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Old 15 September 2015, 06:35   #1
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Trouble starting Yamaha f40bet carb version

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
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Old 15 September 2015, 06:55   #2
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Quote:
Originally Posted by Disschord View Post
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
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Old 20 September 2015, 07:44   #3
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Seems to me, a good place to start looking is the cold-choke setting. Good luck.
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Old 20 September 2015, 07:47   #4
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auto choke. think its situated on the middle carb if I remember
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