new to me 1974 FST

[Gotta40]

Is there a carb jet chart for different altitudes? I think we're 800ft here. I need to pull the jets and see what's in there I guess. I know theres spares in the plugs.

 

[charliemeyer007]

No clue. I would consider 800' as sea level on a high pressure day.

 

[RevISK]

Is there a carb jet chart for different altitudes? I think we're 800ft here. I need to pull the jets and see what's in there I guess. I know theres spares in the plugs.

Yes, there are different jets for higher altitudes. But, above 8,000 is maybe when you should start considering re-jetting.

 

[Gotta40]

its got a 1.18 in the main jet, which is stock for a f. since its a 2f with a header, shouldn't it be a bit richer jet? seems like the 75/76 carbs ran a 1.44 jet.

 

[Pighead]

might need to do some research about venturi sizes and how that relates to jet sizes...

Post in thread 'Federal vs. calif carb differences?'

Jan 21, 2024

136 is too big for that carb, it will cruise at 12AFR dropping to 10AFR when the PV opens.

• FJ40Jim

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[pb4ugo]

Run it and read the plugs. They'll tell you what it needs.

 

[Gotta40]

Drilled an extra jet out to the next bit size up. Runs like a top now.
Also spent some time painting the windshield frame and top. Still need to try and get more of the black off the body but that will take some patience.