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Post by oldscooterbloke on Jun 20, 2020 21:37:27 GMT
Hi,anyone know if there are any tuning kits for the above bike , due to the cylinder case spigot hole size difference to a later 90cc.
would like to increase the power. cheers
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Post by exmayor on Jun 20, 2020 23:10:46 GMT
There are a couple of things you can do. Both of them require splitting the cases and installing a crank with caged bearings in the small end. First if you can find a 100 Sport top end, the spigot on the barrel can be turned down to fit the small small spigot. Secondly, while the cases are split you can have the spigot hole milled out from 56mm to 61mm then with the crank change you can use a 125 top end. Keep in mind that it will remain 3 speed and have a top speed of 50/55mph. I had my case bored and a 100 sport top end installed with a 19/19 carb and a polini snail cline exhaust. Will run an honest GPS 50 mph on flat ground. I’m going to have my motor builder install a port matched Pinasco alloy 125cc 7 port top end. With a polini CP 19 carb and a SIP banana exhaust. Here is the link to me ‘64 build modernvespa.com/forum/topic161685www.sip-scootershop.com/en/products/racing+cylinder+pinasco+125+cc+_79400000 |
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