TPI-Injected 2Ts: FAQs Answered – Transmoto

Video TPI-Injected 2Ts: FAQs Answered – Transmoto

The all-new fuel-injected two-stroke (“TPI”) enduro fashions launched by each KTM and Husqvarna for 2018 include a protracted listing of claimed advantages: lowered gasoline consumption, automated elevation compensation, enhanced rideability and efficiency, lowered emissions, clean engine conduct, lowered gasoline evaporation, simpler beginning, smoother idling, no pre-mixed gasoline, no flooding if the bike is flipped upside-down, etcetera. And our first style check of KTM’s 2018-model 250 and 300EXC TPI (Switch Port Injection) machines on the latest worldwide media launch in Austria confirmed that these new bikes legitimately lay declare to many of those advantages.

However what concerning the implications for reliability, upkeep, mapping or the host of different questions that the introduction of this new know-how on each KTM’s and Husqvarna’s two-strokes has raised? Effectively, listed here are some solutions to essentially the most generally requested questions on these fascinating new TPI bikes:

HOW LONG HAS KTM BEEN DEVELOPING THESE TWO-STROKE FUEL-INJECTION ENGINES? KTM has been working and creating fuel-injected two-stroke engines for 10 years.

TWO-STROKES ARE KNOWN FOR THEIR SIMPLICITY TO MAINTAIN. WILL IT BE MORE DIFFICULT TO CHANGE A CYLINDER OR PISTON ON THE TPI MODELS? KTM’s problem was to discover a excellent injector place, however the inside design of the barrel has not modified a lot, so it stays easy and straightforward to take care of. A piston change, for instance, remains to be as straightforward because it beforehand was. Now, to take away the barrel, the one further step required is the disconnecting of two electrical connectors and the gasoline line that runs to the injectors. This gasoline line makes use of a easy dry-break connector, as used on KTM’s fuel-injected four-strokes. The addition of the oil tank makes it a bit extra cluttered across the high shock mount, however so far as we are able to inform, entry to key elements for upkeep or adjustment has not been materially affected.

WHY DID KTM DECIDE TO NOT USE A DIRECT INJECTION DESIGN? KTM did loads of testing utilizing direct injection techniques, however determined they had been too advanced and adjusted the behaviour of the bike an excessive amount of. KTM’s focus was on making certain the TPI bikes’ rideability and engine traits stay as shut as attainable to their well-established carbureted engines, whereas eliminating the disadvantages of the carb engines (the necessity to pre-mix the gasoline with oil, the necessity to re-jet to go well with completely different altitude and humidity, and many others).

ARE THE SERVICE INTERVALS ANY DIFFERENT? No, KTM tells us that really useful service intervals for the TPI and carbureted fashions are the identical or very related

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WHAT ABOUT THE OVERALL RISK OF FAILURE? WITH THIS TPI SYSTEM, SURELY PROBLEMS ARE MORE LIKELY. KTM acknowledges that the system is extra advanced and includes extra elements (there’s a gasoline pump, oil pump, injectors and sensors that aren’t required on carburetted fashions). However additionally they make the purpose they’ve examined the system extensively and located no points, and that most of the new {hardware} elements are the identical or related to people who have confirmed their reliability on their four-stroke fashions.

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CAN THE BIKE BE RE-MAPPED TO ADJUST THE POWER? AND WHAT ABOUT TRACTION CONTROL? There may be another (softer, traction) map already programmed into the bike, which will be activated by disconnecting the mapping cable behind the headlight (a map selector swap solely comes as commonplace on the Six Days fashions, or will be bought from KTM’s PowerParts vary for traditional fashions). As with KTM’s four-strokes, it isn’t attainable to create {custom} maps for the 2018 two-strokes. And regardless of many individuals pondering that the extra refined EMS required for these injected two-strokes would additionally pave the way in which for traction management, KTM’s design crew says traction management for his or her two-stroke fashions is at the least three years off.

WHAT IS THE DIFFERENCE IN FEELING BETWEEN THE TPI AND THE CARBURETED MODELS WHEN RIDING? It is vitally troublesome to inform the distinction. The TPI bikes merely really feel like a wonderfully set-up carbureted bike, it doesn’t matter what the change in altitude. The 2018 TPI fashions begin simpler, idle extra easily, and barely emit any smoke or pungent two-stroke odor. Their total energy character doesn’t really feel a lot completely different from the predecessors’, although the TPI bikes’ engines are noticeably smoother and extra conscious of throttle inputs, and so they chug up hills at super-low revs with out the help of the clutch. Collectively, this provides them a extremely torquey, tractable really feel. That stated, the 250 engine doesn’t really feel fairly as energetic as its carb-fed predecessor at excessive revs.

WHICH MODELS GET TPI? At this stage, solely the 250 and 300EXC enduro fashions (and the up-specced Six Day machines primarily based off them) get the brand new TPI fuel-injection system.

IS THE CARBURETED MODEL STILL BEING MADE? For some markets and in restricted portions, sure.

WILL KTM’S 250SX MODEL BE FUEL-INJECTED IN THE FUTURE? The impetus for the transfer to an EFI system for KTM’s two-strokes was the Euro 4 emission laws, which come into impact for 2017. However as a result of Euro 4 applies solely to road-going or registered automobiles, KTM has solely fitted the TPI gasoline injection system to its enduro bikes. Their SX fashions will stay carb-fed (in the interim, anyway).

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CAN WE EXPECT TO SEE FUEL-INJECTED TWO-STROKE STREET BIKES FROM KTM IN THE FUTURE? Not within the rapid future. The engines developed are particularly designed for off-road use. Avenue bike engines are a very completely different situation.

WILL THE TPI MACHINES BE HOMOLOGATED FOR ROAD REGISTRATION, AND DO THEY ADHERE TO EURO 4 REGULATIONS? Sure, the TPI fashions fulfil the present Euro 4 laws and will be absolutely highway registered (in Europe, USA, Asia and Australia).


WHAT ARE THE COSTS OF TPI – IN TERMS OF PRICE AND WEIGHT? Eliminating the carb saves some weight, however by the point to TPI bikes are fitted with the brand new oil tank, gasoline pump and related sensors and electrical system mods, there’s a web enhance in weight of two.5-3kg. Additionally, KTM’s monumental funding into this know-how will in the end be paid for by the patron. KTM Australia’s Jeff Leisk says he expects the 2018-model 250 and 300EXC TPI bikes (which arrive in Australia in early 2018) will retail for roughly $1000 greater than their carb-fed equivalents (which is able to begin arriving in Australia in July). In Europe, the TPI bikes are 450 to 500 Euros dearer than their carb-fed predecessors. This equates to AUD $650-$750). In accordance with KTM, “This isn’t a dramatic enhance, contemplating the know-how.”

HOW BIG IS THE FUEL SAVING ON THE TPI MODELS? Relying on the driving fashion and terrain, the TPI fashions are claimed to make use of between 30 and 40% much less gasoline.

WHAT IS THE FUEL-TO-OIL RATIO ON THE TPI MODELS? The oil is provided by the oil pump, which regulates the quantity in response to the load and RPM. On common, that’s finished at a ratio of 80:1 – that’s, 1 litre of oil per 80 litres of gasoline. On carbureted fashions, that ratio was 60:1. Plus the carb bikes require a pre-mix answer.

WHAT IS THE OIL CAPACITY OF THE TPI MODELS? It’s 700ml, which is claimed to be sufficient for at the least 5 gasoline tank refills.

DO THE TPI MODELS REQUIRE A SPECIAL KIND OF OIL? No. The blokes from Motorex had been on the launch and defined that they had been ready to custom-develop a selected oil for the TPI machines. However each KTM and Motorex now advocate the TPI bikes use the identical Motorex oil (Cross Energy 2T) as you probably did to pre-mix your gasoline with the carbureted two-strokes.

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CAN THE TPI MODELS BE RUN WITH PRE-MIXED FUEL INSTEAD OF A SEPARATE OIL SUPPLY? No! In case you do this, the crankshaft bearings wouldn’t get adequate lubrication.

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IS THERE LESS SMOKE COMPARED TO PRE-MIXED FUEL? Apart from lowered gasoline consumption, the TPI fashions are claimed to emit as much as 50% much less smoke, due to the separate oil provide. In our expertise, that’s a conservative estimate.

WHAT IS THE FUEL CAPACITY OF THE TPI MODELS? The capability is barely lowered (to 9 litres) because of the new gasoline pump contained in the tank, however the gasoline vary is way larger because of the decrease consumption (it’s now claimed to be a lot nearer to the four-strokes’).

WHEN WILL THE FACTORY TEAM RACE WITH THE TPI MODELS? KTM says their manufacturing facility racing groups will compete with the TPI fashions from the launch onwards. However we did discover that only a few manufacturing facility riders had been utilizing the TPI bikes ultimately weekend’s 2017 ErzbergRodeo.

WHO WAS INVOLVED IN THE DEVELOPMENT OF THE TPI MODELS? KTM’s principal check riders had been Lars Enöckl and Andreas Lettenbichler. The TPI machines’ first main (public) check was on the Roof of Africa race in 2016 – probably the most difficult races by way of warmth and altitude modifications.

WILL THE KTM 125XC-W AND KTM 150XC-W TWO-STROKES BECOME TPI MODELS IN THE FUTURE? There are different fashions deliberate, however KTM is but to substantiate which fashions will obtain TPI and when.

WHAT WILL THE COST DIFFERENCE BE ROUGHLY BETWEEN THE TPI MODELS AND THE CARBURETTED MODELS? Primarily based on retail costs in Germany, the distinction is round 450-500 Euros. In Australia, the 2018-model 250 and 300EXC TPI bikes are anticipated to retail for roughly $1000 greater than their carb-fed equivalents.

WHEN WILL THE TPI MACHINES BE AVAILABLE? TPI fashions will start to reach in European sellers in July, however not till early 2018 in Australia. Their carb-fed, 2018-model equivalents will begin arriving in Australia in July.

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