I scored a 2005 PX150 last year with only 300 miles on it and have since put on about 1000 more. I've put on a Polini box exhaust, the bigger SI 24 filter and rejetted. This gave a nice boost, but of course I'm looking at the next level. It's 2021 and there are dozens of cylinder kits available, especially if ordering from Europe.
Here are my criteria:
1. Aluminum cylinder & head
2. Keep offset plug
3. Broad torque range rather than high peak, though I would like to increase top rpm
4. Would much prefer to keep electric start and ring gear
5. Keep stock crank
What kit would you reccomend and why?
I'm also considering just porting & setting squish on my stock set, nothing to lose there.