Hi, I have a '05 PX with a Polini 177 kit, 24mm carb, polini pipe and a racing crank (cut) Mazzuchelli), I matched the ports and the timing was left original (18°), I installed first a 26mm carb (24 modified by SIP), but with a 125 main jet, it was too lean so since I don’t have bigger jets in stock, I reinstalled the 24mm with a 125 main jet. I rode it for 100km when I had a soft seaizure at around 100 km-h…I removed the piston and cylindre, cleaned with a file and sand paper the glazed and hardened spots, and resinstalled that. the mixture looks fine, but today, at less than 95 km-h, on a flat road, I had another seizure…
now, what’s your suggestion? I found a 130, I didn’t try it yet, but before to ruin anything else…what’s your suggestions?