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Horstman MDC Clutches
Horstman's MDC clutch is a proven winner since its introduction in 1990.
Crafted from quality components with an emphasis on performance as well as value.
'98 Owner's Manual   '99 Owner's Manual
-->Lever/weight combination calculated at factory -->Stall speed easy to adjust with allen wrench
-->Cam action levers for quick acceleration -->Components heat treated to last a long time
-->6 spring models (MDC-400S) available for stock classes, Superstock classes and Kage Karts -->6 spring models (MDC-400M) available for modified classes
-->4 spring models (MDC-444) available for restricted and stock classes -- special order only --> Fits onto 3/4" diameter crank

MDC Complete Clutches
Part# Description List Sell
H461100 MDC-400S Stock Clutch
With 11t Drum
This clutch will only accept 11t drum		 257.50 180.25
MDC-400S Stock Clutch
*For Stock Class		 257.50 180.25
H471100 MDC-400S Modified Clutch
With 11t Drum
This clutch will only accept 11t drum		 257.50 180.25
MDC-400M Modified Clutch
*For Modified Class		 257.50 180.25
MDC-400S Stock Clutch
ARENA STYLE CLUTCH		 296.64 207.65

outboard mounting kit snap ring outer washer bearing nut ring drum thrust washer thrust bearing thrust washer hub friction disc floater pressure plate weight guide ring lever lever support spring spring retainers screw cover cover screw assembly screw
MDC Drums & Parts
Part# Description Ref# List Sell
H463000 Snap Ring 1 1.09 0.87
H463100 Outer Thrust Washer
(use on 12T to 13T)		 2 1.50 1.20
H463200 Outer Thrust Washer
(use on 14T to 21T)		 2 1.50 1.20
H463300 Thrust Washer
(use 1 outside & 1 inside with 11T drum only)		   1.63 1.30
H463400 Replacement Bronze Bushing
fits 12T and 13T drums only		 3 9.85 7.88
H463500 Replacement Needle Bearing
fits 14T to 21T drums		 3 10.33 8.26
H463600 Replacement Bushing for 11T 3 8.15 6.52
H441100 Drum 11T#35
This drum fits 11t clutch only		 4 57.57 46.06
H441200 Drum 12T#35 4 59.13 47.30
H441300 Drum 13T#35 4 59.13 47.30
H441400 Drum 14T#35 4 59.13 47.30
H441500 Drum 15T#35 4 59.13 47.30
H441600 Drum 16T#35 4 59.13 47.30
H441700 Drum 17T#35 4 60.67 48.54
H441800 Drum 18T#35 4 60.67 48.54
H441900 Drum 19T#35 4 60.67 48.54
H442100 Drum 21T#35 4 60.67 48.54
H442300 Drum 23T#35 4 63.81 51.05
H480078 Thrust Washer, hardened 5A 1.61 1.29
H480079 Thrust Bearing 5B 4.51 3.61
H463700 Inner Thrust Washer
older clutches		 5 1.50 1.20
H480090 Splined Hub
With thrust bearing and washers		 6 104.61 83.69
H463900 Splined Hub (Fits 11T Clutch only) 6 71.41 57.13
H464000 Metallic Friction Disc 7 29.27 23.42
H464100 Floater .075", optional 8 23.70 18.96
H464200 Floater .085", standard 8 23.70 18.96
H464300 Floater .095", optional 8 23.70 18.96
H464400 Floater .105", optional 8 23.70 18.96
H464500 Floater .065", optional 8 23.70 18.96
H464600 Pressure Plate 9 67.21 53.77
H334400 Lever Guide Ring 10 18.12 14.50
H464700 Lever, weighted, standard MDC-400S 11 6.82 5.46
H113500 Lever, non-weighted, standard MDC-400M 11 5.61 4.49
H464800 Lever support (aluminum) 12 77.79 62.23
H465000 Spring, black (MDC-400S) .085" 13 4.73 3.78
H464900 Spring, red (MDC-400M) .091" 13 4.73 3.78
H514200 Spring, blue .075", optional 13 3.84 3.07
H334700 Spring Retainer 14 1.07 0.86
H334800 Adjustment Screw 15 1.07 0.86
H334900 Cap Screw 16 1.03 0.82
H465100 Special Key   2.39 1.91
H465200 Special Washer 5/16"ID   0.81 0.65
H465300 Bolt   0.81 0.65
H465400 Clutch Cover 20 12.05 9.64
H302900 Nut Ring 21 13.76 11.01
H303900 Cap Screw 22 0.90 0.72
H465600 Outboard Mounting Kit
(12T through 21T only)		 23 15.94 12.75
H462600 Arena Mounting Kit   33.72 26.98

Rieken's Racing offers expert rebuilding of all Horstman disc clutches. 
Please email for details.

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