SX3’s Ciao perso [English]

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  • #789268

    Martino
    Bijdrager
    Berichten: 6650

    Mine Athena crank is still in the box on the shelf. And it will stay there a bit longer.

    Indeed this looks of, but not uncommon in the world of Piaggio/Vespa. It is known Polini cases and Malossi as well have problems with a flywheel which in combination of an aftermarket crank will scratching the cases. Try the new Pinasco flywheel and it’s even worse.  Another option is mill something from your flywheel so it runs freely.

    I thought you said building was the most fun? 😎

    #789284

    sx3-swe
    Topic starter
    Berichten: 258

    Maybe it’s best for it to stay in the box and look good. 🙂

    Building is one thing and paying top dollar and having to “fix” it is another. 🙂
    Sometimes I just want to invest my self out of a problem, instead of building it from scratch. But I expect the parts to be within decent tolerances. 1mm off compared to original crank isn’t acceptable in my opinion, and I don’t want to modify other good parts just to fit a faulty part.

    Damn, i feel anxiety when something comes out 0,05 mm off spec, I wonder how theese guys even can sleep at night when having 1 mm as tolerance during quality check. 😀

    I’ve tried both the OEM flywheel and Pinasco, they both get stuck. I have opened a ticket from the shop I bought it, see if they’ll accept the return.

    #789561

    12V
    Bijdrager
    Berichten: 37

    Have you tried the original flywheel, to check if you have less vibrations?
    The Vespa engine uses the flywheel as a part of its final balance factor, because the crankshaft has the rotary inlet cutout where the counterweight has to be.
    To my understanding, the pinasco flywheel is neutrally balanced, the original ones aren’t.

    And btw, i only buy Mazzucchelli crankshafts, never had any problems with them. The standard one (AMT002) will give you about 172° of inlet timing in a Speedengine. Runs fine like that, or expand it a little to ~185° or whatever you like.

    regards, Carsten
3 berichten aan het bekijken - 226 tot 228 (van in totaal 228)

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