Honda CRF450RX 2020 Owner's Manual & Competition Handbook page 81

Clutch System
Clutch Disc/Plate/Spring Inspection
• Replace the clutch discs (1) if they show signs of
scoring or discoloration.
Measure the thickness of each clutch disc.
Service Limit: 0.112 in (2.85 mm)
Replace the clutch discs and clutch plates as a
set.
(1)
(1) clutch discs
• Check the clutch plates (2) for excessive
warpage or discoloration.
Check the plate warpage on a surface plate using
a feeler gauge.
Service Limit: 0.006 in (0.15 mm)
Replace the clutch discs and plates as a set.
(2) clutch plates
76
Servicing Your Honda
• Check the clutch springs (3) for wear or damage.
Measure the free length of each clutch spring.
Service Limit: 1.917 in (48.70 mm)
Replace the clutch spring as a set.
(3)
(3) clutch springs
• If you feel the clutch slipping after replacing the
clutch disc and plate, replace the clutch springs.
(2)
Clutch Disc/Plate Installation
1. Install the spring seat (1) and judder spring (2)
onto the clutch center as shown.
Coat the clutch discs with engine oil.
2. Install the clutch disc A (larger I.D. disc) (3)
onto the clutch outer.
Stack the six clutch plates (4), five clutch discs
B (5) alternately while aligning the lugs (6) of
the clutch center with the groove (7) of the
clutch plates as shown.
Install the clutch disc C (8).
(6)
(5)
(8)
(4)
disc C disc B
(1) spring seat (5) clutch discs B
(2) judder spring (6) lugs
(3) clutch disc A (7) groove
(4) clutch plates (8) clutch disc C
(7)
(3) (2) (1)
disc A