difference LML reed valve v rotary vespa

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This topic contains 4 replies, has 2 voices, and was last updated by  Jamie 10 months, 1 week ago.

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  • #16752

    Jamie
    Participant

    I am still trying to smooth out a bogging area on my lml pinasco 177, slight bog on low throttle then off like a rocket to around 60mph. Shutting off, i do not get the normal sound of the engine thud, thud, thud to tickover. But will immediately respond on throttle to accelerate, it can be a bit sudden. I have never had a reed valve engine before, does it cut fuel off immediately during throttle off, or does it allow the engine to fire until tickover. On my lambretta on shut off i would have a pang,pang until reaching engine tickover. I hope I have explained it without you thinking I have lost it, but I am old generation and listening was the main way to tune. The lml is just sounding different. Plug chop nice brown, down to 110 main jet, could it be the idle jet? I am using the pinasco recommended jetting. Hope someone can advise.

    #16753

    Roosevelt
    Participant

    I know what your saying, an old BSA Bantam d10 I had, did the whole slow pang- pang- pang thing until tickover (used to love that sound) but my LML never has. It seems to reach idle quicker much like My Honda H100a which is also a reed valve 2t. Sorry, but I’ve never had a non reed valve Vespa / Lml to compare.

    #16754

    Jamie
    Participant

    Thanks for your reply, at least I am not nuts!!! You knew what I meant at least. My previous vespas would thud , and then thud,thud and so on, on long shut downs to a junction from speed. My lml doesn’t, but if I touch the throttle it responds instantly. Everything seems fine, just my first reed valve so I am confused if still too rich or just the idle jet, or if it is normal. Sounds that it is a reed valve thing, that is closing to conserve fuel when not needed.
    any other opinions out their? cheers Roosevelt

    #16755

    Roosevelt
    Participant

    Just an idea, how about watching some Youtube vids. Bound to be someone with a similar setup to yours?

    #16756

    Jamie
    Participant

    Cheers great idea, think its a bit rich, now just getting funny looks as I am listening to revving vespas on my tablet!

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