TKS 3.0 hard start after sitting 30-180mins

[Willy.Fire]

Hi. After running my new to me 2009 boat with 3.0 multiple time this year everything has been great except the following.
1st start of day - 1 crank always fires up (classic hissing 5-8 mins)
Engine at full temp - 1 crank fires right up

*Problem* After sitting at anchor for 30 plus minutes Cranks but won't fire unless I give it 1/2 throttle.
-after start if i place in neutral rpms will drop and it will stall
-once up to full temp all is back to normal

So any thoughts? I can live with it as I can let it idle while pulling anchor but a fix would be nice. My thoughts are the idle mixture screw (don't have the tool). But if i mess with this will I cause problems with the cold start or hot starts that work great? Also does this have to be performed in gear on the water to been done 100% correctly? It idles at about 800-850rpm when warm 1000rpm when cold start. It has dieseled a few times when shutting off after running full temp but i usually let it sit and idle so has only done it a few times. Im fairly new to this but have been learning every day. Thanks for any help.

 

[alldodge]

Hi. After running my new to me 2009 boat with 3.0 multiple time this year everything has been great except the following.
1st start of day - 1 crank always fires up (classic hissing 5-8 mins)
Engine at full temp - 1 crank fires right up

*Problem* After sitting at anchor for 30 plus minutes it wont turn over unless I give it 1/2 throttle.
-after start if i place in neutral rpms will drop and it will stall
-once up to full temp all is back to normal

So any thoughts? I can live with it as I can let it idle while pulling anchor but a fix would be nice. My thoughts are the idle mixture screw (don't have the tool). But if i mess with this will I cause problems with the cold start or hot starts that work great? Also does this have to be performed in gear on the water to been done 100% correctly? It idles at about 800-850rpm when warm 1000rpm when cold start. It has dieseled a few times when shutting off after running full temp but i usually let it sit and idle so has only done it a few times. Im fairly new to this but have been learning every day. Thanks for any help.

Sounds to me that you carb is flooding and needs rebuilt. Your saying it "won't turn over" when I think you meant it will turn over but will not start unless giving it 1/2 throttle.

 

[Willy.Fire]

Yes that is corrects. Edited. I'd hate to mess with the carb unless I'm 110% sure that's the problem because like I say it runs and starts great otherwise