Carbs or Ing Sys, Intermittent miss-fire Options

[Razorbobsr]

As you guys said, cleaned jets in carb, replaced plugs and wires, smooth at 900 rpms in drive, smooth at 2/3/4 K rpms in driveway, pulls hard W/O, sill I have a miss-fire that I can feel coming and going[surging, sound of engine when all 4 hit at proper times] Could I have a coil prob? Or where off to next?? 2L/carbs/5K sense rebuild/1500 miles driven to get this car home..... NKG plugs but do have Bosh plugs waiting...... Getting warmer outside, Help! Bob PS, British car friends are starting to make fun of the 914........... AND ME

[McMark]

On the mix screw
Turning in closes the the jet (less fuel and air)
Turning out opens the jet (more fuel and air)
the mix screw does not change the ratio of air to fuel, just the volume of it. The object of adjusting this screw is to get the cylinder to run smoothly on as little fuel and air as possible.

Zach, you're confusing two screws here. The idle mixture screws cange only the volume of fuel at idle. Screwing them in will make it run leaner, out is richer. This screw does not change airflow at idle. Right next to the idle mixture screw is an air bypass screw. This one has a lock nut on it and it changes that amount of air bypassing the throttle plate at idle. Screwing it out allows more air to pass, and in allows less. The air bypass screws need to be adjusted while the linkage is disconnected and with a UniSyn or Synchometer (better). The function of the air bypass screws is not to change mixture, but to equalize the air flow of the two throats.

You disconnect the bar by unbolting the drop links that go from the cross bar to the carb body. They are usually held on with small bolts (m4 or m5). Depending on the make of the bar, some have snap joints instead of bolts. Take a picture of your connection and we can help you out.

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