Adjusting The Centrifugal Clutch - KTM 50 MINI ADVENTURE Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE
1
2
1
1
4
5
8
8
6
8
11
9
10
11
7
Kupplung neu
Clutch new
Frizione nuova
Embrayage neuf
Embrague nuevo

Adjusting the centrifugal clutch *

A correctly adjusted centrifugal clutch will provide maximum engine perform-
ance and ease of driving and prevent the engine from overheating. Clutch wear
can affect the clutch engagement speed.
1
The clutch will slip for a longer period of time at higher clutch engagement
speeds, generating more frictional heat and causing the engine to overheat.
If the clutch engagement speed is too low, the engine will not reach the per-
formance range. In both cases, the engine will not seem to have enough power.
Check the clutch engagement speed every 20 hours and correct if necessary
or have it corrected by an authorized KTM workshop.
1
1
To tune your clutch, lay the bike on the left side. To prevent oil from leaking
from the transmission vent hose, run the hose upwards and fasten. Remove
the screws [1] and the clutch cover [2] and discard the gasket.
3
Block the centrifugal clutch [3] with a suitable driver [4].
NOTE: insert the driver through both holes in the primary drive's drum and
Loosen the nut [5] on the clutch and pull out the driver.
Remove the nut and shim from the crankshaft.
Screw the extractor (special tool item no. 590.29.021.044) onto the clutch
hub [6] with the M5x50 screws, hold the extractor and remove the centrifu-
gal clutch from the crankshaft by screwing in the extractor screw.
Completely remove the centrifugal clutch, bearings and spacing washers from
the crankshaft.
Loosen the HH screws [7] and remove the clutch shoes [8] from the clutch
hub [6]. Remove the HH screws and bushings [9], the clutch springs [10]
6
and the disks [11] from the clutch shoes.
ADJUSTING THE CLUTCH ENGAGEMENT SPEED:
The disks [11] used to pretension the clutch springs are located between the
clutch springs (minimum length 19.6 mm) and the clutch shoes. Pretensioning
the clutch springs lets you adjust the clutch engagement speed. 0.5 mm more
pretension will increase the engagement speed by approx. 500 rpm.
The clutch engagement speed is the speed at which the clutch begins to engage
to make the motorcycle drive off. The 50 AC engine has a clutch engagement
speed of 4000-4500 rpm.
NOTE: a tachometer (special tool item no. 451.29.075.000) to test the clutch
11
CORRECTING CLUTCH WEAR:
Check the clutch shoes for wear. If the surface is only slightly worn you can
remount them again.
NOTE: The centrifugal clutch has an outer diameter of approx. 82.5 mm
To correct slight wear to the surface, you can insert one of the pretensioning
disks [11] from each clutch spring between the clutch hub and the clutch
shoes – see illustration.
gebraucht If only one disk is installed, you can go ahead and use it.
The inner diameter of the centrifugal clutch drum may not exceed 84.4 mm
used
(new condition 84.0 mm).
usato
usure
Assemble in the reverse order.
usado
Apply Loctite 243 to the HH screws [7] and tighten to 12 Nm.
Apply Loctite 243 to the M10x1.25 nut [5] on the crankshaft and tighten to 35 Nm.
Mount a new gasket and position the clutch cover [2].
Screw on the clutch cover with 6 M6x25 screws [1] and tighten to 10 Nm.
Move the transmission vent hose back in the original position.
»
gear wheel.
engagement speed is available from your KTM dealer.
when new.
29