'98 ocean pro 150, carbs, needle valve settings, leaking fuel.

[Solarman]

Are low speed needle valves adjusted identically for all 6 carbs, or do they need to be adjusted using guages? Have an intermittent stutter at idle from one or two cylinders (will stall after a couple pops while shifting), think someone may have messed with settings (but not sure)?

Yes, motor has been sitting up for one year, used portable tank (main tank-bad fuel) for test run. Would only run pumping bulb continuously (when we found fuel leaking at filter screen o'ring), will replace filter screen.

Fuel filter O'ring (#0433190, $12) is not sealing - leaking

Is it possible the filter screen leaking could be causing us to have to pump bulb continously? Could that leak also affect motor at idle (cause of stutter stalling motor)?

Thanks for your help, Ralph

[Solarman]

Ok, replaced the 2 seals on the filter screen, though the o'ring doesn't feel like it does much good (too loose).

As I expected the bulb doesn't need to be pumped to keep the motor running, but am still having an occasional stutter/cough at idle that will stall the motor.

Still asking for a little directional help about air-mixture needle valves adjustments. Reading plugs indicates a slightly richer condition on top right cyl.

Have tried to download a manual, no luck as yet.

Thanks, Ralph

[Solarman]

Ok, so what i thought were needle valves were actually air jet orifices - not adjustable. Have cleaned all six, will clean & rebuild all six carbs with kits, if top right plug is still running rich.

Thanks for all the input.

[Joe Reeves]

Retired in 1991... No knowledge of the 1998 design, however.............

The cough/sneeze at the carburetor at idle is caused by a lean running carburetor. To determine which carburetor, when the problem is present, hold your finger over the idle air jet or your hand over a portion of the carburetor throat which would cause the engine to draw more fuel.

When the engine smooths out somewhat, you've found the offending carburetor.

Note that to enrich the flow of fuel through a "air" bleed jet... the jet ID must be smaller NOT larger.

[Solarman]

Thanks for the response.
That was my thought as well (cough/ sneeze - idle). However, i am believing there is a slight blockage in the idle fuel p***age(s) causing the lean condition.
My mistake was thinking the air irrigate jeers were needle valves.
Thanks again. Ralph.