denoonsp - Home of the modified 400F

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Services - All Prices Listed are in US Dollars

Carb Boring - CB400F


     A modified CB400F can handle a set of 29mm CR Keihin Racing Carbs, but price and lack of idle circuits are a major problem for a street bike. Let us bore your stock carbs to 24 mm. The stock venture is actually oval shaped measuring 16.5  mm wide x 21.5 mm high. The theory being that the narrow width keeps the gas velocity high at small throttle openings, and the extra height exposes more area at wide open throttle, acting like a larger carb. We widen and heighten the venturi on a CNC mill, and then smooth the exit transition during a second operation on a CNC lathe.

Carb Boring CB500/CB550

We can now handle CB500/550 slide body style carbs now also. Jigs have been constructed to securely hold and postion the carb bodies for accurate boring and CNC milling.


Wheel Adapter Kits 


 Time for some new shoes, we can provide all the design and machining services to install modern 17" wheels, forks, and disk brakes onto the classic CB400F

Custom Triple Clamps 

     Need some custom clamps to mate some larger forks to your CB400F, look here..

Braced Swing-arm 

Add a touch of superbike flair to your CB400-F. We can brace your stock arm with 1018 ERW tubing for a fraction of the cost of an aftermarket arm. (If you can find one)




All denoonsp parts are sold “as is” without any warranty of any kind. All implied warranties, including all warranties of merchantability of fitness for a particular purpose are excluded.

Purchaser acknowledges that vehicles equipped with these parts must not be operated on public highways since such operation may be unlawful. These performance parts are intended solely for use on vehicles participating in off highway competitive events.
Purchaser understands and recognizes that off road and racing equipment and services provided by manufactured and/or sold by Distributor are subject to varied conditions due to the manner in which they are to be installed and used.  Purchaser further recognizes and agrees that suitability of any part sold or manufactured for a particular application is the purchaser’s decision and that the purchaser is not relying on the skill or judgment of manufactured and/or Distributor regarding suitability of any product or service.
Manufacturer and Distributor make no warranties whatsoever, expressed or implied, oral or written to purchasers with regard to off road and racing equipment.  The right to make changes in design or add to or improve on product without incurring any obligations to install the same on products previously manufactured is expressly reserved.
Buyer agrees to indemnity and hold seller harmless from any claim, action or demand arising out of or incident to the buyer’s installation or use of products purchased from Manufacturer and/or Distributor. 

WARNING: Installation of any component or kit should only be performed by persons experienced in the installation and proper operating of vehicle systems.  


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