KTM EXC TPI Fuel Injection: How it Evolved

A lot of years of work and effort have been invested in this system, after almost 14 years ktm came up with a solution that works. The first version of fuel injected 2 stroke was called the orbital, the engine behaved very strangely and did not have the classic sound of a 2 stroke engine. It was also very difficult to fit that system into the existing engine chassis. So they gave up on that solution because they believed that customers would not buy such an engine with strange working performance. The second version was called DI System, which would mean directed injection. The system is almost the same as the TPI, but the difference is that here the fuel is injected direct into the cylinder and with the TPI it first goes to the transfer ports. This system worked very well, even ktm intended to put it up for sale in 2015. On the 250EXC it was almost perfect but on the 300EXC the engine overheated and so they gave up on this system. After that, they tried not to inject fuel directly, but first into the transfer ports before the piston. The solution proved to be the best, and so the TPI project was born. Ktm perfected it for a couple of years and then put it up for sale with name of EXC TPI models.

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The Emperor's Army - Jeremy Blake
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