A year after the release of BT5 engine from Orcan the .21 off-road engine has undergone further development and will be offered in an optimised version called BT5 Plus. Beside a couple of detailed improvements, the most important step comes from a new carburetor. A special idle needle screw makes the adjustment easier and also creates better response characteristics especially at low revs which is a very important aspect in off-road racing. Featuring five ports it comes with a combustion chamber for turbo plugs. As usual for Orcan engines, which are exclusively produced by Novarossi for SMI Motorsport, the BT5 Plus power plant comes in a handy Orcan multifunction bag.