Tillotson HD-5A

Classic short-frame models

Tillotson HD-5A

Postby Otis » Thu May 28, 2020 12:51 pm

Can anyone identify a tillotson HD-5A? Looks like the HD-1 series but doesn’t have an accelerator pump. Possibly a racing carburetor?
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Re: Tillotson HD-5A

Postby thefrenchowl » Thu May 28, 2020 2:49 pm

Can't go wrong for ident, it is stamped on top of the flange.

Does not have the choke axle bore machined, plus on the underneath, outside, steel cover for diaphragm and no accelerator pump.

On factory bikes, venturi remachined at HD.

On twin carb factory bikes, the front one has no idle adjustment.

Patrick
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Re: Tillotson HD-5A

Postby Otis » Thu May 28, 2020 5:34 pm

All the things you said are what this carburetor has so let me rephrase my question; what did this come on originally?
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Re: Tillotson HD-5A

Postby thefrenchowl » Thu May 28, 2020 6:00 pm

It's part number 27155-66RA and is listed as 1967 and later KR, KRTT, XLR-TT and early iron XRs till 1971

Before that, there was a race kit available to modify the std Sportster Tillotson

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Re: Tillotson HD-5A

Postby No side stand » Fri May 29, 2020 12:21 am

Otis wrote:Can anyone identify a tillotson HD-5A? Looks like the HD-1 series but doesn’t have an accelerator pump. Possibly a racing carburetor?


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Re: Tillotson HD-5A

Postby Ferrous_Head » Fri May 29, 2020 1:29 am

I'm guessing the second and third pics are of the rare Tillotson HD5-DC12 ?
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Re: Tillotson HD-5A

Postby No side stand » Fri May 29, 2020 2:38 am

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Re: Tillotson HD-5A

Postby thefrenchowl » Fri May 29, 2020 4:11 am

But do not run that particular Tillotson 5A without the vent connected...

Otherwise the inlet valve doesn't know what AP is above the gas level in the tank...

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