Husqvarna 2009 TC 250, Workshop Manual, Page: 146 / 420

G.10 Part. N. 8000 H1489 (10-2009)
ENGINE OVERHAUL
Camshaft
Check the contact faces of the lobes for streaks, scoring, dents and waviness.
Clamp the camshaft between centres and check deviation using two dial gauges.
Service limit: 0.1 mm. Check that the lobes are in pristine conditions, without
signs of scoring or distortion.
STANDARD "L" SERVICE LIMIT
140 mm 142.5 mm
(5.51 in) (5.61 in)
Timing chain and gears
At each engine overhaul, check gear teeth and chain rollers for wear. If gear
teeth are badly worn, change both gears and the chain. Hold the chain taut to
take out any slack and measure across 20 links (21 pins).
If any one gear or the chain is worn beyond the specified limit, replace both
gears and the chain as a set.
Timing chain tensioners
Chain tensioners (1) must be replaced when the wear material is worn out.