RonaldJJames
Recruit
- Joined
- Jul 11, 2019
- Messages
- 1
I've just cleaned the carb on my yamaha 9.9 four stroke. Previously, it ran fine with throttle open but would idle very poorly and died when throttle opened or shifted into gear.
Cleaned the carb, found the choke and butterflies (throttle and choke) gummed up with brown stuff. Also a fair amount of brown dirt in the bowl and some holes blocked. Dismantled both butterflies and cleaned them and choke tubes, and cleaned carbs and all jets and fuel holes.
Pumped a pint of fuel into a bowl prior to connecting the carb and fuel clean.
It now runs a lot better, but idles barely. It shifts into gear OK now, and also responds to opening the throttle wide from Idle. However, I'm pretty sure its idling too slowly since it's very lumpy and dies after a short time (Don't have a tacho). The idle screw is turned fully in against the spring.
Is something worn? The engines are 10 years old.
Is there a mixture screw somewhere?
Is it possible the timing has gone off after 10 years (although it runs great with throttle open).
Any other thoughts?
Thanks in advance
Ron James
Cleaned the carb, found the choke and butterflies (throttle and choke) gummed up with brown stuff. Also a fair amount of brown dirt in the bowl and some holes blocked. Dismantled both butterflies and cleaned them and choke tubes, and cleaned carbs and all jets and fuel holes.
Pumped a pint of fuel into a bowl prior to connecting the carb and fuel clean.
It now runs a lot better, but idles barely. It shifts into gear OK now, and also responds to opening the throttle wide from Idle. However, I'm pretty sure its idling too slowly since it's very lumpy and dies after a short time (Don't have a tacho). The idle screw is turned fully in against the spring.
Is something worn? The engines are 10 years old.
Is there a mixture screw somewhere?
Is it possible the timing has gone off after 10 years (although it runs great with throttle open).
Any other thoughts?
Thanks in advance
Ron James
