1962 VBB rebuild w/ Pinasco 177, 60mm crank, bgm piston

2-port Pinasco 177
60mm crank
BGM piston
190 degrees intake duration
185 Exhaust Duration/124 Transfer Duration/31 Blowdown

[@GScootersKita]

mantab nih mesinnya garasi scotters kita

[@rideyourdamnbike]

Sounds great. What is the benefit of the BGM piston?

[@ChandlerHowell-Vespa]

Benefit is two-fold: 1) It has 1mm vs. the stock 2mm rings, so it can rev past 8,000 RPM's without the rings floating and risking a seize 2) I needed a new piston for it and had a spare BGM on the shelf

[@alanwira8946]

Apakah sampai kecepatan 100 kmh?

[@ChandlerHowell-Vespa]

This motor probably could do 100 kmh, but I never tested it. The motor that's in it now has done 103 kmh, and that's with 10" gearing on a 8" wheel.

[@xperimental1974]

what are the drawbacks of 2 port compared to 3 or 5?

[@ChandlerHowell-Vespa]

At the most basic, two ports means less room for fuel/air mix to enter the cylinder, on on each side (L & R) of the cylinder w/ the Exhaust on the bottom. The third port is called the "boost" port and adds a port on the top, which allows the mixture to better push the exhaust gases out the exhaust port. And a "Five Port" is really just a three-port, but with the 3rd/boost port split into three channels. Maybe it's time to do a quick one-off video on cylinder ports. :)

[@SuperMonik]

@@ChandlerHowell-Vespa what exhaust is this?

[@ChandlerHowell-Vespa]

@@SuperMonik It's a SIP Road 2.0. Lots of folks run a Polini box on 8"'s, but I had the Road 2.0 on the shelf, so I just used it.