Re: 39cc to 46cc engine upgrade - how much power?
Hmmm I will check that out, I am in the UK, I have seen that petrol scooters and funbikes have the upgrade kit for about £40ish which has the head, piston and cylinder, so basically a full top end rebuild that I need anyway.
Are there any larger kits than that?
If there are larger kits available for air cooled perhaps it might be worth me looking at those? Although a 49cc air cooled is half the power of a 37cc water cooled lol