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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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Tags
carb adjustment, cv40, jet, needle

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  #1  
Old 29th May 2016
night-train night-train is offline
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Default Changing Needle without removing carb?

I have a 97 sporty w/cv40 and tried to change the needle,but found the cap blocked by the throttle cable brackets upper tab.

I was tempted to cut it off, but figured to ask the collective.

How do you change the needle without removing the carb?

Getting really tired of pulling everything apart to screw with jets or needles. Made a great tool though
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Old 29th May 2016
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You have to loosen the throttle cable bracket to do it, but you can get the top off the carb without removing the carb. You can drop the float bowl and remove and replace jets without removing the carb too.

If you replace the screws with allen heads, they're a lot easier to remove and replace. Speed screws are handy for the float bowl. Yost make some nice ones. Or they did, when I had a carby; don't now if they still do.
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  #3  
Old 29th May 2016
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bite the bullet, taint that hard. inventive but be careful as the torque is not inline posing a stripped head situation. snake on a plane? they do make a changeable bit screw driver with a cable shank.
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Old 29th May 2016
night-train night-train is offline
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I'll quit being lazy and just pull it apart again tomorrow. Almost perfect..Almost.
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Old 29th May 2016
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Quote:
Originally Posted by night-train View Post
I'll quit being lazy and just pull it apart again tomorrow. Almost perfect..Almost.
Lol- good man
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Old 29th May 2016
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Might be easier to remove the tank.
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If you're contemplating removing the tank, you might as well remove the carb and be done with it.
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Old 29th May 2016
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Also, those screw heads are not Phillips, they are JIS (Japanese Industrial Standard) so be careful not to "cam out" those screw heads. A JIS #2 works perfect. I got one off Ebay for only a few dollars.

John
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Old 29th May 2016
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Default

Pulled the carb this morning, ended up rejetting it instead of playing with needles. Running a 48 / 190 and 1.5 out. Bike is pulling even better than before. The 2K~3,5k hunting is gone as well.

The lean showed on throttle , and on the dyno run, but the motor was not running hot.

Going to check the plugs later when it's cooler out. Probably going to schedule a dyno session in the next week or so.

Need to see where my fuel economy is with the new jetting...

Anyone know where to get those clear plastic washers that come with the head vent/carb support kit?? Was thinking of using annealed brass if the pastic ones aren't readily available.
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Old 29th May 2016
night-train night-train is offline
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Quote:
Originally Posted by John Harper View Post
Also, those screw heads are not Phillips, they are JIS (Japanese Industrial Standard) so be careful not to "cam out" those screw heads. A JIS #2 works perfect. I got one off Ebay for only a few dollars.

John
John, a good point! I found filing the tip off an non-JIS philips head allows it to sit in the JIS-screw properly, no camming.
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