INTYLER V 15 ci

Hello. I have replaced my YAMAHA Virago engine with INTYLER 15 ci. The Intyler 15 ci also comes with original KEI HIN carburator. I'm interested in the transmission drive.Should I change the rear sprocket on my Virago or can I keep the same sprocket.I was advised by INTYLER dealer to replace the rims too.They have this great looking 3inch wheels.