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Cylinder Head; Cylinder - Yamaha GT1 Service Manual

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ENGINE -
Reed Valve · Cylinder Head · Cylinder
3)
Remove the reed valve ass'y.
Fig. 4-2-3
4-3.
Cylinder Head
The cylinder head is bolted on the cylinder with special
nuts.
A.
Removing
Remove the four special nuts from the top of the
cylinder head, then the head and head gasket.
Reverse the sequence for reinstallation.
Replace
the gasket, if damaged. Cylinder head tightening
torque is
15 -18
ft-lbs.
(2.0 kg-ml
Note:
The special nuts should be loosened {and
tightened) in a cross pattern and in
progressive stages.
Fig. 4-3-1
Fig. 4-3-2
B.
Removing Carbon Deposits
Carbon deposits on the cylinder head combustion
chamber and top of the piston will result in an
increase in the compression ratio, as well as
preignition and engine overheating.
ScraPe
the
cylinder head and piston dome clean.
Fig. 4-3-3
4-4.
Cylinder
The Yamaha GT1-GTMX engine employs a special cast
iron cylinder.
The cylinder is of 5-port design with superior scavenging
efficiency.
-20-
A.
Removing the Cylinder
1 I
Remove the cylinder by striking it lightly with
a plastic or rubber hammer.
Fig. 4-4-1

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