Page 5 of Clutch and Flywheel by Mazda MotorSports

clutch flywheel quarter master clutches quarter master clutches provide ultimate performance at high rpms and temperatures without the failures sometimes common to other clutch designs features and benefits include i low moment of inertia i lightweight aluminum clutch cover i unique closed-style design i improved sintered metal friction material that eliminates dusting i allows harder faster acceleration and deceleration into and out of corners i highest torque capacities and lowest wear rates all quarter master clutches and flywheels are built with the intent of making them as inertially light as possible without sacrificing durability we offer both the quarter master 7-1/4 and 5-1/2 2-disc clutch assemblies for rotary applications quarter master 5-1/2 clutch unit the lightweight 5-1/2 clutch unit with aluminum flywheel provides approximately 30 less rotational inertia and weight than the quarter master 7-1/4 clutch unit with aluminum flywheel it only is available for bottom mount starter applications with an aluminum flywheel quarter master clutches part number 0000-02-9103 code req c 1 description clutch ­ 5-1/2 assembly model engine type 12a/13b year all notes includes aluminum clutch cover pressure plate housing floater plate and 2-disc clutch pack requires use of quarter master bolt kits part #0000-02-9123 and #0000-02-9128 and quarter master radius-faced release bearing part #0000-02-9122 or #0000-02-9122-pb spline size 1 x 22 includes a quarter master lightweight aluminum cover pressure plate housing floater plates and 2-disc clutch pack requires use of quarter master bolt kit part #0000-02-9113 and quarter master release bearing part #0000-02-9112 spline size 1 x 22 0000-02-9101 c 1 clutch ­ 7-1/4 assembly 12a/13b all installation tips i using a 5-1/2 clutch and flywheel requires use of modified rear counterweight part #0000-01-9152 counterweight must be balanced to rotors if 1983-85 12a rotors are not being used template for drilling of rear counterweight also can be provided i when installing any clutch it is very important to check that clutch has adequate free-play in addition be sure that a pedal stop has been installed to prevent clutch from going over-centering quarter master clutches require the use of a special radius-faced release bearing do not use a flat-face bearing with any quarter master clutch note using a lightweight flywheel requires the use of a rear automatic transmission counterweight see counterweight section for part number listing page e-19 cf-5

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