Hand finished crankcases Lightweight and die cast clutch casing clutch inspection water pump and ignition covers Aluminium water pump rotor Billet machined crankshafts running on roller bearings with hi tech crank seals Friction reduction coated pistons High performance long lasting clutches Cush drive clutch baskets Friction reduction hard coated clutch baskets Friction reduction hard coated gearbox selector fork tips Hardened treated gear shaft parts MX EN gearboxes with differing ratios 5 and 6 speed with options available on MX SMX models Hydraulic clutch actuation V Force reed blocks Keihin carburettors MX SMX FT Emoticon controlled TBi fuel Injection systems with separate electronic control oil distribution Electric start Balancer shaft HGS Exhaust systems with plated expansion chambers on EN Road models TMEES electronic exhaust valve control Kokusan digital variable advance ignition with twin map selection Gear position sensitive variable ignition timing power valve control and fuel injection system operation The large capacity TM Racing 250cc and 300cc 2 stroke engines are synonymous with strength and durability with each capacity engine having its own unique qualities in the terms of performance and power delivery characteristics In 2019 the engines had a total re design which featured a multitude of new and exciting additions to increase performance and ease of use for the rider these engines were then updated once again in 2020 for the release of the fuel injected variants these changes remain and are adopted across all models For the new model year we only see some small changes and revisions to these already complete engines including new crankshaft tolerances revised cylinder ports and a new balancer shaft bearing set up There are also updates specific to the Fi variants which include alterations in the fuel injection control system for better performance Whilst retaining some internal components from the exterior the latest generation engines have a whole new look and share nothing in terms of cast components and little in internal components with the previous class engine that was phased out in 2017 The complete re design of this latest engine was born and produced to accommodate numerous changes changes that include electric start on all models alongside a fuel injection option on road models with a digitally controlled oil distribution system The gearbox assembly also features friction reduction coated and treated parts to ensure smooth and precise shifting and a whole new gearbox assembly for the Enduro variants featuring 6 ratios option on carburettor models The recent addition of a balancer shaft reduces engine vibration giving smoother performance better feel and a reduction in rider fatigue The gear position sensitive ignition works alongside the TMEES exhaust valve control system with the servo mounted to the cylinder and working directly to a revised pulley system Electronic control programming alongside the handlebar mounted twin ignition map switch allows the power delivery for each of the 250cc and 300cc engines to not only be tailored by the rider on track but the electronic systems also make alterations to the mapping depending on gear selection valve position rpm and communication to the fuel injection system where applicable always ensuring the best power delivery and traction A system that is proving to be great for the hole shot and those slippery rock sections alike depending on machine and discipline of course thus allowing the engine and control systems to give the rider the required power and torque at the required time to give the best in performance in all conditions Constructed from some of the best materials for maintaining performance and reliability these already class leading engines that produce incredible yet usable controlled power and torque combined with quality ancillary components have taken themselves to a new level Power delivery rider comfort and ultimate outright performance is optimally tailored in each discipline in all conditions in a way never seen before in off road 2 stroke engines
