Hi, I have a 1995 Yamaha BWS CW50. The old standard exhaust is leaking, so I'm looking at changing it. I have seen a TECNIGAS NEXT-R Exhaust for sale, but I've been told I will need to fit a bigger carburettor jet and may need to do something with the oil supply, or I risk engine damage. I'm wanting a little bit more top speed, as it's a bit dangerous on the main road. At the moment the speedo reads a maximum of 33mph and the scooter always feels like its being restricted. I live in a hilly area, so I still need power to get up the hills. Is there a way to find out the size of the standard jet and how much bigger do i need to go? Also, how do I make sure that the oil consumption is sufficient? Thanks
Usually tacit advice is given by manufacturer regarding jetting, inadequate oil supply for mildly tuned engines can be overcome by underperforming oil pumps by pre-mixing (adding oil directly per tank) at specified ratios.