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tubman · 10-24-2021, 05:59 PM

When you say you are "only running off the primary", what exactly do you mean? Did you actually block them off, or just disconnect them. Since we don't know much about the end carbs, I think the best thing to do at this time is to completely eliminate the end carbs from the equation and try to get it running on one, either by temporally substituting a stock manifold or actually making block off plates to put under the end carbs.

It can be tough enough to get one of these to run right with a single carb much less trying to solve the problems that may be caused by a multi carb setup you know nothing about.

Also, what kind of distributor are you running? One of the first things you should know is that the engine will never run right with a stock distributor and multiple carbs, especially if you are using 97's.

10-24-2021, 05:59 PM	#2
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,303	Re: Flathead won't idle When you say you are "only running off the primary", what exactly do you mean? Did you actually block them off, or just disconnect them. Since we don't know much about the end carbs, I think the best thing to do at this time is to completely eliminate the end carbs from the equation and try to get it running on one, either by temporally substituting a stock manifold or actually making block off plates to put under the end carbs. It can be tough enough to get one of these to run right with a single carb much less trying to solve the problems that may be caused by a multi carb setup you know nothing about. Also, what kind of distributor are you running? One of the first things you should know is that the engine will never run right with a stock distributor and multiple carbs, especially if you are using 97's. Last edited by tubman; 10-24-2021 at 06:35 PM.