To the right, select the shipping destination and the size carburetor needed.
Select Destination, Including Shipping
Size/Color
Tell us jetting if known
Note:  Carburetors are jetted according to the  settings used in our actual trials.   It must be noted that older bikes are not like new bikes coming off of the assembly line with perfect timing and compression and with unrestricted exhaust systems.  Carburetor tuning is based on all of these factors, which vary greatly on older bikes, even of the exact same model.  Settings will vary some from our test bikes according to the condition of your engine and exhaust system, even your air filter.  To get the most out of your OKO carburetor, make sure your timing is correct, your compression is good, and your exhaust system and air filter are unclogged.  Also, it cannot be stressed enough to use a good quality fuel filter.  Most fuel leaking is due to a small piece of dirt or grit lodged in the float needle seat.  If the dirt makes it past the float needle it will often find a home in your pilot or main jet.  On two-stroke engines, use a good quality two-stroke oil at a 50:1 or higher ratio.  We will include extra jets with your kit for differences in elevation and the other above factors.  Use these to fine tune the OKO to your engine.  If you have any questions or problems you can e-mail us at usaoko@comcast.net and we will pespond, generally within twelve hours or less.  If you prefer to talk to a real person, call me, Roger, at 410-635-6722.  If there is no answer, leave a message or try my cell phone at 443-821-6154
For those close by we offer free installation and dialing in of your OKO on practically any bike you wish to instal it on.  Just give me a call.
USA-OKO   Carburetors and Accessories
USA-OKO is an authorized distributor for the OKO factory in Taiwan. All carburetors and parts come to us directly from the OKO factory.  Below you will find OKO 'D' Slide carburetors from 19mm to 40mm suited for motorcycle engines between about 50cc to 500cc plus. We also carry a full supply of parts, needles and jets and can order any parts you may need.  All orders ship from our location in New Windsor, MD, USA within 24 hours of receipt of payment.  All purchases are made through Paypal.  If you do not have a Paypal account, at check out you have the option to use a credit card instead.

Click for Information and Photos
Click For Information and Photos
Click for Information  for TY 175 and TY 250
All purchases are made through PayPal.

If you don't have a Paypal  account you can choose the option to use a credit card at check out.
So, what happens once I place my order?
Once we have your order, we take the correct size carburetor off the shelf.  We disassemble it, check and set the float height and replace jets and the needle as needed for the application.  Then we make sure all internal passages are clear and make sure the float needle seals as it should.  We prepare a manifold and/or airbox hose adapter if required.  We then gather extra jets as needed for differences in elevation, airboxes and exhausts.  We also include a shim for the needle as many engines require the needle to be set mid-way between the needle notches.  Your order is then boxed and labeled for shipment, either that day, or the following if the order is placed late in the day.  A tuning guide and information sheet for each application is included.  All domestic kits ship via USPS Priority Mail.  Shipping cost is included in the price of the kit.  International orders are shipped via USPS First Class Mail and usually take a week to fourteen days at the most to arrive at the most distant countries.
Basic OKO K-104  Carburetor

Select Destination, Including Shipping
Size
We carry many OKO kits for specific motorcycles.  Most of these are for Vintage and Classic Trials, Enduro and Trail bikes, but we also have kits for some road bikes, ATVs and Pit bikes.  We are always willing to work with customers to develop kits for their bikes if not already available.  Kits have carburetors of the correct size and are jetted for that specific bike.  We include a manifold sleeve or adapter, as well as a sleeve to adapt your airbox hose to the OKO if needed.  Extra jets are provided for different elevations, and we will jet your bike accordingly if you tell us your elevation.  If a throttle cable is needed we offer Venhill Universal cables at a reduced price along with the kit.  Other options are also available at reduced prices when ordering a kit.  Click on the buttons below to take you to kits we have for different makes of motorcylcles. 
Return Policy Note:  We offer a 30 day warranty on all carburetors.  If the carburetor cannot be dialed in due to a defect in the carburetor, simply return it within 30days of the purchase date and we will repair or replace it, at our discretion and ship it back to you at no cost .  You only need to pay to ship it to us.  Also, if we have not included the correct jets or needle (kits only), we will work with you on an exchange basis.  Send us the jets or needle that are not correct and we will send you replacements as per your request, again at no cost to you.  We will work with you as much as possible to get your OKO properly dialed in.  You can call Roger at 410-635-6722, or 443-821-6154 with any tuning questions.

Select Destination, Including Shipping
Size/Color
Make, Model, Engine size
Jetting Desired if Known
K-104s are available in sizes from 32mm to 40mm.  We keep a limited stock of these sizes, so please contact us for availability.  Select the shipping destinations and size wanted
Deluxe OKO K-104  Carburetor

Deluxe K-104s are available in sizes from 32mm to 40mm.  Contact us for current availability.  Select the size wanted from the drop down list,  along with the shipping destination, either the USA, Canada, or Worldwide
Select Destination, Including Shipping
Size
Make, Model, Engine size
Jetting Desired if Known
Click for Information and Photos
For those of you who want the best flow possible through your carburetor's bore we now offer all of our K-101 Series Carburetors with a hand polished bore which includes the top of the jet block.  Imperfections in the casting are smoothed to a mirror-like finish assuring the best possible flow.  If you've ported and polished else where you may want to also have your carburetor bore polished as well.  After selecting the carburetor or kit you want, select the Hand Polish option from the button to the right.
K-101
Hand Polished Bore
Please Note:  Many Chinese companies are now copying the OKOs and marketing them as genuine.  Externally, they appear the same, but often the internal drillings are not correct, making them impossible to tune.  They are available on Ebay and through companies marketing Chinese products, like Alibaba.  Their prices are good, but function is not.  Be aware that genuine parts which could fix the copies, often do not fit.  The best way to tell a genuine OKO from a copy is that all genuine OKOs come with the Taiwan flag in the upper corner of the box.  Copies will have a white rectangle in it's place denoting the size of the carburetor.  You can click the button to the left to find out more about genuine OKOs and the copies.
If you just need the basic OKO K-101 D-Slide carburetor without any extras use the form to the right.  They come with standard needle and jetting, or we will jet it as you dictate.
Carburetor Options
We offer  a Deluxe kit  K-101 which gives you extra jets, richer and leaner. They can be exchanged if needed at no extra cost.  We work with you until you get the OKO dialed in.
To the right, select the shipping destination and the size carburetor needed.
Carburetor Options
Please Note:  We now offer the 21mm, 26mm, 28mm and 30mm in Black.  If this option is not available in a kit, just let us know and we'll send the black carburetor
Please Note:  All genuine OKOs come in this box with the Taiwan flag on the box.  No flag means it is a Chinese copy.  If it is shipped from China or Hong Kong it is also a copy.
Motorcycle Specific Kits
The Ultimate Performer
21mm-26mm Carburetors
For those of you who want the best performance from the 21mm through 26mm carburetors, we now offer the "Ultimate Performer" modification to increase top end perfomance without loss of any low and mid-range power.  OKOs are already known for their superior performance, and this mod takes them to the next level, providing extra top end power and revving ability.  After selecting the carburetor or kit you want, select the "Ultimate Performer" modification.
Note:  Special thanks to reknowned stuntman and trials rider, Lane Leavitt for help with testing these carburetors.
Ultimate Perform & Polish Options
Add Hand Polishing and/or the Ultimate Performer
to my already selected Carburetor or Kit
Carburetor Options
Hand Polishing and Ultimate Performer