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1964 pan carb

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Posts: 1
Joined: Sun Sep 05, 2010 1:50 am
Bikes: 1964 panhead
Location: idaho falls,idaho

1964 pan carb


Post by hiatt » Tue Sep 07, 2010 1:50 am

I just built my 64 panhead out of boxes and milk crates it was my dads and I want to keep it how he had it but it has an S U carb on it and it runs rich and I had an old timer other than my dad tell me I would burn my eng up with that carb can I rebuild the carb and make it work or do I need to up date

Posts: 6911
Joined: Mon Aug 26, 2002 9:09 am
Location: Central Illinois

Re: 1964 pan carb


Post by Cotten » Tue Sep 07, 2010 3:09 am


There's no such thing as a bad kind of carburetor.
Just worn originals, or over-complicated updates.

You would be back-dating to get an original M74B.

However I suspect the reason that you are running rich is not the carb.
Commonly, running rich is a result of a vacuum leak that demands that the carb be over-enrichened, or it won't run at all.

Before you chase your tail or throw money at it,
I suggest a simple test for vacuum leaks as described at http://virtualindian.org/11techleaktest.html

And please squirt soapy water upon both of the pan cover screws over each intake port as well, as occasionally they have poked through.
(And wash the soap off thoroughly of course...)

Let us know how it goes,


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