR TAPPETS, CLICK HERE.

FOR TRIUMPH 650 & 750 CAM BUSH SETS 1970 ONWARD, CLICK HERE.

FOR OUR COMPLETE SELECTION OF CAMSHAFTS, CLICK HERE.