| Author |
Message |
    
Scott Seelye
New member
Username: 1941chriscraft
Post Number: 1
Registered: 08-2010
| | Posted on Wednesday, August 25, 2010 - 01:10 am: | 
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I have a 1941 Chris Craft with a 4 cylinder Grey Marine Model 620 [G9014]. We have been having trouble adjusting what we believe to be the fuel mixture from a small T-shaped screw on the carburetor. This screw is very loose, and has been tightening itself from the vibration of the motor. I have purchased a leather washer, which may help control this. Could someone let me know what this screw does, and what the screw with the spring above the T-screw does as well? Are there any other adjustments we should know about? Thank you in advance. |
Jim Staib
Senior Member
Username: drrot
Post Number: 63
Registered: 09-2008
| | Posted on Wednesday, August 25, 2010 - 06:29 am: |
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The small T handle which is usually lower on the carb is a high speed adjustment. There is screw up near the throat that adjust the idle mixture. |
Lawrence Wolfe
Member
Username: larry_from_md
Post Number: 18
Registered: 06-2010
| | Posted on Wednesday, August 25, 2010 - 07:55 am: |
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If you can't keep it from moveing by tighting the the jam nut, you can add a spring to it. |
Scott Seelye
New member
Username: 1941chriscraft
Post Number: 2
Registered: 08-2010
| | Posted on Wednesday, August 25, 2010 - 06:12 pm: |
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Thanks. I added a small o-ring to the nut this morning, and was able to adjust and keep the screw tight today. The boat would still run better when pulling the choke out today, so I kept turning the screw counter clockwise until the boat ran well, and I no longer saw a performance gain from pulling the choke. |
george doub
New member
Username: gdoub
Post Number: 1
Registered: 08-2010
| | Posted on Monday, August 30, 2010 - 08:38 am: |
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could anyone advise where i can buy a high speed needle valve & lock nut #10870 for for a zenith carburator #63m2e12 for a graymarine engine model 100 on a 1954 jafco? george doub |
mike mcintyre
Member
Username: tyeechaser
Post Number: 9
Registered: 08-2010
| | Posted on Monday, August 30, 2010 - 10:05 am: |
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Google up wisconsin motors and search through models. Go to Continental motors. There is a complete repair manual you can download. (Most 4 and 6 cyl grays are built on a Continental block). The repairn manual includes carb repairs and complete rebbuilds. Great resource.
Try weldmart.com for parts. They have a great selection. I just ordered a complete set of gaskets for a rebuild of a four-85. |
