Pilot Screw adjustment

Andre54

New member
Hello All
Reading my service manual for Yamaha50 2 stroke 1996 model.
The pilot screw adjustment says:

Pilot Screw (turns out):
50 HP(M Model) 1-5/8 +- 1/4.

What does this mean? 1 and 5/8 turns out with 1/4 adjustments at a time???

Thank you
Regards
 

willem wikkel spies

Moderator
Staff member
the best advise I would give you is to work on 1,75 turns out from lightly seated.

it might be a rich setting, but at least there is no risk of running lean.

making adjustments should be 1/8 at a time.

so divide the circle in 8 pieces and make adjustments at one piece at a time.

the last thing, the recommended setting is only a base setting/ and also a safe setting.

something else.
on the two stroke model airplane engines we would when running a bigger prop have a richer mixture.
a smaller prop a leaner mixture.
 
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