OKO K-101 19mm-30mm Parts Breakdown
1-      Carburetor Body              $20.00         
2A    Complete Choke               $6.00
2B    Cable Pull Choke             $10.00     
3-      Float                                   $15.00                        
4A-   Float Bowl, Metal              $10.00      
4B-   Float Bowl, Clear              $20.00       
5-      Float Bowl Gasket           $5.00       
6/7    Drain Plug w/O Ring        $7.00                 
8-      Float Needle w/Clip         $5.00     
9-      Jet Block w/Gasket          $20.00                      
10-    Pilot Jet                              $6.00                        
11-    Needle w/Clip                    $8.00              
12-    Needle Clip                        $0.50                  
13-    Throttle Valve/Slide         $15.00    
14-    Jet Block Gasket              $1.00         
15A- Top (Straight )w/gasket     $5.00            
15B- Top (Curved)w/Gasket       $10.00          
16-    Top Gasket                        $1.00                  
17-     Air Screw w/Spring        $4.00                  
18-    Spring                                 $1.00                          
19-    Slide Spring                      $5.00              
20-    Float Needle Clip             $1.00       
21-    Float Bowl Screws (2)    $1.00 
22-    Vent Hose, Long              $2.00           
23-    Vent Hose, Short             $1.00         
24-    Float Pin                             $2.00                        
25-    Vent Hose Clip                 $0.50           
26-    Main Jet                              $5.00
27-    Cable Adjuster w/Nut      $5.00         
28-     Nut                                      $1.00           
29-     Idle Screw  Complete     $4.00 
30-     Spring w/Washer            $2.00        
31-     Needle Holder                 $3.00                     
32-     Top Screws (2)                $1.00                          
33-     Washer                              $0.50                 
34-     Needle Jet                        $4.00                           
35-     Main Jet Holder               $12.00              

In the text box below, list the numbers or names of the parts you want and the quantity.
In the text box below, choose the size carburetor parts are for.
Place your  e-mail address and country parts are to be shipped to in the box below and I will send you a price quote.
Use the text box below for questions or details of your order.
OKO K-101 Clear or Metal Foat Bowl 
OKO offers this clear float bowl for the K-101 series so you can easily check the float level, or see if any dirt or water has accumulated in the bowl.  It attaches with four screws (incuded).  It does not have the bottom nut for access to the main jet.  This may be purchased by itself or with a K-101 Carburetor kit.  Click on the "options" when ordering.
Clear Float Bowl Options
Carburetor Size
We have three kits for adapting flange mount manifolds for spigot mount carburetors and one sleeve for spigot to spigot mount.  #1 has 2" or 51mm bolt center spacing and is for 34-35mm carburetor spigots.  #2 has 60mm bolt center spacing and is also for 34-35mm carburetor spigots.  #3 has 60mm bolt center spacing and is for 40-42mm spigots.  #4 sleeve is for 33 to 35mm spigots and #5 sleeve is 39mm ID on one end and 33mm on the other.  We also have a couple of larger sleeves.  contact us for availability. 
Manifold Adapter Kits
Rubber Manifold Adapters
Adapter Size:
K-101 Gaskets and Sets
This universal throttle cable kit from Venhill comes with everything needed to create your own custom throttle cable.   Outer housing and wire are over 4' long with an array of fittings.  Slide end is already attached and a solderless throttle end is included

Throttle Cable Kit Options
K-101 Needles 
We carry several Needles for the K-101 series.  The stock needles for the various sizes from 30mm to 21 are available.  Note:  To date, we have used the 28mm, JJH needle for all applications from 19 to 28mm.  We suggest you try the JJH if you find the stock needle has too much taper, giving a rich mixture towards 3/4 throttle.
Main Jets
Select or tell us the size you need.  You can adjust the quantity at Check out.
Slow Jets
Select or tell us the size you need.  You can adjust the quantity at Check out.
Needle With Shim
Needle Type
Slow Jet Options
Enter Size Wanted
Main Jets
Enter Size Wanted
Curved Top, Straight Top, or Gasket
This curved top for the K-101 is  sometimes the answer to limited space above the carburetor.  It uses slightly more free cable than the straight top.
Curved Top Options
Domino Throttles
There are three replacable rubber gaskets in the K-101 Carburetors.  One is for the float bowl, another is for the float bowl drain plug, and the third is for the jet block.  These are a good set of spares to have on hand.
Note: OKO has thickened the jet block gasket, eliminating early leakage problems of air and/or fuel from the float bowl.  A good seal here is imperative to get your OKO properly dialed in.
This is the Domino slow throttle used in  trials.  Kit includes a "set screw" throttle end to eliminate soldering. Choose either the "slow" or "fast" throttle, with or without grips.
Throttle Options
Slow or Fast Throttle
K-101 Gaskets
Select Carburetor Size
Parts and Accessories
K-101 Needle Shims
Venhill Universal Throttle Cable
Electrex World Electronic Ignition Kits
We now offer Electrex World electronic ignition kits for several Trials motorcycles as well as other bikes.  These are made in the UK and are of very good quality.    We can supply them for BSA, Bultaco, Fantic, Triumph and Yamaha Trials bikes as well as others.  Prices for Bultaco and Yamaha kits start at around $250.00 without the lighting coil and $300 with the lighting coil.  When a new flywheel is supplied, as with the Montesa cota 348 system, cost is typically about $50 more.   Call for availability and prices of other kits.
Call Roger at 410-635-6722 or 443-821-6154.  
12mm  Petcocks
These have 12mm by 1.5mm threads and are used on many Spanish bikes as well as other European bikes.  We carry two versions, horizontal outlet and vertical outlet.  choose which you would like from the drop-down box
Needle Shims
Often, the best needle clip position is between notches, so we offer this five pack of shims.  One shim sets the needle height half way between notches
K-101 Slides/Throttle Valves
We carry replacement slides for the K-101 Series from 21mm to 30mm.  Select the slide from the Drop-down list.  
Note:  OKO does not use different cutaways as others do.  The bottom of the slide is made to match the profile of the jet block.
K-101 Slides
K-101 Carburetor Size
K-101 Jet Blocks
K-101 Main Jet Holders
Jet Block With Gasket
K-101 Carburetor Size
Main Jet Holder
Carburetor Size
Note:  Parts not listed here can be found at the bottom of this page.  We hope to add them here soon, but in the mean time you can order them using the text box in that area and we will send you a Paypal invoice which will include shipping.  As noted above, shipping will be free if parts and/or accessories are ordered with a carburetor or if the order totals $20.00 or more.  Orders under $20.00 will have a shipping fee of $5.00
Petcock Choices
We carry jet blocks for all sizes.  Not normally a wear item but can get plugged or damaged.  It comes with a jet block gasket as above on the right. 
Main jet holders available in all sizes, from 19mm to 30mm  
We have not had any issues with floats, but have had requests for these.  They come with the float needle with the Viton tip.  Float leakage problems are mostly caused by wear or damage to the float needle tip.
K-101 Float and/or Needle
Float and/or Needle
OKO K-101 and K-104 Cable  Operated Choke
For bikes that have poor access to the regular pull choke, OKO has this conversion kit to change over to a cable operated choke.  Comes with a curved top, and we also can provide a straight top if desired.  We will soon be providing a kit that will include a Venhill universal cable and an alloy Domino choke lever.  For now, if needed we have the cable listed lower on this page.
Cable Operated Choke
K-101 Air Screw
K-101 Idle Adjustment Screw
Fits all K-101s from 19 to 30mm.  Comes complete with spring.
Idle screws are different for different size carburetors.  Let us know what size you need it for, Comes complete with spring.
Air Screw With Spring
Idle Screw With Spring
Size of Carburetor
We carry and sell virtually every part for the K100 series of OKO carburetors.    Parts for the larger K-104 series are not yet listed, but all are available.  K-104s do use the same air screw and pull choke.  Also, Keihin's 28mm PWK can use most of OKO's parts, excluding the slide, the idle screw and the needle jet.  Contact us using the form at the bottom of the page for prices and availability.  Shipping is included for orders with carburetors, or those totaling over $20.00.  On orders under $20.00 you must add the $5.00 shipping cost.   
Venhill Universal Clutch/Brake Cable
This universal cable kit from Venhill comes with everything needed to create your own custom front brake or clutch cable.   Outer housing and wire are over 4' long with an array of fittings.  Lever end fits three hole sizes and comes with an eight mm set screw barrel for the other end.
Clutch Cable Kit Options
Shipping Costs
USA buyers:  Select the shipping cost of your order below.
Heat Block
Used on Many Spanish and British bikes that had AMAL MKI Concentric carburetors.  They are 1/2" thick and the bolt holes are 2" on centers, made for 5/16" or 8mm bolts.
Please Note:   
All parts orders shipped within the USA totalling less than $20.00 will require $5.00 for shipping. 
Expedited shipping for parts orders (Priority Mail) is $10.00 
Carburetor orders ship for free, but you must choose the correct destination.
Contact us for shipping costs of parts outside the USA. 
OKO K-101 and K-104  Pull Choke
This stock pull choke fits all K-101 and K-104 OKO carburetors, from 19mm to 40mm
Pull Choke Options
Needle Jets
We have needle jets for all 
K-101 carburetors, from 19mm to 30mm.  Select the size from the drop-down box.
Needle Jet Prices
Select Carburetor Size
Your email address here, so we can reply.
Venhill Universal  Long Throttle Cable
This universal throttle cable kit from Venhill is 92 inches long and comes with everything needed to create your own custom throttle cable.   Slide end is already attached and a solderless throttle end is included.  It is currently a special order item taking about five days for us to obtain.

Long Throttle Cable Kit Options
We have slow or pilot jet sizes in stock from 30 to 70+.  Examples of popular sizes are:
We have main jets in stock from 90 to 180.
Examples of popular sizes are:
Trials Shocks
We carry two types of Betor Gas Trials shocks, Expert and Pro.  Expert shown to the left, the Pro shocks are aluminum bodied with threaded spring adjustment, rather than circlips, as on the Expert shocks.  These both come in lengths from 330mm to 400mm with spring rates of either 40 or 50 pounds.  Cost of the Expert shocks is $185.00 including shipping and cost of the Pro shocks is $260 including shipping.  These are special order due to the number of sizes.  Shipment usually takes about a week.
Select Pro or Expert Shocks
Select Spring Rate
Length Between Mount Centers
Curved top with adjuster is no longer available.
It now comes without the adjuster.
Yamaha and Bultaco Kits
Add Lighting Coil
Visu Filter and Kits
Select the Visu Filter and/or 
1/4" Tygon Fuel Hose per foot
Renthal Trials Bars
We carry Renthal Trials  Bars in various "rises" up to 6".  We don't always have these in stock, but it just takes about a week to get here from the UK.  These cost $20 to ship so we offer a shipped price and a picked up price.
Options to ship or be picked up
Lever Options
Alloy Levers
We have Doherty Alloy Levers and Shorty Alloy Levers, both for 7/8th inch bars.  The Doherty are full length with larger cable end holes typically found on Spanish and British Trials bikes.  The Shorty Levers have a smaller cable end hole that is typical for Japanese bikes like Yamaha.
Domino Choke or Decompressor Lever
This small lever is a perfect match for the Cable Choke kit or can be used with a decompressor.  It is offered by itself or as a kit with the Cable  Choke and a Venhill Cable for those hard to get to chokes.
Throttle Options
Air Filters
We are offering several air filters, three for the K-101 series (19mm-30mm), and one for the K-104 series (32mm-40mm).  We have the UNI 2-stage foam filter for the K-104s and we have a European foam filter, a K&N style filter and a Nibbi style filter for the K-101 series.   Select the air filter you want from the drop-down list.
Choose Filter

Short European Filter

K&N Style
Select Filter and/or Fuel Hose

Nibbi Style