Custom Exhaust for your Z-50 - Look for more pictures in the Picture Gallery
Also contact them for Big Bore kits and larger Carb Kits

Contact:

Two Brothers Racing
1213-A East Hunter Ave.
Santa Ana, Ca 92705
714-550-6070
Ask for Jeff

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Some information from a helpful source at DENSO

Z50 4-Stroke

When I was still in my 'moped days' I drove a Honda C50 (Supercub)
It had a standard engine with standard 12mm carburettor and fixed ignition 
timing instead of the retarding ignition that is fitted to Dutch models to keep the
power down. Installed the platinum U22FS-ZU to replace the C7HSA and I could 
clearly notice the difference. There was no more hesitation in medium to high 
rev's and the engine could pull cleanly to about 9800 rpm.

Below I made an overview of the high performance plugs.

PLUGS for Z-50 and other Honda 50 to 90cc OHC 4-Stroke engines

NGK std.  Denso std.    Platinum (0.7)      Iridium (0.4)

C6HS      U20FS-U         U20FS-ZU

C6HSA     U20FS-U         U20FS-ZU          -

C7HS      U22FS-U         U22FS-ZU          IUF22

C7HSA     U22FS-U         U22FS-ZU          IUF22

C8HSA     U24FS-U         U24FS-ZU          IUF24

(C9H)     -               U27FS-ZU          IUF27A

(C10H)    -               U31FS-ZU          IUF31A

-         -               U34FS-ZU          -

CR7HS     U22FSR-U        -                 IUF22

CR7HSA    U22FSR-U        -                 IUF22

CR8HS     U24FSR-U        U24FSR-ZU         IUF24

CR8HSA    U24FSR-U        U24FSR-ZU         IUF24

The IUF..A types have a special very short ground electrode

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