OKO Kits on Montesa
Flange Mount for Amal Concentric Replacement: Montesa Cota 247
Mount rubber adapter with 8x25mm cap screws using a half inch heat block.
Insert 2" ID hose inside airbox hose and clamp to carburetor.
For the Montesa Cota 247s that used an AMAL concentric, flange mounted carburetor we remove the long heat block and the studs in the manifold and replace the heat block with a half inch thick one.  Then we add the flange adapter that comes with the Cota 247 kit and secure it with two 8 x 25mm allen head bolts.  Once the OKO is fitted we place the 2" inside diameter hose piece inside the end of the Cota's air box hose and clamp the hose to the carburetor intake.  The stock cable can be used.  Photos show a 28mm on this bike during testing, but we switched to a 26mm for better low end.
The Montesa Cota 348s used an AMAL MKII carburetor that is spigot mounted.  The stock sleeve adapter may be used for the OKO, but we provide a new sleeve in each Cota 348 kit.  Our test bike did not have a stock air box, so we used a UNI two stage filter attached to a rubber elbow to raise it and place it behind the side panels.  Since the AMAL MKII and the OKO both have a 49mm intake, the stock air box hose will fit directly onto the OKO's intake.  The stock cable can also be used.  This Cota 348 was fitted with an OKO 28mm K-101, but after much testing we are now fitting a 26mm K-101.  Sometimes the 28mm is slightly lean at the cutaway.  The 26mm eliminates this.
OKO K-101  Carburetor Kits
For  Montesa Cota  348 &349
and now for the Modern 315
Select your model Cota from the drop-down list below.  Kits include adapters for either flange or spigot mounts.  Carburetors are prejetted and include extra jets for fine tuning, if needed.  Check our Sales page for accessories if  a cable or air filter is needed.
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Spigot Mount for Amal MK II Replacement: Montesa Cota 348
Flange Mount for Amal Concentric Replacement: Montesa Cota 123
The Cota 123 used an AMAL 25mm flange mount carburetor, so the 123 kit includes the flange adapter.  The heat block is very thick and needs to be replaced with a 1/2" rubber heat block as the ones that came on Bultacos.  This are also included in the it.  The air box hose on our test bike fit nicely on the OKO intake, and we were able to use the stock throttle cable as well.  Our only complication was that the tab on the rear of the carburetor top hit a frame rail so it was filed off.  We used a 21mm K-101 which is a big improvement over the 25mm AMAL.
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Select the shipping destination and model you want the kit for.  Bikes fitted by us were a mid-sixties Montesa Scorpion and a 1976 Montesa Enduro 250.  Kits are jetted for these bikes and include manifold adapters.
OKO K-101  Carburetor Kits
For  Montesa Enduro 250 and Scorpion 250
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Select Destination Including Shipping
Spigot Mount for Amal MK II Replacement: Montesa Cota 349
The Montesa Cota 349s used an AMAL MKII carburetor that is spigot mounted.  The stock sleeve manifold adapter may be used for the OKO, but we provide a new sleeve in each Cota 349 kit.  Our test bike did have a stock air box, so we were able to connect the air box hose to the carburetor intake using a 2" ID rubber sleeve that fits over the air box spigot on one end and the OKO's intake on the other end.    The stock cable can also be used.  Order the 349 kit using the drop down box above.