Kawa Z440 goes racing

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    Hi Lonesome Twins,

    as the GPZ305 ended her race career after just one track event
    I had to look after a replacement in the class below 55HP 😉
    It will not replace my “Vienna”, the Z750Twin race bike.

    I’ve found a massive modified Z440 and some of the mods are more for the look of it and doesn’t improve the usability of the bike. Some are quite interesting mods that upgrade the chassis.

    Well, here some pics:

    This is how it is in the moment and some more mods will be done by me like exhaust system, recessed footrest and will try wheels of a GPZ550 Unitrak. Looking after some engine, carb and ignition upgrade as well.

    Rear swing arm is modified fron ZR750 “Zephyr” incl. their rear shocks, front fork and brake is GPZ600R, wheels are from a Z1000, the green fuel tank and the downtubes are Z750LTD Twin 😉

    Will keep you updated and bike is intended to run from April 2020 on the racetracks !

    Cheers, Michael


    Good luck Michael!


    Well, little progress made. This bike gets upswept exhausts as well as the “Vienna” has it.

    Looking for a rare fuel cap of this tank:
    <p style=”font-weight: 400;”>Kawasaki KZ400-B1 KZ400-C1 KZ400-B2</p>
    <p style=”font-weight: 400;”>KZ440-B1 KZ440-B2 KZ650 KZ650-D1</p>
    <p style=”font-weight: 400;”>KZ650-D1A KZ650-D2 KZ650-E1</p>
    <p style=”font-weight: 400;”>Fuel Gas Tank Cap Assy  51048-1001</p>


    Hi guys,

    I will get a new fuel cap welded into this tank, so don’t need the mentioned cap anymore.

    Got a pair of chinese KOSO PWK 34mm flat slide carbs and larger intake boots to mount them. Fits quite well and I will see if this small engine will take “food” from these large carbs 😉

    Still a lot to do 😉

    BTW: These two carbs weight is 900 gramm total while the stock carbs have 2.2 kg !


    Hi Lonesome Twins,

    the stainless steel exhaust headers arrived and it is hard to cut half of them away. That is needed to find the right angle to the collector. Only three parts of the exhaust are missing now and a special exhaust part that separates the collected exhaust gases to the two mufflers is ordered in UK !

    Looks good to weld the exhaust parts, as far as needed, in the next few weeks and a hoop out of an Aprilia 125 rear frame to this Kawa frame to hang the mufflers on.

    Fuel tank will get a new, modern cap of a Suzuki Gladius. Can’t find this OEM Kawa fuel cap. After it’s return we will weld the rear tank holder to the frame to fix it in it’s final position. After that I will look after the rear fairing and the seat.

    A lot of other things to do as well 😉

    Cheers, Michael

    This part to weld into the Kawasaki tank

    Nearly solved the conversion from 20mm to 17mm rear axle diameter to match the GPZ550UT rear wheel bearings.

    New, matching 270mm brake discs. Anti-Dive-System will be removed completely when maintaining the front fork.

    The tire size will be 90/90-18 front and 110/80-18 rear, same as with the GPZ305, but on wider rims. That should suit better.

    This is the same rear tire on the narrow rim of the GPZ305 and I was real inclined 😉

    It is very interesting to tune motorbikes, in theses cases all Kawasaki Twins, for racing purpose. Looking forward to be fast with the Z440 in a class up to 55HP and with the tuned 906ccm engine in the “Vienna” in 2020.
    Race season starts in April 😉


    My son Nils welded two major parts of the exhaust system 😉

    Still a lot of work to do, but it is fun !

    Cheers, Michael

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