115 hp 2stroke yamaha

[Kooch]

Hi guys I have a 2001 crestliner with a yamaha 115 2 stroke. It starts hard and needs choke even when warm . After it starts it feels like its starving for fuel at low rpm. When pulling into a dock she stalls out. Carbs were rebuilt last year and tank gone through. Any suggestions? Thanks

Edited August 8, 2018 by Kooch

[Earl28]

Sound like an air leak on the intake side. When did this start.

[Kooch]

Early this year. Had it out at chautauqua lake and it was fine. The next time I started it to move to a different  spot it ran bad. Once the rpms are up it runs ok.

Edited August 8, 2018 by Kooch

[Earl28]

I thick you have a small air leak. Check vacuum lines, gasket and carb mounting bolts and assembly screws.

[VandooChris]

47 minutes ago, Earl28 said:

I thick you have a small air leak. Check vacuum lines, gasket and carb mounting bolts and assembly screws.

Agree, and check you fuel filter as well, I mean the water separator filter. 

[Frogger]

If you don’t find anything in the fuel side, being a 2001, not sure how many hours on it, you might want to do a quick compression check on the cylinders. Hopefully it’s something simple as mentioned above.


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[CatskillBob]

I would check LP fuel pumps for pinholes. Yamaha's are known for failing. They are easily rebuildable for less than 20 bucks per pump for the diaphragms. 

 

if you figure it out please circle back with your results. Thanks

[Kooch]

Hi guys , changed out fuel and lp pump . Runs good so far. Started much better and idle is good . Thanks for all the advice .

[kontiki]

i have a 2002 90hp 2 stroke yammy and i run lucas fuel system through the fuel a couple of times during the year, it lubricates and removes carbon from the rings. been doing this for years with not a hickup.   i run that sh*t through all my equipment including autos.  it really does work  just my 2 cents.

[JAYRFRED]

As an additional check, did you replace all your fuel lines that the Ethanol has deteriorated?

Barricade by Gates is a great fuel line that the Ethanol can't melt