225HP 2-Stroke restarting problem

[Robert_FL]

Once the engine is warm, the idle in gear is 600RPM +/- 100, out of gear it is about 800RPM +/- 100.

These numbers are when the boat is in the water. On the hose, it is higher.

[TownsendsFJR1300]

That sounds pretty normal..

Re the spit out and stall, IDK.. Someone else will have to chime in

My neighbors Yamaha 200, 2 stroke used to that, especially when cold did that, not so much once warmed up..

[rodbolt17]

that spit back is a backfire due to a lean condition in the crankcase.
it can blow pump diaphrams and in worst cases shear flywheel keys.
its an uncon*****ed explosion under the piston.
Yamaha does NOT recommend AGM or dry cell batteries on that motor.

[Robert_FL]

Thanks. I read that about the lean condition. I briefly adjusted the pilot screw to be more rich. I don't think I pumped the primer bulb though so it still happened so I reverted it to slightly lean within spec. I will double check again set to more rich .

I am going to continue to run those batteries, hard to get rid of $500+ in batteries.

Thanks,

Robert

[Robert_FL]

The Service manual says turn out the air adjusting pilot screw - 1 turn. +/- 1/4 turn.

At first I thought opening it up more made it lean. I talked to the mechanic where I store my boat, he said it is the more open, the more fuel (richness).

They recommended 1.5 turns open as a good starting point. So, I set it at 1.5.

Went on 2 trips and the boat started first try. Ran without pop or stall. Hit 5000 RPM.

Boat is running well. Thanks for the assistance here.