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DXL Disc Clutch
Horstman's patented (U.S. Patent No. 4,111,291) DXL clutches are of the oil bath multiple disc design for two cycle racing.  The DXL has been a proven winner since 1978 when they were first introduced.  Many upgrades have been made since the originals in order to provide the racer with an economical yet high performance clutch.  Features include three discs for positive hook up and easy adjustment of stall speed through the oil cover.  For the Sr. Sportsman class and the Yamaha KT Lite class the four spring design DXL-991 is a good choice.  For the Yamaha Heavy class, the six spring design DXL-3000 is preferred. 
Owner's manual.
Part # Complete DXL Clutches List Sell
DXL-991
3 Disc 4 Spring Clutch
384.71 269.30
DXL-3000
3 Disc 6 Spring Clutch
391.82 274.27
DXL9903B 3Disc Extended Hub Clutch
Fits IAME Taper
Specify #teeth & chain when ordering
Only one left
406.07 284.25
DXL-992
3 Disc 4 Spring Clutch

For Vintage McCullough RH thread PTO
384.71 269.30
DXL-993
3 Disc 4 Spring Clutch

For Vintage McCullough LH thread PTO
384.71 269.30

DXL Drums & Clutch Parts
Clutch Spacers | Drums | Hubs | Miscellaneous Parts | Rebuild Kits
spacer bushing bushing key key drum hub hub shim shim friction disc friction disc friction disc floater floater pressure plate weight ring aluminum weight support weight or lever cover bearing cover bearing assembly screw starter nut starter nut gasket oil fill plug cover screw cover nut hub screw spring spring retainer spring screw billet cover
Ref# Part # Horstman Clutch Spacers List Sell
1 Spacer, special -- smaller O.D. (.665")
For use with 10t #219 drums only
Three widths available
Tech tip:  Usually takes a .105" with the 10t #219 drum
3.94 3.15
1 Spacer, standard O.D. (.740")
Fits Standard Drums with bushings (9t#35 & 11t#219)
15 widths available
Tech tip:  Usually takes a .125" wide spacer
3.94 3.15
  H324500 Spacer Kit
Contains 1 each standard spacer (.065"  through .205") 
56.49 42.37
1 Spacer, special -- larger O.D. (.830")
For use with drums with needle bearing only
Five widths available
Tech tip:  Usually takes a .125" wide spacer
3.94 3.15

Horstman DXL Clutch Drums
Ref# Part # Description List Sell
2 H322100 Replacement Bronze Bushing
Fits 10t #219 drums
Reaming required after installation
4.02 3.22
2 H300300 Replacement Brass Bushing
Fits 9t #35 OR 11t #219
Reaming required after installation
6.73 5.38
2 H300400 Replacement Needle Bearing
Fits DXL drums with needle bearing
10.08 8.06
3 H300900 Drum 9t #35 75.06 56.30
3 H301000 Drum 10t #35 76.94 57.71
3 H301100 Drum 11t #35 78.91 59.18
3 H301200 Drum 12t #35 79.85 59.89
3 H301300 Drum 13t #35 79.85 59.89
3 H301400 Drum 14t #35 79.85 59.89
3 H301500 Drum 15t #35 81.67 61.25
3 H322000 Drum 10t #219 -- Fits 1 Disc DXL clutch only 57.60 43.20
3 H331000 Drum 10t #219 70.06 52.55
3 H331100 Drum 11t #219 70.06 52.55
3 H331200 Drum 12t #219 70.94 53.21
3 H331300 Drum 13t #219 70.94 53.21
3 H331500 Drum 15t #219 73.74 55.31
3 H301900 Drum 19T Belt drive x 8mm pitch x 20mm wide 138.46 103.85

Horstman DXL Clutch Hubs
Ref# Part # Description List Sell
4 H390600 Hub, DXL-990
Fits 3 Disc Clutch (IAME taper)
115.28 86.46
4 H390700 Hub, DXL-2000
Fits 3 Disc Clutch (Rotary Valve taper 5°)
115.28 86.46
4 H390800 Hub, DXL-991
Fits 3 Disc Clutch (Yamaha taper)
115.28 86.46
4 H316500 Hub, DXL-990 3B
Fits 3 Disc Extended Clutch (IAME taper)
123.42 92.57

Horstman DXL Clutch Parts
Ref# Part # Description List Sell
5 Shim -- Three thickness available 2.38 1.90
6 H334000 Standard Semi-Metallic Friction Disc 32.21 25.77
7 Floater Plate
Two thickness available
26.75 21.40
8 H335000 Pressure Plate
Fits all 4 Spring DXL Clutches
62.64 46.98
8 H334200 Pressure Plate
Fits all 6 Spring DXL Clutches
66.22 49.67
9 H334400 Weight Guide Ring, chrome plated 20.84 16.67
10 H335100 Weight Support, aluminum
Fits all 4 Spring DXL Clutches
92.05 69.04
10 H334500 Weight Support, aluminum
Fits all 6 Spring DXL Clutches
94.84 71.13
11 H304800 Weight (Use With DXL-700 single Disc Clutch) 3.16 2.53
11 H305100 Weight, optional Snub Nose 3.35 2.68
11 H334600 Weight, chromed plated for 6 Spring 5.23 4.18
11 H335200 Weight, 4 Spring standard 3.31 2.65
11 H335300 Weight, 4 Spring with hole 3.31 2.65
11 H335400 Weight, optional with large hole 2.88 2.30
12 H303800 Gasket 3.34 2.67
13 H304200 Bearing for Aluminum Cover 12.55 10.04
14 H307000 Billet Aluminum Cover 85.40 64.05
  H307400 Snap ring - cover bearing retention 1.99 1.59
  H307500 Cover Washer, standard hub clutches 1.99 1.59
  H307600 Cover Washer, Extended hub clutches 2.47 1.98
15 H334900 Assembly Socket Head Cap Screw 1.18 0.94
15 H335500 Assembly Screw (for 2 disc clutch) 0.91 0.73
16 H313000 Spring, standard (.091" wire) 4.82 3.86
16 H313100 Spring, optional (.100" wire) 4.99 3.99
17 H334700 Retainer, spring
For use with H313000 standard spring
1.23 0.98
17 H313200 Retainer, spring
For use with H313100 optional spring
1.97 1.58
  H313300 Optional Spring Kit
Heavy Springs (H313100) with retainers (H313200)
22.43 17.94
  H313400 Two Stage Kit
Includes heavy springs, retainers & 2 stage weights
73.59 55.19
18 H334800 Screw, stall speed adjusting 1.23 0.98
19 H306100 Oil Fill Plug 2.47 1.98
20 H315100 Extended Starter Nut 
Fits extended hub clutches
14.03 10.52
20 H703600 Extended Starter Nut with step
Fits standard DXL clutches
22.82 17.12
20 H315200 Extended Starter Nut
Fits extended hub clutches (rotary valve)
17.55 13.16
20 H315300 Extended Starter Nut
Fits extended hub clutches (DINO engine)
17.55 13.16
21 H303900 Cover Screw 1.08 0.86
22 H309200 Cover Nut 0.74 0.59
23 H312900 Hub Screw 1.12 0.90
24 H309300 Woodruff Key 2.38 1.90
  H302900 Nut Ring
Replaces cover nuts for quick removal
16.51 13.21

Horstman DXL Clutch Rebuild Kits
Part # Description List Sell
H310200 Rebuild Kit -- Fits 3 Disc 4 Spring Clutch 174.31 130.73
H310300 Rebuild Kit -- Fits 3 Disc 6 Spring Clutch 177.72 133.29
H310400 Rebuild Kit -- Fits 2 Disc 4 Spring Clutch 111.56 83.67

Clutch Tools | Blueprinted Clutch Springs

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

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