Trouble starting Yamaha f40bet carb version

[Disschord]

Hi I am having trouble starting my yamaha f40bet it's the carb version

The engine has trouble starting it turns over without firing for ages.
I turn her over for 5 seconds at a time then leaving her for a while and repeat.
After 5 or ten minutes of this she will start to fire then after a while longer she will run but rough.
Once warmed up she runs fine and will run fine all day but come back tomorrow and I'm back to square one.

I always use fresh fuel and run the carbs dry when done.

I checked the plugs they are fine but changed them anyway.
All 3 plugs are sparking fine.

Any ideas what I should look at next?

Many thanks

[Wightdiver]

Originally Posted by Disschord

Hi I am having trouble starting my yamaha f40bet it's the carb version

The engine has trouble starting it turns over without firing for ages.
I turn her over for 5 seconds at a time then leaving her for a while and repeat.
After 5 or ten minutes of this she will start to fire then after a while longer she will run but rough.
Once warmed up she runs fine and will run fine all day but come back tomorrow and I'm back to square one.

I always use fresh fuel and run the carbs dry when done.

I checked the plugs they are fine but changed them anyway.
All 3 plugs are sparking fine.

Any ideas what I should look at next?

Many thanks

Don't know that specific engine but I had a similar experience with my old yam 60. Had the carbs balanced, problem sorted.

Good Luck

[Nightfisher]

Seems to me, a good place to start looking is the cold-choke setting. Good luck.

[matt h]

auto choke. think its situated on the middle carb if I remember