Cylinder Head - Yamaha JT1 Series Service Manual

ENGINE·
Cylinder Head
13 Remove the engine from the frame.
Fig 3-1-15
3 -2 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 rernsta!lation, Replace the gasket. if damaged or in questionable condition.
(10 mm)
Note: During reassembly the head bolts must be torqued to 90 rn/lbs rn pattern, and in successive stages. Do not
torque a hot engine and for most accurate readings_ place a small amount of light we;ght oil on the threads first.
Fig 3-2-1
8 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 pre-
ignition and engine overheating .
Scr~pe the cylinder head and piston dome clean.
Use o rounded scraper to ovoid damaging the olumi•
num.
Fig 3-2-2
Fig 3-2-3
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