Vespa Pk50?

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    Jamie

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    Vespa Pk50?

    Post by Jamie on Mon Aug 20, 2012 12:34 am

    Hi guys, im thinking of getting a Pk50 project after mersea. i was just wondering what kind of engine potential they have. can you fit a 135 on a 50 bottom end , how easy is it to get parts ect....
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    NorthernJordan
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    Re: Vespa Pk50?

    Post by NorthernJordan on Mon Aug 20, 2012 3:44 am

    I think you can, but you will need to change the crack to a pk125 type one? Im sure shaggy will correct me.


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    Skajosh

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    Re: Vespa Pk50?

    Post by Skajosh on Mon Aug 20, 2012 3:46 am

    In simple terms.
    You change the 50 crank to a 125 crank (aslong as it's the right cone size for the flywheel)
    you change your primaries.
    you use a 4 plate clutch and a reinforced spring.
    you get a 130 or 136 kit or whatever.
    you get a bigger carb and manifold. 19/19 is the smallest, many go for the 24mm dellorto.
    You get a decent ignition (vespatronic, parmakit)
    easy.
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    Skajosh

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    Re: Vespa Pk50?

    Post by Skajosh on Mon Aug 20, 2012 3:47 am

    NorthernJordan wrote:I think you can, but you will need to change the crack to a pk125 type one? Im sure shaggy will correct me.

    Doesn't have to be an PK crank.
    Can be a primmy crank aslong as it's a 51mm stroke.
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    NorthernJordan
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    Re: Vespa Pk50?

    Post by NorthernJordan on Mon Aug 20, 2012 3:50 am

    Close but no cigar.


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    ttscshaggy

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    Re: Vespa Pk50?

    Post by ttscshaggy on Mon Aug 20, 2012 4:08 am

    Dont forget the cylinder studs, headcowl and bits and bobs Smile

    you should always try to keep to pk crank cone size (20/20) or Ets (24/25) They both support the same flywheel. These are stronger.

    There are lots more options with cranks if you want to up the game abit more.
    51mm stroke (97mm and 105mm rod)rotary crank
    53mm stroke (97mm and 105mm rod)rotary crank (bigger webs)
    54mm stroke (97mm, 105mm and 110mm Rods) Full circle cranks(crankcase machining for bigger webs)
    There are also the mazzy full circle 51/97 cranks that need no machining to fit, But these are shite !
    As with the majority of mazz cranks. Big end pin tolerances are shite. Genuine piaggio are abit better.

    Of course with upping stroke and longer rods, packer plates need to be acquired or made to suit. Port timings change and need to be looked at and changed if need be.
    With longer strokes you get better area for exhaust port size which is a massive plus!

    Kit wise , if you want something better than the obvious polini/malossi/Dr there is a small selection of kits around the same price.

    Parmakit 130 Ecv
    Pro Cup 125 ( quatrinni M1 Copy)
    Polini Evo
    All these are ally kits
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    Skajosh

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    Re: Vespa Pk50?

    Post by Skajosh on Mon Aug 20, 2012 8:24 am

    ttscshaggy wrote:Dont forget the cylinder studs, headcowl and bits and bobs Smile

    you should always try to keep to pk crank cone size (20/20) or Ets (24/25) They both support the same flywheel. These are stronger.

    There are lots more options with cranks if you want to up the game abit more.
    51mm stroke (97mm and 105mm rod)rotary crank
    53mm stroke (97mm and 105mm rod)rotary crank (bigger webs)
    54mm stroke (97mm, 105mm and 110mm Rods) Full circle cranks(crankcase machining for bigger webs)
    There are also the mazzy full circle 51/97 cranks that need no machining to fit, But these are shite !
    As with the majority of mazz cranks. Big end pin tolerances are shite. Genuine piaggio are abit better.

    Of course with upping stroke and longer rods, packer plates need to be acquired or made to suit. Port timings change and need to be looked at and changed if need be.
    With longer strokes you get better area for exhaust port size which is a massive plus!

    Kit wise , if you want something better than the obvious polini/malossi/Dr there is a small selection of kits around the same price.

    Parmakit 130 Ecv
    Pro Cup 125 ( quatrinni M1 Copy)
    Polini Evo
    All these are ally kits

    As you can see by his knowledge, Ian still doesn't have a boyfriend.

    But, yes I shall agree with him. The last 4 kits he mentioned do have a massive difference compared to the standad 130 polini and malossi kits. However, if you are a massive tinker and do wanna play with and try get more power from the polini 130 or malossi. Then do the research and give it a little go.
    Someone on the smallie forum got 22hp from the polini 130 barrel. They give about 12bhp standard.

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