First drive running rough, 2.0 weber 40's |
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First drive running rough, 2.0 weber 40's |
skota23 |
Feb 20 2023, 09:10 AM
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#1
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Newbie Group: Members Posts: 35 Joined: 28-November 22 From: Madison, WI Member No.: 26,993 Region Association: Upper MidWest |
Hi Folks,
I was able to take my new to me 914 for a short drive yesterday. The car is a 74 with what I think is the original 2.0. It has Dual weber 40's and what I think is the stock distributor. The cap and rotor look practically new and the plug wire in good condition. It wouldn't start a few weeks ago and I pulled the plugs (NGK 7) and cleaned them, fired right up after that (Never had webers before and I think I flooded the cycling a little pumping the gas pedal thinking it would help start. Other observations. The few times I have started it (usually after sitting over a week) I crank the engine, and give a dab of the gas pedal to get it to fire, usually takes several tries to get. running. After warming up a bit engine goes through revs well. On the drive the engine runs very rough usually between 2-3k its barely pulling. Lots of hesitation and at odd times it pops to live a pulls great. My first thought is to pull the carbs, do a thorough cleaning and check to see what jets are fitted and the condition of the floats. Also planned are a timing check, valve adjust, oil and filter, fuel filter. Is there any other details I can provide for suggestions on how to get things running well? (IMG:style_emoticons/default/poke.gif) Thank you! Steve Attached thumbnail(s) |
nditiz1 |
Feb 26 2023, 07:54 PM
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#2
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Senior Member Group: Members Posts: 1,190 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
You could upgrade the FP to a CB rotary which will consistently deliver the proper amount of pressure. It will also clean all 3 of those items shown as it also comes with a fuel filter in line.
You should be good to start with the 28s. It will give you the easiest time dialing it in. Once you have a consistent AFR from cruise to WOT then you can adjust you power band by moving up in venturis. Only other suggestion is to upgrade the Dizzy with a pertronix Svda. The advance will definitely help smooth transition from rest. Only thing better than that is a 123ignition. I'm think of building a kit to help others dial in their carbs. I have several jets and vents. Try out the different ones. Find the set that makes it work and send the kit back. |
Superhawk996 |
Feb 26 2023, 08:48 PM
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#3
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914 Guru Group: Members Posts: 5,876 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
You could upgrade the FP to a CB rotary which will consistently deliver the proper amount of pressure. It will also clean all 3 of those items shown as it also comes with a fuel filter in line. You should be good to start with the 28s. It will give you the easiest time dialing it in. Once you have a consistent AFR from cruise to WOT then you can adjust you power band by moving up in venturis. Only other suggestion is to upgrade the Dizzy with a pertronix Svda. The advance will definitely help smooth transition from rest. Only thing better than that is a 123ignition. I'm think of building a kit to help others dial in their carbs. I have several jets and vents. Try out the different ones. Find the set that makes it work and send the kit back. (IMG:style_emoticons/default/agree.gif) Man a tuning kit would be the cats pajama’s. I was always torn between 28 mm venturis (great day to day driveability on a 1911cc with a moderate carb cam) and the 30mm venturis that opened up the top end (4700 RPM+) but at the expense of initial tip in response. You’re in a great place. I was afraid you’d find 32’s or something even bigger. |
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