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manual primer 1985 20hp

newyota

Regular Contributor
Amazing the things that are learned when buying a used motor.Until looking at parts diagram and pictures I realized the knob on my manual primer was missing the Red O-ring.I was wondering why the decal showed Red on the knob?Is it just to denote where to put the knob when priming or to keep it from drawing air in or both?
 
I did get some info on how it is supposed to work.Never saw one before.So I guess the o-ring serves no sealing function?Now I just need to verify it is working properly in all positions.Did see it spray fuel out in carb. by using a flashlight when I figured it out.
 
I think you are supposed to pull the primer knob all the way out.
Then, push it in until the red o-ring just shows. When the engine
warms up, push it in the rest of the way.
 
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