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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 21st April 2006
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Default taking carb off bike?

is it necessary to take the carb off the bike just to change to 42 jet to a 45?

thanks in advance - rico
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Old 21st April 2006
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nope. you can do it on the bike. Lots of folks here have. I'm sure some of them will chime in.
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Old 21st April 2006
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Sportster Girl had a real good pic of how to do that.
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Default

It's alot easier just to take the carb off of the bike. Most people think its a big chore, but its really not that bad. With the carb off of the bike you get a better look at everything, and you can do a better job of cleaning. It's just a couple of vacuum hoses, some throttle cables, a fuel line, and a couple other small things. Its really not that bad, but I suggest that you go buy a HD service manual if you dont already have one!
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Default

Quote:
Originally Posted by ricodelfuego
is it necessary to take the carb off the bike just to change to 42 jet to a 45?

thanks in advance - rico

Hey rico, you can leave it on. You will need a 90degree #2 Phillips screwdriver to get the bowl screws off. I would replace them with socket head allens when you replace the bowl. The stock screws are junk.

Here's a pic with the bowl off:




You will also need to drill and pull the SILVER colored mixture screw cap. NOT the brass plug. You can drill a small hole with a drill (like a stubby bit in a dremel motor) then screw a small sheet metal screw in the plug and twist it out. This will give you access to adjustment your mixture.
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Default

All it takes is a tap on the float to give you more problems than you bargained for...

Take it off...clean it while you're at it.....

Getting to the mixture screw is the tough part...

I've had my carb off DOZENS of times, but I STILL don't work on it, on the bike...

For JUST a pilot jet change...I might....but not the first time I ever did anything to it....
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Old 22nd April 2006
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Quote:
Originally Posted by ricodelfuego
is it necessary to take the carb off the bike just to change to 42 jet to a 45?

thanks in advance - rico
no ... I don't remove the carb for jet changes... and prefert o remove the tank to do needle adjustment...

As the rubber ring that the carb sits at the inlet manifold tends to get a set in it and if it's over 6 months old will often require changing.....

To keep removing and replacing the carb without changing the rubber ring is a recipe for problems...



HOWEVER...... it's a good idea to remove it the first time to give you a better view of where everything is.... just replace the rubber if it's over 6 months old or feels hard or shows an indent from where the carb sits .. and use a bit of silicon grease on it when ya put the carb back in....
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IMO it is a bad idea for a carb newbie to work the carb in the bike. It is an easy job to remove it. There is the float system which can easily be disturbed. There are the jets etc that are made of brass == soft. There are bolts and jets which may be very difficult to remove. This all calls for working on the bench.

To repeat: IMO it is a bad idea for a carb newbie to work the carb in the bike. It is an easy job to remove it.
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