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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 22nd February 2019
JSH JSH is offline
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Default 1979 XLH Carb

What is the best new replacement carb for an old Ironhead nowadays? Opinions?

And is my old worn-out Keihn a 38mm or a 40mm?
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Old 23rd February 2019
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34mm if I remember correctly. That's the year they went down from 38mm.

They are good carbs, I might rejet and rebuild. Save a lot of bucks, anyhow.
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Old 23rd February 2019
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I had a screamin eagle racing carb put on my '73xlh on recomendation from a local Indy who was also pres of an MC at the time. Really knew the older bikes. He set it up and I have to say the thing just screamed. Perfect color on the plugs thru out too.
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Old 23rd February 2019
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Quote:
Originally Posted by JSH View Post
What is the best new replacement carb for an old Ironhead nowadays? Opinions?

And is my old worn-out Keihn a 38mm or a 40mm?
If you just wanna make her into a rider again just rebuild the one ya got,
I rebuilt the Keihin butterfly on my 82 xls and it runs great, besides burnin alittle oil but that’s my issue.
Just make sure there’s not a lot of slop/play in the throttle shaft (source of vacuum leak) and she should be a good core for a rebuild, kits are cheap, save yourself alittle $.

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Old 23rd February 2019
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When the throttle shaft on my old butterfly got to loose to hold a steady idle i shit canned it and put on a CV.
It's much better all around, starting, riding, tuning, mileage, and parts are everywhere for them as well as upgrades.
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Old 23rd February 2019
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Quote:
Originally Posted by iNSaNeSHaNe View Post
When the throttle shaft on my old butterfly got to loose to hold a steady idle i shit canned it and put on a CV.
It's much better all around, starting, riding, tuning, mileage, and parts are everywhere for them as well as upgrades.
nice to know that's possible, i wasn't sure tbh.
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Old 23rd February 2019
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the vm38 round slide mikuni is a popular replacement, simple but effective!
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Old 23rd February 2019
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All above are good suggestions. As far as spare on the shelf carbs go. My fav is s&s super b.

KISS is pretty hard to beat.
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Old 26th February 2019
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I’ve got a S&S Super E on my ‘79. I dig it because it looks cool and it’s so simple and easy to work on and tune. A lot of Ironhead guys seem happy upgrading to the CV 40 carbs which is more cost effective than the S&S. I’ve had both on different bikes. Both will do the job.
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