Michael

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Viewing 15 posts - 1 through 15 (of 1,040 total)
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  • #25582
    Michael
    Participant

    Hi TJ,

    bad news !

    Glemseck 101 will not take place in 2020 !

    Good luck, take care and stay healthy,
    Michael

    #25439
    Michael
    Participant

    Hi Vic,

    it seems so!
    I am deleting the spam folder on a regular basis without checking every mail.

    Would you please be so kind to resend it to me and I will watch out for it 😉

    Cheers, Michael

    #25384
    Michael
    Participant

    To upgrade our transport and camping capabilities I’ve bought a Ford Transit.

    Diesel, 100 HP, air conditioning, auxilliary heating, an Airline rail system in the floor and an integrated wheelchair ramp !

    After some modification we can transport three racebikes easily now.
    Big advantage is that we don’t have a general speed limit anymore as it is existing for trailers in Germany. With trailer only 80km/h are allowed, special trailers (with brakes and approval) may  run 100 km/h and some parts of the motorway have a ban on passing when pulling a trailer.

    Cheers, Michael

     

    #25379
    Michael
    Participant

    Hi Vic,

    final compression after the piston was “manipulated” a bit (pockets for valves, pinch-off edge(?)) and cylinder foot gasket (1mm) and cylinder head gasket (1mm) are used is 9,57:1.

    This engine runs with stock LTD ignition (pointless) and single spark plug per cylinder.

    Cheers, Michael

    #25378
    Michael
    Participant

    Hi Vic,

    I’ve tried this before and wasn’t successful as these things are more expensive in Germany.

    I’m interested in two sets of these !

    Questions: The stock sleeves have to be removed, the cylinder block maschined to larger diameter. The new sleeves have to be maschined at the outside to fit into the cylinder block and at the inside to match the new pistons.
    Is that included in the mentioned price ?
    Where to get the cylinder blocks from ?
    Tax and shipping to Germany is another thing.

    I have some of them, can remove the stock sleeves to save time and weight, and ship them to you prior to the mods.

    You may send me an e-mail to michael.6666@gmx.de

    Cheers, Michael

    #25374
    Michael
    Participant

    Hi Doctorot,

    thank you for your interest in the engine tuning.

    Well, let me sort some of your questions:

    The major frame mod at the “Vienna” is to cut the rear frame off and also the rear cross-tube out of the frame. The cross-tube was in the place where the silencer is now. To gain stability of the frame again, I’ve welded angled cross-tube out of an 125ccm Aprilia rear frame (very cheap part over here at ebay) into the Kawa frame, one is above and one is below the silencer:

    The ideal inner tube diameter is 40mm while the length of the downpipe is 66cm (incl. exhaust port depth down to the valve). The collector should have a length of approx 15cm, not just a conjunction of two downtubes.

    The silencer is an absorption style damper with 60mm inner diameter. I have to use a dB-Eater in it to have 96dB at about half rpm in half a meter distance of the microphone. Without the dB-Eater it is still well sounding at 98 dB, but to loud for my favourite race track.

    I am using the Mikuni TM34-120 with K+N single pods, an electronic Sachse ignition (german manufacturer) with 9 preset ignition curves to select by potentiometer. Max. enhanced firing at 38° BTDC, but 36° BTDC is fine as well. Rev limiter set to 7.800 rpm.
    Major change is the exhaust camshaft modified to use as intake camshaft. The engine is eager to turn with high rpms.
    This still stock 750ccm engine doesn’t even has other pistons, higher compression ratio nor larger valves or ported in- or outlet ducts.
    I am using still 4 liters of 20W-50 mineral engine oil. No overheating even at 35°C in summer.
    Rich jet setting may add some cooling to the engine. Just added two air-guide-tubes unter the fuel tank to route fresh air to the air filters.

    Ok, next engine, a 906ccm, since years on my workbench. It has the same piston and barrel set as the tuning engine I’ve shown above (sister engines). I struggle to put it together as I want to create a small series of modified balancer chain guides, but that takes it time as well.

    Used “play dough” (clay for children?) to determine the gap between piston, valves and head an to find where to reshape the combustion chamber:

    This head was ported and when the mechanic should drill a hole and thread for a second spark plug per cylinder the milling maschine cut away other essential parts and this head is dead, to bad !

    Ok, the 906ccm tuning engine that I’ve bought. Not well documented but everything is touched.
    I will fit it this winter into the “Vienna” and will tell about it after first race event end of April 2020 😉 Not sure about the exhaust routing, the external oil line do not allow to use the existing exhaust as it is. Had Peter to make me new downtubes routed under the engine and I have to add a silencer, but that would distort the look of the Vienna. Better to have a distorted look and a powerful engine than other way round 😉 That’s racing !

    The oil lines are routed in tubes outside of the barrel / cylinder block and head. You can see in one picture far above, that there is an orifice used in the oil line. It has the same inner diameter as the orifice used in the stock engine betwwen cylinder block and head.

    Next tuning engine is the one that is still mounted in a Twin that I have bought recently from Manfred. 950 ccm ! A real beast, very powerful !
    You can find pics and detailed information here:
    https://www.z750twin.de/Manfreds_LTD.htm

    Ok, so much for now 😉

    Cheers, Michael

    #25367
    Michael
    Participant

    Hi Doctorot,

    welcome back and congrats to your very nice Twin !

    I am sure it is a lot of fun in the mountains with it 😉

    Cheers, Michael

    PS: In regards to engine tuning I can support you with some information. On our german Z750Twin community website there is a portrait of a Twin I’ve bought just last week !
    Manfred built it and there is a lot of documentation in the lower part of that story. Maybe Google will help in translating that.
    https://www.z750twin.de/Manfreds_LTD.htm

     

    #25346
    Michael
    Participant

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

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

    Cheers, Michael

    #25338
    Michael
    Participant

    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 😉

    #25329
    Michael
    Participant

    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 !

    #25316
    Michael
    Participant

    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>

    #25297
    Michael
    Participant

    Hi Colin,

    welcome to the Lonesome Twins and thank you for your introduction.

    Looking forward to see pics of your Twin.

    Best regards, Michael

    #25293
    Michael
    Participant

    Hi Ed,

    there is Peter in Germany who is making down tubes from stainless steel.
    They can have different angles and diameters at the rear end to match your desired silencers.
    They do not have an interference/connector tube from left to right.

    Let me know if you are interested.

    An unpolished pair is around 280,- Euros, a polished pair is around 480,- Euros.
    Shipping cost not included.

    Cheers, Michael

    PS: Picture shows my race twin two years ago with Peters downtubes, unpolished and road legal silencers.

    #25290
    Michael
    Participant

    Hi Bob,

    even if there where only a few bikers and bikes, there were very nice people and bikes.

    Well done !

    #25285
    Michael
    Participant

    Well, I didn’t manage to fit the tuning engine into my racetwin by now, so I will do it this winter.
    Had the last track days last week and besides the GPZ 305 I rode my “Vienna”:


    Me on Kawa Z750Twin, #676 and my son Nils on Suzi SV650S, #650


    I’m behind my son, ready to overtake him and the driver in front of him at the inside 😉


    battling a Kawa ZRX


    “Fast Nils”


    “Lucky Me”


    Four days on the track (two in Chambley/F and two at Spreewaldring/D) and the rear tire is done. Until here the grip was fantastic and I will use the Conti RaceAttack Comp. End. again.

    There will be some work to do during this winter and the race season starts again in April 2020!

    Cheers, Michael

Viewing 15 posts - 1 through 15 (of 1,040 total)