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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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27421-99a, carb, fuel system

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  #1  
Old 5th August 2009
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Default '79 1000cc carb part # 27421-99A

Hello All!

Harley Davidson carburetor part #27421-99A

Has anyone had experience with rebuilding one of these carburetors?

This is on a '79 1000cc XLH Sportster with 22,000 miles.

While I am on the subject:
Has anyone considered or actually done an upgrade of the fuel system, like going to some sort of fuel injection or better quality carb?

Are there any mods which can be done to this carb?
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Old 5th August 2009
GA_Ironhead GA_Ironhead is offline
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No mods really necessary. The CV carb can support a 100hp motor in stock form. Some of the Evo riders may have more experience with rebuilding than the IH guys. Can't swing a dead cat for hitting a CV in the Evo group... they're far less common over here.

Jets and possibly a different needle to cure transition flat spots are all that you'll probably ever need. Then there's the Dynojet kits - opinions vary on whether to do that "upgrade".
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Old 6th August 2009
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Thank you GA Ironhead for the info.
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Old 6th August 2009
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Quote:
Originally Posted by GA_Ironhead View Post
No mods really necessary. The CV carb can support a 100hp motor in stock form. Some of the Evo riders may have more experience with rebuilding than the IH guys. Can't swing a dead cat for hitting a CV in the Evo group... they're far less common over here.

Jets and possibly a different needle to cure transition flat spots are all that you'll probably ever need. Then there's the Dynojet kits - opinions vary on whether to do that "upgrade".
+1

Ixnay the DynoJet kit no thunder slide or thunder jet needed either.

Start with a 46 - 48 pilot and a 170 main put 2 very small washers under the needle if you need it.

If the carb has been modded, get another.... they are cheap, you can buy them by the box full at the swap meets.
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Old 7th August 2009
GA_Ironhead GA_Ironhead is offline
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Stone stock is the preferred mixer. The idle mixture screw is easily hosed, if one isn't careful. If you're shopping, look for a carb with the IMS cap still in place.
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