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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Music:
The Emperor's Army - Jeremy Blake
2 Hearts - Patrick Patrikios

[EvilCoffeeCompany]

Love our 2020 300xc TPI, very rad look at the development

[Danger_mouse]

Only the 2020 TPI actually corrects mixtures for altitude while riding....
The Earlier models only measure atmospheric pressure at start up and then disregard the sensor while running.
This is why some owners bike run poorly while others run fine.

[sowieso]

haha crazy to see how much time they investetd to create a perfect fuel injected bike! but it was worth it they are sooo good.

[EeeBeee]

Fuel savings Not 30-40% more like 13-14%

[Orvz]

We sure hope that the Japanese brands will also make fuel injected 2 stroke bikes on motocross, cross country and enduro type bikes, just to bring them back in that manner.

[mb]

outboards got fuel injection in the 90´s. there are many di two stroke engines. tohatsu tldi, yamaha hpdi, evinrude e tec just to name few. also snowmobiles got similar engines

[chillozz]

mmmm not the real first company with a 2 stroke injection... i have a 2011 ossa tr280I.. A trialsbike what is olso a 2 stroke with injection.

[jorgeguillot]

Muy interesante, el próximo con subtítulos en español, por favor. Gracias.

[michail]

i have 2017 300 exc with lectron. i dont touch the carb all yr long, I also ride at 400m asl as well as 2000asl with no issues and no need for adjustment. I get very good mileage. all that without 3kg of electronic crap subject to failure

[robertwillis]

KTM styled their Transfer port injection system after a New Zealander's EFI YZ250

[garydetaeye]

im surprise this didnt happen sooner my 1972 ts 250 was oil injected what was the hold up with the fuel

[stanislaveminger]

I have 2020 300 exc and the bike is just perfect feels almost like 125 with tons of power and nice response just love it 👍👍

[Shadowfdath]

I cant believe EFI 2 strokes werent made widespread before the new regulations in 2006...Even Polaris had an EFI snowmobile in 1991, and by 1999 they had a 32bit ECU controlled, sequential firing DIRECT INJECTION, 135hp 3 cylinder 2 stroke injection in 1999 on a 1200cc jetski! (Genesis 1200)

It cost the EXACTLY the same MSRP as the slower and less stable 130hp SeaDoo GTX and weighed the same too. Only issue was the computers werent fully watertight and or would have chips go bad from overheating!

[adambatchelder]

What you are calling di sure looks like injectors in the cylinder like tpi?

[sidecarbod]

Hmm, oil tanks that crack and oil pumps that fail, I'll stick to my carb'd 300 thanks. In fact the wiring on the carb'd bikes is pretty poor, really thin brittle wires are used, TPI must have a load more wires so I hope they have improved the quality of the loom.

[simsonschrauber]

Would be interesting if there was not this awful slavic house music in the background...

[dougiequick]

What might a street version of this motor be like? Side by side 300cc motors on a common crank? Or side by side THREE 250 motors on common crank! Be SO fast! But with modern electronics could also be ridden tame as a kitten if so desired ....a rain mode a mild mode, a street mode and of course a full power crazy Track Mode The RC3!

[reddat]

aside from emissions the Keihn carburetors fitted with STIC metering block on traditional two stroke dirt bikes make the TPI injected two strokes obsolete in my opinion and overcome drawbacks normally seen with carburetor fitted 2-stroke dirtbikes

[JohnSmith-djgf]

It’s cool and all, but I’ll stick with a lightweight and simple YZ250X.

[leemitch]

perhaps that home made system you didn't have any more info about, has more to do with the KTM TPI than you