The carb itself is a Keihin 13mm. I believe the opening for the filter is 27mm +/- 1mm which shouldn't really affect your filter purchase. Do a search, I know that info is already on here somewhere...

 

The UNI filter number for the pod filter that fits a stock XR/CRF50 carb is UP4112ST

 

In case anyone checks this and cares, here are the honda part numbers for main jets for stock carbs on a crf50.

Honda dealers sometimes say they cant get them, if they say they cant, make a bet for a free jet, then give them a part number.

The honda part number for the #62 is “99101-1870620.” “99101-1870600” is for a #60.



Also, I've been looking at Sudco's catalog, and on page 72 under FCR Slow Air Main Jet the measurements are pretty dead on accroding to my caliper...I think that they should work as a main...Trying to get one to try before I can be totally sure though...



Here are the exact measurements (according to my caliper) of the I.D. and O.D. of the intake on the stock Keihin 13mm carb.



ID:24.46mm

OD:28mm



Hope this helps some people, and for the ones who search too!



After looking at BBR's site as well under Stock Keihin Jets, the FCR Slow Air Jet is defintely the ticket to a large array of jets for the stock carb...Exact match for the BBR stock jets...

 

Be aware that when you order any jets from SUDCO, there is a 4 jet minimum per size.

 

Be aware that when you order any jets from SUDCO, there is a 4 jet minimum per size.

Very true, this I know

 

Be aware that when you order any jets from SUDCO, there is a 4 jet minimum per size.

ah ha ha! Yea, (long pause) when I jet my carb if I could get it dialed in with playing with only 4 jets I would be pretty stoked!

 

ah ha ha! Yea, (long pause) when I jet my carb if I could get it dialed in with playing with only 4 jets I would be pretty stoked!

he's saying you can only order 4 jets minimum in EACH size. You'll be getting 4 of the exact same jet! Its also around $16. I talked to them today and he pointed me to jpmotorsports.com they are not cheap there either but you can get one per size.

 

he's saying you can only order 4 jets minimum in EACH size. You'll be getting 4 of the exact same jet! Its also around $16. I talked to them today and he pointed me to jpmotorsports.com they are not cheap there either but you can get one per size.

EXCACTLY! But you could also get those 4 and them just pawn them here for a few buck and either break even or make a few bucks....

 

jets R us.com, is a good place to gets jets. i have used them a bit. but when i did order one for the 50 id didn't fit. was kinda bummed. thanks for those honda part numbers. that's some good info