Piet’s Simonini 4p

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Dit onderwerp bevat 59 reacties, heeft 23 stemmen, en is het laatst gewijzigd door zevenenergie 9 maanden geleden.

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  • #261884

    Topic starter
    Berichten: 1070

    DR-flenny forced ma to post my birthday present here.

    gasket need some rework to fit

    the small Malossi inlet will be changed by a Stage6 with larger membrane for a 24mm carb


    Berichten: 4077

    Haha No No!

    I did not force anything and next to that i did not say HERE.
    This is a Perso ;)! So you need to enlighten us with more informations on your plans and the future of this engine.
    What moped etc More pictures and more explaining mister mister!


    Topic starter
    Berichten: 1070

    DR-flenny forced me to put it under a Grillo :whistle

    For that I have two options


    Berichten: 2714

    The flowers go realy nice with the Simo engine 😀 😛


    Berichten: 3593



    Berichten: 1420

    Das sieht ja gut aus, wie immer 😉

    Ich nehme an dass du im Zylinderkopf auch ein Dekoventil ein baust?


    Berichten: 3620

    Nice birthday present!! But i would not say the same about the Flowerpower Grillo so if i can vote i vote for the blue Grillo as i like it :).


    Berichten: 63

    for sure the flowerpower:D


    Berichten: 9942

    Yeah 4 sure the flowerpower Grillo:thumb:lol


    Berichten: 500

    I’m green :lol take the flowerpower indeed…


    Berichten: 1103

    Looks great:thumb


    Topic starter
    Berichten: 1070

    short update after a while.

    As I heard negative experiences with new Simonini krukas I decided to order a 46mm stroke Sprocatti krukas.

    If you compare the connecting rods of a Simo krukas (top) and a Sprocatti krukas(bottom)the Sprocatti looks much more durable for a 81,5cc engine.

    also the Sprocatti connecting rod has a slot in the piston pin bearing area for greasing

    then I made first rough pre assembly of the components. There need to be some rework on the piston in the marked area

    also there is not much gap between piston on lower end position to the carter.

    the piston window is not complete open compared to the window in the cylinder

    and looking through the inlet side, there are cylinder and piston blocking a nice gas flow. This will need to be reworked as well.


    Berichten: 6571

    You’ve tried to made visable the differences between the Simonini and Sprocatti cranks, but it looks like you have not the new type Simonini 46mm stroke on photo. Your crank by the looks of it, looks more like a 44m stroke?

    A new type Simo 2007 crank looks very similar to an Sprocatti crank.
    Still like to know which connecting rod Sprocatti uses as it looks like they cut of the old logo or branding.

    Some reference:


    Topic starter
    Berichten: 1070

    yes, that is my old 44mm Simo crank.

    Didn’t konw the Simo crank look similar now. But I have heard from a PMT member that he bought a new Simo crank with bad bearing passing.
    So I decided not to buy a Simo one.


    Berichten: 1420

    That is true. I’ve had several different (NEW) Simonini crankshafts that all had bad bearing clearances.

15 berichten aan het bekijken - 1 tot 15 (van in totaal 60)

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