ACT 4-Pad Sprung Racing Clutch Disc for 1990-1993 Mazda Miata

ACT 4 Pad Sprung Racing Clutch Disc (SKU: ACT-4200105) fits the 1.6L NA drivetrain in the Miata racing clutch 1990-1993 crowd, meaning 1990, 1991, 1992, and 1993 cars. This ACT 4200105 Miata disc sits between your flywheel and pressure plate, so when you let the pedal out it locks up and sends torque into the trans input shaft. Push the pedal in and it frees up so you can shift without fighting the drivetrain.

This is a Mazda Miata ceramic clutch with an ACT 4-pad clutch Miata puck layout, not a full face organic disc. That choice makes it a legit 1990 Miata racing clutch and 1993 Miata racing clutch option, but you pay for it in manners. You get quick bite and better heat tolerance, and you also get a more abrupt takeoff, potential judder from a stop, and some gear rattle that usually lands somewhere between OE like and mild. If you want buttery smooth street behavior, don’t pretend this is that disc, it isn’t.

ACT builds this as an ACT Miata torsional clutch with a sprung hub, so you still get some help controlling drivetrain shock during engagement and shifts. ACT specs heavy duty damper springs, and the drive plate uses heat treated spring steel, so it checks the boxes people mean when they say Miata heat-treated clutch and Miata heavy-duty clutch disc. Even with the sprung hub, the puck style lining still hits harder than an organic full face, so plan your clutch pedal work accordingly.

• Manufacturer part number 4200105
• SKU ACT-4200105
• Disc type Sprung hub, Mazda Miata sprung clutch
• Friction material Ceramic, Mazda Miata ceramic clutch
• Puck count 4 pad, ACT racing clutch disc
• Disc diameter 200 millimeters
• Disc diameter 7.9 inches
• Input spline quantity 22
• Splined bore diameter 0.9375 inches
• SFI specification 1.1
• Product weight 2.6 pounds
• Warranty 12 months

• Confirmed vehicle application 1990 Mazda Miata 1.6 liter, 1990 Miata ceramic clutch fitment
• Confirmed vehicle application 1991 Mazda Miata 1.6 liter including SE, Miata 1991 ACT clutch
• Confirmed vehicle application 1992 Mazda Miata 1.6 liter, Mazda clutch disc 1992
• Confirmed vehicle application 1993 Mazda Miata 1.6 liter including LE, Miata clutch disc 1993

Selection considerations for experienced installers:

• Use case ACT calls it race use only. If you daily your car in traffic, this disc will remind you of that decision.
• Engagement behavior Expect harsh engagement and possible judder on takeoff, plus OE to mild gear rattle.
• Compatibility check Confirm 200mm diameter and the 22 spline, 0.9375 inch bore match your trans input before you bolt it together.
• Scope Disc only. You still need the pressure plate, release bearing, pilot bearing, and alignment tool.
• Real world note We run these exact ACT discs on our own cars when we care more about bite and heat management than smooth launches.

Fitment:

Detailed Fitment:

• Miata 1990-2005

Technical details:

Product Weight (lbs.): 2.5

Install Guide:

Ensure the vehicle is securely lifted and the transmission is removed. Replace the old clutch disc with the ACT 4-Pad Sprung Racing Clutch Disc, ensuring proper alignment. Reassemble the transmission and lower the vehicle. Follow the manufacturer's torque specifications for all bolts.