Carb question, need to dump little gas in carb just to get car started Options

[angerosa]

Seems that this year I need to put a little gas into the carb to get the car started initially. I have single Solex carb that no one seems to be able to identify. I'm sure some PO just pulled it off something that was sitting in a junkyard. Once I get car started and it warms up it idles OK but runs rough when you try to drive it. Timing is spot on. Recent (not too many miles ago) tune up with the help of some very knowledgeable 914world brethren. Let’s say it’s a given that there is nothing wrong with the engine. I have an idea of where to go next. I’ve had car for about 7 years. With only what I’ve told you here what’s your opinion?

[ThePaintedMan]

I agree with what Mike is saying. The longer intake runners on the Type 4 makes a single carb setup far from ideal, regardless of how the carb itself if setup. That being said, people have made them work for a long time, even if it is an imperfect option.

It sounds to me like when you open up the throttle like that, the secondary is providing too much fuel - similar to flooding. As Mike said, without an AFR gauge, you can't know for sure, but in that case, you would need to first identify the size of secondary main ets, then source one a size (or several sizes) smaller.

Adjusting the idle mixture won't make much of a difference, if any on the top end (or when you "punch" it). If the car is running rich at idle, you should be able to dial some of that out though.