Our good customer Sven came ob saturday to show his new Vespa Spezial.
A real stunner. And the clours work together pretty well, especially with the nice bgm PRO SC shockers!
At the dyno we checked the engine and its power output! There is no porting work done to the barrel. It went to the casings completeley Plug & Play!
The port timings are transfers 128° and exhaust 190°. This gives a blow down timing of 31°. With slightly more blow down timing the exhaust Big Bertha would work even better. Maybe we will see Sven reworking the port timings in the future!?
These are the selected engine parts:
Cylinder kit: Parmakit SP09
Crankshaft: BGM 51/105
Carb:Keihin PWK 33
Exhaust: Big Bertha
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