It was ported and polished with a set of custom chambers, and had racing reeds and rejetted carbs! The chambers were huge and scraped a bit from time to time but they made the powerband come in quicker and stretched it out till your cheeks were wrapped around your ears! All work was performed by 'the late Dennis Latimer of OKC he was a 2 stroke wizard and built me this dangerous beast, but it was lots of fun! I sold it along with a restored 250, 350, and another 400. As well as a suzuki GT250, 500, and a K1 kawi, and a 1976 suzuki RE5 rotory engine motorcycle! A divorce forced the sale and my heart still breaks! I loved them all, not the ex-wife but the bikes, just to be clear!