Polaris Sportsman 400, Service Manual

Page: 104 / 381

ENGINE
3.35
VALVE SEAT RECONDITIONING, CONT.
10. Insert the valve into its respective guide and lap using
a lapping tool or a section of fuel line connected to the
valve stem.
11. Rotate the valve rapidly back and forth until the cut
sounds smooth. Lift the valve slightly off of the seat,
rotate 1/4 turn, and repeat the lapping process. Do
this four to five times until the valve is fully seated, and
repeat process for the other valve(s).
12. Clean cylinder head, valves, and camshaft oil supply
passage (A) thoroughly.
13. If oil passage blind plug was removed, apply 3 Bond
1215 or equivalent sealer to the threads and install,
torquing to 8 ft. lbs. (1.1 kg-m). CAUTION: Do not
allow sealant to enter oil passage.
14. Spray electrical contact cleaner into oil passage and
dry using compressed air.
CYLINDER HEAD ASSEMBLY
CAUTION: Wear eye protection during assembly.
NOTE: Assemble the valves one at a time to maintain
proper order.
1. Install new valve seals on valve guides.
2. Apply engine oil to valve guides and seats.
3. Coat valve stem with molybdenum disulfide grease.
4. Install valve carefully with a rotating motion to avoid
damaging valve seal.
A