When I bought mine I was told the stock carb was 26mm, and if you change the header to the non cat one, they also change the carb to 28mm when new. This could be wrong though.
My bike has had a few rides in the past couple of weeks. I got a Pirelli Sport Demon 110.70.17 tyre on the front. Actually I sent my dad to Zhongli Motorbike to get a BT39 but instead of just doing what he was told, he noticed the Bridgestone was tubeless fitment and didn't get it (doing me a favour!). Anyway it's going fine. It feels a lot quicker steering, and also more stable, than a standard maxxis front with 13,000km on it that's totally bald on the left side. How it would compare to a new one I don't know. I had both pegs down no worries last weekend on the 118 though so I think it's a definite improvement.
I think the standard Maxxis rear is $2500 at the CPI shop in Taoyuan.
My carb has started doing that uneven idle thing again, pulling up to traffic lights and it's sitting there at 3300rpm. Maybe my carb's fucked too. How can the carb on my wife's scooter do 14 years and 79,000km and still be fine?
I went to get a new throttle cable today because mine is feeling grindy and fucked. I saw a customer there with a brand new SM250, still had the paint on the tyres and everything. It looks like the only things they've changed in the past three years is the rear mudguard shape, the front disc shape, the rear brake caliper and the headlight design, and also the cosmetics. It could be different inside but externally it looks like the exact same bike save for those things.
I'm considering changing the throttle to a slightly quicker action one... anyone else done that?