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2017 CRF 50 Air Screw?

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Just purchased a 2017 CRF 50.  Seems to have a slight lean hesitation when adding power.  I don't see a air screw.  All I can find is the idle screw and a brass plug in the place of where an air screw would normally be.  Any Ideas on how I can adjust this carb?  I slid a torx driver in the brass plug and it does rotate.  Hopefully I didn't screw it up too bad.

Any info is much appreciated.

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Unless they've changed it in the last couple of years, the brass cap you are referring to is actually the air/fuel adjusting screw. It has a "D" shaped head that requires a special tool to adjust. A lot of guys simply cut a slot in the screw to use a screwdriver. Post a picture of the "cap" and we should be able to confirm that's what you have.

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Apparently on the new bikes the d shaped screw is covered by a brass plug.  The dealer told be to drill a small hole in the plug to remove it, which i did.  Do they sell an aftermarket air screw with a standard slotted head?

Thanks again for your help.

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You can order a replacement air screw and spring ( part #16016-GEL-701) for an '03 XR50 and it should work for you.

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On 5/11/2017 at 6:33 PM, 300Braaap said:

Thanks for the part number.

Nothing like bumping a 3 year old thread.

 

that said, i just pulled my sons 2000 xr 50 carb for a through cleaning after his first ride on it.  We just purchased it for him.  He is the last of my small riders (age 5).  The other 4 are all on larger 2 strokes.

anyway......

The A/F screw on this bike doesn't have a spring.  Manual says it should.  I have ordered a replacement; but like everything else now a days its like 2 weeks out.  Any idea how the bike will perform upon reassembly without the A/F spring, until it arrives?

 

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It'll probably vibrate out and you'll lose it, hence the use of the spring, which is there for two reasons - to hold the setting you want, and to hold it in place so you don't lose it.

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1 hour ago, dirtbkr188 said:

It'll probably vibrate out and you'll lose it, hence the use of the spring, which is there for two reasons - to hold the setting you want, and to hold it in place so you don't lose it.

ya, i get that.  I guess it would relatively no effect on performance (unless, like you point out, it moves during use).  the odd thing is.  it was rid'n for about 6 hours prior to me pulling the carb.  unscrewed the a/f screw - no spring.  Seems to have held without it.

 

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