DIY Porting

[banshee1999]

A few months ago, I bought a banshee sight unseen, which was probably my first problem, and only rode it for 3 days, each day something went wrong, and on the third day, I blew a base gasket and overheated the engine, melting the pistons to the cylinder walls. Anyway, I bought brand new Niche cylinders + head, Wiseco pistons, V Force reeds, and a hot rods crank. The old crank was probably fine; it was a Wiseco A1 crank, but it was at the upper limit for big-end connecting rod side clearance. This full backstory ties in with me knowing the owner of the Yamaha dealership near me, who said that porting was the way to really wake up a stock bore banshee. he said that he had his sent out to I think one of the sponsors on here, but his is also a big bore 520 or something. I am fairly mechanically inclined, as I have tinkered with things since I was a kid and am currently in school to become a mechanical engineer, so I decided to do my own very slight porting on the new cylinders. Porting is such an in-depth topic, so it really led me down a rabbit hole, which showed me that I really have no clue what I'm doing and that I really should not go crazy porting on these cylinders. I ended up coming across a video from Herr Jugs Racing called "Banshee porting 101 simple start" which is the video I followed much exactly. I raised the exhaust port roof about 2mm and widened the exhaust port by about 3mm. also cleaned up the intake port a little bit and knifed the divider a little bit.  just wanted to come in here and show my results and get some feedback for if I ever do this again or if it will blow up immediately after building it. 

[smsurid]

Love the more frequent videos Dave. I can honestly tell the quality improvement with each video and can tell you are way more comfortable on camera. 👍 Being a Honda boi myself..