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I
I
I
components as it will damage shoe linings and springs. Install clutch puller. Make sure 3 puller bolts go into clutch hub evenly and
as far as possible so they don’t pull the threads out of the hub. To reduce damage to end of crankshaft, put a penny between puller
screw and end of crankshaft to help protect it. Turn the center bolt of the puller to remove clutch from crankshaft, hold puller in one
hand so clutch and puller do not fall onto the ground when they loosen. See photo III-30.
To remove clutch drum, use a small screwdriver or punch and carefully tap end of woodruff key which should begin to turn in slot
which will allow removal. Then remove washer, be sure to note the way the washer is installed, with the cupped side facing out. See
illustration III-32. Remove drum and bearing (early models will have a bushing pressed into clutch drum). Disassemble clutch by
using a
5
⁄
32
” or 4mm allen wrench to loosen 3 clutch shoe bolts. Remove clutch shoes and bolts, then carefully remove bolts and
washers from shoes, making note of the washer positions. There are 4 pairs of cup washers with a flat washer at the bottom of the
shoe bolt hole. See photos III-33 and III-34.
Clean all parts thoroughly in a non-flammable solvent and inspect all parts closely for wear or cracking. Check shoe friction mate-
rial for thickness and even wear, also make sure friction material is not separating from shoe. Check spring washers for signs of
abnormal wear or for flattening, also examine shoulder bolts for any grooves or wear. Check inside of clutch drum for scoring or
uneven wear. If clutch shoes or drum appear glazed, they can be lightly sanded with 200 grit sandpaper to remove glaze. Make sure
to flush away all sanding debris. Check the drum bushing for wear visually, and by attempting to rock drum while installed on
crankshaft. Replace bushing if excessive play or wear is evident. Check keyway in bore of clutch hub for signs of wear or damage,
as well as crankshaft keyway and woodruff key. Replace any damaged or worn parts.
Action Racing strongly suggests using the spring washers in the stock configuration, with 4 pairs of spring washers facing each
other and the flat washer at the bottom. See diagram III-33. For racing use, the clutch should engage from 6,000 to 6,500RPM. For
recreational use or for beginners, the clutch can be adjusted from about 5,000RPM and above. To modify the rpm at which the clutch
engages, replace the flat washer with a thicker or thinner one. Use the same thickness washer on all three shoes!
Inspect both sides of clutch nut
assembly for wear or breakage,
replace as needed.
Proper orientation of washer
between clutch and drum
Diagram of clutch bolt, spring washers and flat washer.
Partially disassembled 3-shoe clutch, note position of washers on shoulder bolt.
Complete 3-shoe clutch, drum and
starter gear assembly.
to drum
clutch
side
Apply thread
locker
III
III
.31
.31
III
III
.32
.32
III
III
.33
.33
III
III
.35
.35
III
III
.34
.34
used on
most
models
