1998 Yamaha 115 2 stroke - Advice on pilot screw adjustment

[BOAH]

I have a 98 Yamaha 115 2 stroke that I bought used. It seemed to be running rich because of what I thought was excessive smoke. I read up on adjusting the pilot screw and according to my manual, it says that all four should be anywhere from 3/8 of a turn to 7/8. When I checked what they were currently at, they were at 1 1/2 turns which according to the manual would be extremely rich. So I picked the middle of the recommended settings and set them at 5/8 of a turn. Helped with the smoke for sure. Seems to run well at higher speed but I think the idle was kind of rough so I turned them to 3/4 of a turn. With that setting, I don't notice a big difference.

Also, it definitely runs different on the muffs than in the water. I would like to make the adjustments while I'm on the water but I've found I need to take off the air baffle to get at them.

Is there a post somewhere that will detail how to dial in those settings?

Thanks

 

[Doh]

Smoke and Rich on a Oil Injected Yamaha are 2 different things. The Pilot Jets should be 1 1/2-2 turns out.

Smoke is due to Oil Injection or Premix which is Rich at Idle.

 

[BOAH]

The manual is clear that on the 115, the pilot screw is 3/8 to 7/8

 

[boscoe99]

The base setting is 5/8th turn out from being lightly seated. Then plus or minus 1/4 turn if needed to help the idle quality.

The idle RPM adjustment and the idle mixture settings should be performed with the boat in the water.

 

[Doh]

The manual is clear that on the 115, the pilot screw is 3/8 to 7/8

Go by the Manual then. 20 years running a 130 V4 Yamaha @ 1100' Above Sea Level, taught me different. In fact, All my Yamahas are/were Cold Blooded @ idle. 30hp, 50hp and 90hp. and smoked at idle also.

 

[BOAH]

Thanks. Will do.

 

[99yam40]

specs are at sea level

 

[boscoe99]

"The manual is clear that on the 115, the pilot screw is 3/8 to 7/8"

What manual says this? It is not a Yamaha service manual. The Yamaha manual is clear that the setting is 5/8ths.