Yamaha F115: engine knock

loyoki

Seaman Apprentice
Joined
Mar 23, 2009
Messages
47
Hi,
I have idle trouble with my F115, it starts up at 900RPM (not 700rpm like before) and
randomly it comes to 600-700RPM and then I heard an acute knock and there is dark exhaust smoke.
It seems it is like ignition advance.
Could be ISC is faulty or another problem ?
Many thanks for your help.
Lo?c
 
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