25HP '93 Johnson, lean sneeze---VIDEO---

[Tucker99]

This is the video from another post, hoping to get more ideas. Engine is linked & sync'e to the FSM, carb rebuild, new plugs, wires, stat. Idle screw is 1-3/4 turns out. I can't get rid of the sneeze and sometimes it coughs and stalls. Any ideas guys??

https://www.youtube.com/watch?v=qbV4Nt5Uw88&feature=youtu.be

 

[oldboat1]

You found low compression, didn't you? Think you should see something around 120 lbs.

1 3/4 out is the correct initial setting for the idle needle. Adjustment for a richer setting is 1/12 rotation c.clockwise, letting the motor catch up between adjustments. On the boat is best. In a test barrel is second best. On muffs is a waste of time.

Spark measurement is done with an open air tester, not the inline type.

BTW, is the nozzle gasket in place?

 

[flyingscott]

Do.you have a 3/8" gap on the throttle rod under the flywheel. What is. your compression

 

[werewolf30]

I just did a 15 hp 93 model that was doing that and found head gasket seeping water in cylinder causing a miss fire when hot

 

[GA_Boater]

Old thread and closed