Booxt 2007 GOES 300 S, Service Manual

Page: 70 / 188

ENGINE
PISTON RING INSTALLED GAP
1. Place each piston ring inside cylinder using piston to
push ring squarely into place as shown.
Piston Ring Installed Gap
Top Ring
Std: 0.1--0.3 mm
Limit: 0.8 mm
Second Ring
Std: 0.35--0.5 mm
Limit: 1.0 mm
Oil Ring
Std: 0.2-0.7 mm
Limit: 1.5 mm
2. Measure the gap with a feeler gauge at both the top
and bottom of the cylinder.
NOTE: Measure at two points in the cylinder
A difference in end gap indicates cylinder taper.
The cylinder should be measured for excessive taper
and out of round.
3. If the installed gap measurement exceeds the limit,
replace the rings. If using new rings and the
measurement is too small, file the ring ends to achieve
the proper gap.
NOTE: Always check piston ring installed gap after
re-boring a cylinder or when installing new rings. A
re-bored cylinder should always be scrubbed
thoroughly with hot soapy water, rinsed, and dried
completely. Wipe cylinder bore with an oil rag
immediately to remove residue and prevent rust.
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