Piston Rings; Piston Ring To Cylinder Clearance - Husqvarna TC 250 2010 Workshop Manual

Piston rings

They should show no signs of forcing or scoring.
Replacement pistons come with piston rings and piston pin.

Piston ring to cylinder clearance

Insert the piston ring at the bottom of the bore (where minimum wear occurs)
taking care to position it squarely and measure end gap.
Piston ring to cylinder clearance
PISTON RING MOUNTING CLEARANCE (H)
"A"
(0.00591-0.01182 in.)
"B"
(0.00788-0.02758 in.)
Part. N. 8000 H1489 (10-2009)
ENGINE OVERHAUL
0.15 -0.30 mm
0.2-0.7 mm
SERVICE LIMIT
0.45 mm
(0.01773 in.)
0.85 mm
(0.03349 in.)
G.13