Clutch Masters 02-06 Acura RSX 5sp / 02-12 Honda Civic SI 6sp 725 Race Single Clutch Kit w/ Steel FW
The Clutch Masters 08037-SD7R-S is a 725 Series Race super single clutch with a billet steel flywheel for K-series Honda and Acura gearboxes, listed here for the 2002-2006 Acura RSX and the 2002-2012 Civic Si. It is for owners whose turbo or high-compression K20/K24 has outgrown a full-size street clutch and who want a small, light, quick-revving package built for the drag strip with occasional street use.
Most performance clutches for these cars use a full-size disc. The 725 Series shrinks the friction surface to 7.25 in (184 mm), which cuts rotating mass so the engine revs up and down faster between shifts. Clutch Masters builds the 725 cover from billet aluminum with a Type 3 hard anodize and quotes about .003 in of cover flex versus as much as .030 in on cast or stamped covers, so pedal movement goes into releasing the clutch instead of bending the cover. The steel flywheel that comes in the -S kit is machined from 1045 billet and black oxide treated. In Clutch Masters' 725 naming, the R stage is the Race friction (ceramic rigid on their multi-disc kits), so expect a sharp, on-off engagement.
A slipping clutch shows RPM climbing without matching road speed in a high gear at full throttle. Before buying, check that the hydraulics are releasing correctly; a failing slave or a soft line can cause drag and grinding that feel like clutch wear. Our slipping diagnosis guide covers the checks. If you already have the gearbox apart, look at the flywheel for hot spots and cracks; because this kit includes its own flywheel, a damaged one is not a problem.
This is not a daily-driver clutch. Clutch Masters is clear that the 725 platform is focused on drag racing and can handle occasional street driving. If you drive in traffic every day, a full-size kit such as the 08037 FX-series single disc is easier to live with. If you need more holding power than one 7.25 in disc gives, the 725 twin disc with steel flywheel uses the same compact size with two friction plates.
The listing names the 2002-2006 Acura RSX (base 5-speed and Type-S 6-speed) and the Honda Civic Si through 2012. The Clutch Masters chart for 08037-SD7R-S lists RSX 2002-2006 2.0L 5-speed and Type-S 6-speed, Civic Si 2002-2005 2.0L 5-speed, Civic Si 2006-2011 2.0L 6-speed and 2012-2015 2.4L 6-speed, plus TSX 2004-2014, Accord 2.4L 2003-2012, CSX Type-S and ILX 2.4L 6-speed. Note that the 2002-2005 Civic Si was a 5-speed, not a 6-speed as the title suggests. K-swapped chassis vary, so send us the engine, gearbox and VIN before you order.
| Brand | Clutch Masters |
| Part number | 08037-SD7R-S |
| Fits | Clutch Masters 02-06 Acura RSX 5sp / 02-12 Honda Civic SI 6sp 725 Race Single Clutch Kit w/ Steel FW |
| Vehicle fitment | Acura Rsx 5Sp / 02-12 (2002-2006) |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. The -S suffix and the listing title both indicate a steel flywheel, and Clutch Masters describes its steel flywheels as 1045 billet with a black oxide finish.
Clutch Masters lists the 2006-2011 Civic Si 2.0L 6-speed in the chart for 08037-SD7R-S. Our listing title says through 2012, so send your VIN if you have a 2012 2.4L car and we will confirm.
No. Clutch Masters files 08037-SD7R-S under Super Single Clutch Kits. It uses one 7.25 in disc. The 725 twin and triple kits are separate part numbers.
Occasionally. Clutch Masters says the 725 platform is focused on drag racing. Expect quick, harsh engagement and more noise than a full-size street clutch.
Check the slave cylinder and clutch line, replace tired engine and transmission mounts, and refill the gearbox with fresh Honda manual transmission fluid.
Yes. Clutch Masters lists the 2002-2006 RSX 2.0L 5-speed as well as the Type-S 6-speed for this part number.
