GP Chain question

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diesel
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When changing to a twenty toothed front sprocket on a sil gp200 do I need to get a stretched chain or add a link? The chain thats on it has done 4000 miles might it fit?
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mick1
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i've got a 20 tooth front and 46 rear. I've put a 83 link chain on with a Rocho down-push tensioner....fits fine and runs fine...
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DaveTomo
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20X47 83 link
Image
I am playing all the right notes, but not necessarily in the right order.
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diesel
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Playstation gamer tag: speilekorps
Main scooter: lambretta li 150 s1 1958
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Thanks Lads
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