smallframe primary gears

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handofdave
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Posts: 83
Joined: Fri Jun 10, 2011 11:35 pm
Main scooter: li ts1

Tue Oct 22, 2013 9:00 pm

hi,
just converting my wifes 90 and have got a 125 barrel 19mm carb and sports exhaust, i am about to put in a 4 speed box and would like to know if i should up the primary gears from the 90 to the primavera?would this give her a usable bike that still pulls without revvimg to much?
cheers
dave

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wack 63
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Joined: Fri Nov 27, 2009 9:33 pm
Main scooter: '71 GP TS1
Location: Lincs
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Wed Oct 23, 2013 8:22 pm

You can use the smallie gearing calculator link on this site to see the differences but I would fit the Primmy primaries.

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jonny snatchsniffer
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Location: camberley, surrey
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Sat Nov 09, 2013 3:05 pm

i wouldnt use the 90 primarys as they are far too short, the primmy/pk125 primarys will be fine, they are 24/61, another option is 27/69, a little shorter than 24/61

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