Yamaha ox66 will not idle

Joined
Mar 19, 2019
Messages
3
Ok fresh rebuild on power head ..comple co fuel system overhaul new lift pumps vst s reencinjectirs serviced everything check fine on electronics ....once motor is run a while it will not idle it chugs and dies and smells very very rich once you fire it up with a little throttle it runs great except trying g to idle
 

scoflaw

Ensign
Joined
Jun 2, 2010
Messages
962
Check it with the winky/blinky ? Does it respond to turning up the idle screw ? Has the O2 sensor been cleaned and tested ?
 

scoflaw

Ensign
Joined
Jun 2, 2010
Messages
962
could be a failed O2. Inexpensive replacement is ngk/ntk 21006. Sensor needs to be tested at all rpm's in a running engine. Bench testing is useless
 
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