Yamaha EF1000iS Service Manual page 87

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Check carburetor for
clogged passages or fuel
overflow.
GOOD NOT GOOD
Measure valve clear-
ance.
OUT OF
GOOD
SPECIFICATION
Check compression
using compression
gauge.
OUT OF
GOOD
SPECIFICATION
Check valve face and
valve seat for wear.
GOOD WEAR
Check if the marks on
the crankshaft and
camshaft are aligned.
GOOD NO GOOD
Check if there is seizure
or wear on the piston,
piston ring, or cylinder.
SEIZURE
GOOD
OR WEAR
Check the condition of the throttle control sys-
tem. Refer to "THROTTLE CONTROL SYS-
TEM".
ENGINE
6-2
TRBL
Replace.
Adjust.
Resurface
or replace.
Correct or
replace.
Rebore or
replace.
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