Suzuki 250 Racer Build pt9: DIY 2-Stroke Porting with Garage Tools (Race Engine Build)

Description In this video I go through the first version of the cylinder porting on my 1973 Suzuki GT250 2-stroke race bike. I start by making a port map from the stock cylinder, then analyze it with my own DIY software, re-design the porting to satisfy STA target numbers, prepare port map template, and finally do the actual porting work. Stage 1 porting is kept relatively mild — I want to proceed in small steps and compare performance gains along the way. Still, the bike ran surprisingly well, even against water-cooled Yamahas, before things went wrong… 📌 Chapters 0:05 Intro 0:29 Info 0:48 Making Port Map from Stock Cylinder 2:24 Port Map Analysis with DIY Software 5:04 Porting Template Preparation 6:15 Attaching the Port Map Template to Cylinder 7:36 Porting 11:40 Making the mistake 12:16 Cylinder Port Cleanup 13:07 Stage I Performance 13:57 Analysis: This is what went wrong 17:15 Stage II Porting plan 17:37 Next time: Cylinder heads 🔧 If you need anything made from laser-cut steel or aluminium, or even help with the design, feel free to contact me at [email protected] Tags Suzuki GT250, 2-stroke porting, two stroke tuning, cylinder porting, port map, STA calculation, DIY engine tuning, vintage racing motorcycle, classic road racing, piston port engine, Suzuki T250, Suzuki GT, Gordon Blair 2-stroke, Frits Overmars formula, motorcycle restoration, DIY porting, race engine build, premix lubrication, 2 stroke performance, motorcycle porting tutorial Hashtags #2Stroke #SuzukiGT250 #ClassicRacing #MotorcyclePorting 🎵 Music Nathan Moore – The Dance Before (YouTube Audio Library, free to use – no attribution required) Kevin MacLeod – Manic Polka Licensed under Creative Commons Attribution 4.0 https://creativecommons.org/licenses/... Source: http://incompetech.com/music/royalty-... Artist: http://incompetech.com/