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I am constantly developing new parts for this little Four. Keep checking for updates.

I know you want to build one of these killer motor's. Now you can !


My CB400F Yoshimura Racer

Here on this website you will find all the parts you would need to build one of these.  I will be adding some HOW DOES SHE GO Info with HP specs etc when I get her dialed in.
56mm Big Bore sleeve kit, Part # RSC-01

Manufactured from spun cast iron and ground to size.

Manufactured to order.

Set of 4 sleeves, not bored to final size.

Ready to install in your modified CB400F barrel/block

 Using the CB500Four or CB125 56mm pistons or if you are lucky enough to have the Yoshimura 56mm 2 ring slipper pistons. These have a small end of 15mm (stock is 13mm) It will be necessary to use performance con rods.
Copper and alloy head gaskets. Part No RSC-02

Laser cut.  1.0mm, 1.2mm, 1.5mm

Available bore sizes: 47.5mm, 51.0mm, 54.5mm, 56.5mm.

Part # Copper RSC-02, Part # Alloy RSC-02A
Titanium Valve spring Retainers, Part # RSC-03

Set of 8 retainers, a must for any high performance motor.

Manufactured from 6AL4V grade 5 Titanium.

Also available in 7075 T6 Alloy.  Part # RSC-04
Race Heavy duty Cam chain. Part # RSC-13

Full side plate as per the Yoshimura and RSC race chains.

Manufactured by DID Japan.
Stainless steel Valve set. Race part # RSC-06, Stock size RSC-07

Premium Racing valves for your stock and modified CB400F/CB350F motor.  Manufactured from a 1 piece forged 214 N (EV8) stainless steel.

* Flowed and swirl polished.

* Tips are refaced and hardened to 60 Rockwell.

* Available Sizes:

* Exhaust: 23.0mm, 22.0mm,

* Inlet, 26.0mm, 26.5mm, 27.0mm, 27.5mm. 

* Valves for all the Honda SOHC models can be manufactured on request.(sample may be required). 

 
Race Oil pump. Part # RSC-08

I can modify your std oil pump, just like Kaz did.

Increased oil flow.  A must for any CB400F with increased HP.

This is on an exchange basis only, send me your pump and I will do the rest.

Want to know how to do it? Click on the pic to take you to the PDF doc How to Up rate your oil pump.

Now available complete on an exchange basis from  400fourstore.com
Slotted Cam sprocket. Part # RSC-12

When fitting a new performance camshaft it is required to Degree in the cam to the specs supplied by the manufacture.  This is very important to get the max hp from your motor.

I can slot the std Honda cam sprocket to allow adjustment.

At the moment this is on a exchange basis until I can find a load of NOS sprockets.
Race Valve spring Kit. Part No RSC-14

For any race kitted 400 this is a must, don't even think about a performance head job without this kit.

To purchase this spring kit click on the photo.
Yoshimura 54.5mm piston kit. Part # RSC-04

A very nice kit with a 9.6-1 compression ratio.

Only a re-bore required.

Spare gaskets and rings available.

To Purchase this kit click on the Photo.
Bronze Valve guides Part No RSC-05

Available to fit the CB350F and the CB400F.

* Manufactured from a special manganese bronze.

* For the CB400F allows the fitting of valve stem seals to the exhaust valve.

* Set of 8 guides

Heavy duty Race or Road lower cam chain adjuster horseshoe. RSC-09

The OE part is no longer available from Honda.

* Much improved design over the stock part.

* Horseshoe manufactured in 7075T6 aluminium. Pivot bracket in EN8 steel.

* Bronze bushed pivot point with stainless steel pin.

* Keep that chain adjusted and this will not sieze up.

 
New items not shown

Available to special order.

Race heavy duty I beam conrods. 13 or 15mm small end. RSC type.

Close ratio 6 speed race Gear-box. Click on the photo for the specs/ratio.

Fully ported cyl head with all the goodies.

Knife edged, lightened and semi polished balanced crankshaft.