> Daniel '' Wrote:
> -------------------------------------------------------
> Enlarging the ports and matching the flanges will get you a little, but
> if you do not alter the port durations the gains will be negligible.
> Just re gearing, a side bleed estoril with an upjet will get you into
> the high 40s. With a proper port job and a solid tune a stock a55 top
> end can get you u into the mid 50s.
Exactly. Don’t just bore the holes bigger. I have seen lots of kits where people just made bigger holes and fucked up the port timing to where it was running better stock.
https://www.mopedarmy.com/forums/read.php?7,4153651,page=2
Andy and I did some porting a few years ago on some A3s. I actually did a port map and did one for what I usually do with an A55 cylinder. It may be useful. (edited)