Husqvarna 2009 TC 250, Workshop Manual, Page: 139 / 420

G.3 Part. N. 8000 H1489 (10-2009)
ENGINE OVERHAUL
Cleaning parts
All parts must be cleaned with gasoline and dried with compressed air.
Flammable vapours develop during this procedure and metal filings blown by compressed air may get into your eyes.
Perform this procedure away from open flames or sources of ignition and wear an eye protection.
Clearances
To ensure the best operating conditions and maximum performance, all clearances must be within the specified tolerance. A tight fit will
lead to seizure as moving parts heat up, whereas a loose fit will cause annoying vibration resulting in early wear of moving parts.
Cylinder head
Remove fouling deposits from the combustion chamber using a rounded scraper.
Do not use sharp tools or you might damage valve seats and spark plug thread.
Check the machined surface of the cylinder head for warpage using a straight-edge and a feeler gauge at the positions shown in the
figure. If warpage exceeds the service limit at any one point, grind the cylinder mating surface. Head warpage: service limit 0.05 mm
(0.0019 in.).