Originally Posted by Poinas2

If it's pull-start then it's Sport/RTR and most probably 3port. As you are based in UK you can contact your local shop or disti. Majority of the engines use same parts across the line so you should be covered. For sure sleeves are different etc. Does it have the UK disti serial# on the case ? Did you buy it used if you did not get the leaflet or was it coming with a car ?