Hi,
Check out
www.rhpk.co.uk its the website for the Rye House Pro Kart championship, or look them up on facebook. They run a 4 hour endurance race on the second Saturday of every month.
Rye house is about an hour and a half from Whilton Mill and there are teams that travel from all over the country as it's probably the best championship for that type of racing.
If you can find a couple of mates so you've got 3 drivers, expect to put in about £150 each and that should cover: Tyres, fuel, entry fee, testing and a little spare for travelling/food/kart-costs/upgrades.
You will get 2 hours testing, 30 minutes qualifying and 4 hours of close racing. There is literally all types of competitor, from big teams spending lots of money to young guys turning up with a £500 kart and no experience.
There have been races won by 4 tenths of a second and at the last race I crossed the line fifth, 0.008 seconds ahead of our rival in the championship, after 4 hours of racing and 2 driver changes!
You won't want to go 2-stroke when you're having fantastic racing!