123Ignition Static Timing, Engine will not start Options

[SteveNMaine]

I just setup my carbureted 2056 with 123Ignition distributor and cannot get it started.

Basics: Compression is good, new dual carbs and there is spark.

I have read several methods of setting static timing,

Method 1: 123 manual says set timing marks at 0 TDC and turn distributor till light turns green, I did that, no Joy.

Method 2: Set timing marks at 7.5 BTDC and turn distributor till light turns green, I did that, it sounded more like it wanted to start but no joy.

Should I continue to advance the timing?

[SteveNMaine]

The carbs are brand new; linkage is hooked up to both carbs and the accelerator pumps squirt fuel.

With the 123 programmed curve at 10 @500 and 28@3600 it will "chuff" at 1/2 to 3/4 throttle and the cranking rpm will increase very slightly like it is trying to start but that is it.

[Superhawk996]

The carbs are brand new; linkage is hooked up to both carbs and the accelerator pumps squirt fuel.

With the 123 programmed curve at 10 @500 and 28@3600 it will "chuff" at 1/2 to 3/4 throttle and the cranking rpm will increase very slightly like it is trying to start but that is it.

It sounds like carbs are aren’t set up properly. Please look into the things below before we go into carb setup.

The way you’re throttling it, you are effectively disabling the starting / idle circuit of the carbs but don’t have the engine “lit” and your not pulling enough airflow & vacuum to enable the main circuit.

Ian raised a very valid point to make sure you don’t have vacuum leaks at the heads or at the base of the carbs.

You should be able to start the engine with the throttles closed and pulling fuel exclusively off the idle circuits. Sometimes it may be necessary to use the throttle to shoot a couple shots of fuel to enrich the earliest cranking but even then I’ve usually cranked and started with the throttle butterflies closed or maybe only barely cracked open if the mixture is too rich.


Two asks:

1) try cranking it with the throttle completely closed and linkage disconnected. what happens?
2) post pictures of all 4 plugs