How can I determine whether my piston is reusable so as to replace just the piston rings?

The most common problem of a piston that needs replacement is in case there are scratches on its body.

What other parts I may need to replace when replacing the piston rings?

To replace the piston rings you need to disassemble the engine, so you also need to replace the cylinder gasket.

$6.96

In stock

Piston Ring for HOMELITE Blowers, String Trimmers, Pumps [#96935]

This listing is about a brand new after-market top-quality Piston RingTips for safely installing piston rings made by the well-known OEM firm CABER (Italy), and fits the following HOMELITESpare Parts for HOMELITE machines models, and replaces OEM Part #96935:

Specifications
Country of Origin	Italy
Product Code	1032039
Compatible Brand	HOMELITE
Compatible Models	HOMELITE ST285BC, GST18, HLT17C, ST385C, i725cc, GST, ST485, ST285, bc730sbr, HBC28, HLT18, i630cd, BP250, ST385BC, ST385, HLT28, s825cdv, s825sdv, s825sev, BC3000, i625cd, HBC18, HB180V, HB180, HB100, GSTBC, i725ce, ST275, d730cdv, i730cc, ST175, d830sd, ST175C, d830sba, d830sb, ST175BC, HBC30B, d830cd, d830cb, d630cd, ST175G, ST155, AP125, HLT16, HLT15, HGT, HBC30, ST185C, ST185BC, ST145, ST185, i725cea, i730ca, d830ca
OEM Part #	96935