Husqvarna TR 650 TERRA 2013 Workshop Manual page 26

Trouble
Engine excessively noisy
Manuale d'officina Ed. 09-2012
TROUBLESHOOTING
TR 650 TERRA 2013 - TR 650 STRADA 2013
Possible causes
Noise is heard when the engine is started:
Sprag clutch, sprag clutch housing or free-
wheel gear worn
Teeth of starter motor and/or starter drive
gears worn
Chain tensioner does not work
Noise seems to come from the valve train:
Excessive valve clearance
Chain tensioner does not work
Camshaft or brackets of camshaft worn
Camshaft drive worn or loose
Camshaft chain, chain guide or chain ten-
sion guide worn
Noise seems to come from the piston:
Piston or cylinder worn
Piston pin bore or piston pin worn
Piston rings broken or ring grooves worn
The noise seems to come from the
crankshaft, countershaft or crankcase:
Bearings of crankshaft or conrods worn
Worn needle bushing and/or balancer shaft
bearings and/or balancing connecting rod
Noise seem to come from the clutch or
clutch side:
Friction plates (hammer heads) and/or
clutch drum worn
Excessive or insufficient backlash of the
teeth of the primary drive gears
Clutch drum, clutch hub or pressure plate
worn
Bearing of clutch gear worn
Disk springs of primary drive assy. worn
Springs and spring retainers of primary
drive assy. Worn
Noise with clutch engaged - ball bearing of
the pressure plate worn
Noise seem to come from the gearbox:
Tooth flanks of the gearbox gears worn
Ball bearing of gearbox shafts and/or needle
bearings of gears worn
Remedy
Replace Sprag clutch, sprag clutch housing
or freewheel gear
Replace starter motor and/or starter drive
gears
Noise disappears after the engine is started
when oil pressure is available
Adjust valve clearance according to speci-
fication
Replace chain tensioner
Replace camshafts and/or cylinder head
Tighten or replace camshaft gears
Replace camshaft chain, chain guide or
chain tension guide
Replace piston or cylinder
Replace piston pin bore or piston pin
Replace piston rings broken or ring grooves
Replace the crankshaft
Replace the balancer shaft
Replace friction plates and /or clutch drum
Replace primary drive assy.
Replace clutch drum, clutch hub or pres-
sure plate
Replace primary drive assy.
Replace primary drive assy.
Replace springs and spring retainers
Replace ball bearing
Check gears and gear shafts, replace if
necessary
Replace bearings
C.6