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KTM Block off/ Delete Kit & Breather Hose Relocation for 2008-2011 KTM 400/450/530 XC-W, EXC for Racing


Manufacturer: Blais Racing

Product Information

KTM Smog/ Emissions Block off/ Delete Kit & Beather Hose Relocation for 2008-2011 KTM 400/450/530 XC-W, and EXC for Racing. 


For 2012-2016 KTM 500 Block off Kit Click Here


This is a quick and easy way to keep you KTM 400/450/530 XCW/EXC running better and remove all of those emissions canisters along with rerouting the Breather Hose for Racing Conversion.  This is the same stuff we use on the Factory KTM race bikes.  Kit includes OEM quality hose, 7075 Aluminum Carb plug, sealing washer, & Cylinder head plug.


Remove small hose and fitting from Cylinder Head.  Replace with small bolt and loctite in.


Remove Crankcase breather hose from Carburetor.  Remove Brass fitting from Carburetor and Replace with Plug.  Make sure to loctite.


Remove the old breather hose completely and replace with new one.  Run the hose out the bottom of the frame with the carburetor vent lines.  It may be necessary to cut the hose shorter so that it isn’t handing down too far below the frame.  Remove the emissions canister if equipped.


More detailed instructions and photos are included.


This modification is 100% for Closed Course Competition Use only. Not Intended for Street Use!  Does not conform to CARB/ EPA laws and regulations and is not legal for use upon a highway.I understand that it is illegal to install an aftermarket part that is intended for use with, or as part of, a required motor vehicle pollution control device or system that alters or modifies the original design or performance of the motor vehicle pollution control device or system unless the part has an Executive Order from CARB. Installation of these types of parts which are not CARB‐approved on a pollution controlled motor vehicle in the state of California may result in the Department of Motor Vehicles (DMV) revoking the vehicle registration and certification of ownership (title), refusing the transfer of registration, and/or the vehicle failing smog inspection. It is illegal to operate a vehicle in California with an illegal aftermarket part. Law enforcement may cite you for the use of an illegal aftermarket part and seize your title and license plate. By ordering this product you agree to these terms.  You agree that Blais Racing Services only sells racing parts and parts for converting your bike into a closed course competition only vehicle and will not use Upon a Highway!


This kit keeps oil deposits out of your Carburetor and keeps your bike running better longer.


Check out our KTM Thermostat EliminatorSpacer,  Dirt Tricks Tensioner , Blais Racing Aluminum Oil Pump Gears,  KTM Jetting Kit,  Hour Meter, 1 lb Lithium Bike Batteries.


Motion Pro ForkTru- Fork Alignment Tool


Samco Sport Radiator Hose Kit (Eliminates Thermostat)


KTM Billet Radiator Guards


Eline Carbon Fiber Skid Plate


FMF Exhaust


BRP Chain Guide


If you order the Block off kit by itself it will be shipped by USPS.




Blais Racing Services also offers Jetting and Needles for your specific needs.  Please just send us an e-mail with bike year, model, exhaust, and normal altitude you ride at and we can get what you need.


Product Code: KTMBlockOffKit


California Cancer and Reproductive Harm WarningWarning: Cancer and Reproductive Harm -

These warnings are not an indication that these products are violating any safety standards or regulations.

However, as our products might be sold in the state of California, we are legally obliged to inform customers about the potential presence of these chemicals in our products.

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