Scooterotica

Train Driver wrote:I know they are completely different TS1/RB RT but I was thinking of going to a 24mm mikuni for my RT 255, less fuel lots less

nelson pk wrote:The main jet has the biggest effect at 3/4 to full throttle but to say it has zero effect at 1/4 to 3/4 throttle is incorrect.
If you think about it the whole main system is fed via the main jet so reducing this size will have an effect on lower positions. Reducing your main jet size to clean up your mid range when you need to use bigger needle/ atomiser combos is quite a common trick but you do have to be very careful so as not to run dangerously lean at wide open throttle. I would never attempt this without some sort of gauge to let me know whats going on. If you think about it, which part of the jetting is more important to get rich and safe? Well thats answered by your riding style. do you spend most of your time cruising at half throttle and just under or do you ride everywhere at full throttle?
If you ride everywhere at full throttle make sure your main is a little rich and be careful when you throttle off. If you cruise at half throttle or under spend more time getting the needle/atomiser rich enough for this.
Just one other question to reinforce my point. How come most riders hole a piston or seize when cruising in the mid range?

The X2 is on the top clip by the way.
Pete