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Hi Raffspeed! I intend to do this also on my AC3, Pinasco 160 is a good choice.
The piston ported engines are 5%. The rotary valve emgines are 2% with some excetions.

Hello, could you tell me the dimensions of the central glass? Mine is an AC3 with 3 parts windshield but they are missing. I want to cut a square glass for the middle and two PC for both sides.
Thank you

Hi Alex, do you notice any improvement whith the late piston? Is the cylinder head the same for both or must changed as a pair?
Thanks

Hello, My ac3 engine was working with the deflector nose shape piston like the oldests models but as i saw on the parts manual the ac3 piston is the same as the ac4 model with a smooth rounded head. I am not sure if the cylinder and head are the same for both and if i can change for the ac4 piston. ...

Thank you mondoape!

Ken yes i did saw this one. The price is a little bit high for here plus about 500 usd for papers.

Kjjohnson very nice photos, thanks for sharing! My vespacar is there!! That was his old house, before i bought it! Photo 72

Hello, my name is David, from Brazil and i love Piaggio Ape, Vespa, Lambretta... I like to do all the job on my restorations from body/paint work to full engine rebuild. I bought the AC3 model 8 months ago for total restoration, you can see it on the picture, it was working but in very poor conditio...