1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 68Get this manual
CYLINDER HEADCYLINDERPISTON Align each ring end gap with the piston ring stoppers in the ring grooves
Lubricate he piston with 2-stroke oil and slip the cylinder over the piston while compressing the piston ringsCAUTION
Do not rotate Ihe cylinder, since this may cause the piston rings to snag cylinder port and break
Install the cylinder base nutsTORQUE: 38-48 Nm (3.8-4.8 kg-m, 27-35 ft-Ibl NOTE Tighten the nuts in crisscross pattern in or progressive steps