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Old 12-02-2017, 11:54 AM   #37
VWNate1
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Join Date: Feb 2012
Location: So. Cali.
Posts: 2,608
Post 1 barrel Rochester carb Adjusting

O.K., looks like you're on your way .

Me, I'd install the HEI dizzy before anything else, unless it pings when you stamp the throttle, set the base timing to 8° ~ 10° BTDC, idle speed below 800 RPM ~ then connect the vacuum advance hose whilst looking at the timing~ if it jumps forward, you have the wrong hose nipple on the carby ~ it shouldn't get any vacuum advance until you open the throttle .

If you're running points, do you have a dwell meter ? if so, remove the spark plugs and crank the engine, cap and rotor off, adjust the points gap to 33°, this is the first step in points ignition .

Then gap the plugs to .035 (points) and re install them .

Once this is all done, stop the engine and look down the carby through as you gently work the throttle : the *instant* you move the throttle it's critical to have a solid if tiny spray of fuel out the accelerator pump jet ~ if it doesn't,take the carby apart and blow out the jet well, there's a BB in there that's finicky about tiny dust on it .

Now : engine off, turn the key on and see if that solenoid makes a 'click' and moves out a bit .

If so, you're on the right track, engine idling warm, back it off until there's a visible gap and then use the idle stop screw on the carby to set a 500 RPM idle .

Idling super slowly and maybe a bit roughly now ? fine ~ use the idle solenoid to raise up the hot idle to 800 ~ 1,000 RPM's , what happens is : that solenoid sets your idle and when you shut the key off it goes in and prevents the hot engine from dieseling .

As long as the key is on the engine should _barely_ idle with the solenoid disconnected .

I hope this helps, you have a GREAT carby there, keep at it remembering to FOLLOW THE STEPS IN THE CORRECT ORDER else you'll chase your tail forever .

Think of tuning like a clock ~ 11:59 is when you touch the carby and NOT BEFORE ! .

Everyone hears the carby popping and so touches it first, this is dead wrong every time .

Remember ; any HEI dizzy NEEDS A FULL 12 VOLTS and the original yellow coil power wire doesn't provide that .
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'49 3100 235 W/ Muncie SM420 SOLD
'69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH
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