Cylinder Head Assembly - Honda TRX70 Fourtrax 1986 Service Manual

CYLINDER HEAD/VALVES
Apply a thin c08ting of Prussia" Blue to the valve seat.
Without rot8ting the v81ve, insert it through the valve guide
and onto the seat 10 make 8 clear pattern.
NOTE
The location of the valve seat in relation to the valve face is
very important for
good
sealing.
If
the contact area is too high on the valve, the seat must
be
lowered using 8 32° flat cutter.
If the contact area is toal low on the \/alve , the seat must be
raised using a 60° inner cutter .
Refinish the s8at to specifications using a 45° seat cuner.
After cuning the seat, apply lapping compound to the valve
face and lap the valve using light pressure.
NOTE
Take care not to allow the compound to enter between the
valve stem and guide.
After lapping. wash all residual compound off the cylinder
head and valve.
CYLINDER HEAD ASSEMBLY
(11
(2)
AETAINE A
OUTEA SPAING
(1)
CONTACT TOO HIGH
~
:J;ATW( O TH
(3)
CONTACT TOO lOW
(21
~
=1SEATW(OTH
(6) SEAL
(9) INN'./
SPAING
VALVE GUIDE
(8) (NNER
SPFIING
SEAT
Install new valve stem seals into stem seal caps.
lubricate each vslve stem with molybdenum disulfide grease
and insert the valve into the valve guide .
NOTE
Install1he new valve stem seals when assembling.
To 8void damage to the stem seal, turn the valve slowly
when inserting .
Install the v81 ve springs and retainers.
6 -10
(4) VALVE
•