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KTM fuel injected 2-strokes due in May

  1. #26
    Rookie Rada's Avatar
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    Re: KTM fuel injected 2-strokes due in May


    This will make cold weather riding much nicer. Injected sleds are so sweet. They start instantly.
    Another plus side affect is that generally speaking FI is much more tolerant of the dog piss they call gasoline these days.

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  2. #27
    Backwoods lobster boy number9's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    I would imagine a lot of it is simply pressure (pun not intended but totally intended) to meet emissions standards, even if a lot of the bikes won't ultimately be road-registered.

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  3. #28
    Lifer
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    Re: KTM fuel injected 2-strokes due in May

    My own personal question has become: Should I buy the last carbureted version, or the first gen FI version?
    If I envision an apocalyptic scenario, the carb is the way to go. But how realistic is that, really? FI has many benefits, including extended range, and ease of tuning (no more yanking the carb to re-jet!).


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  4. #29
    Soul Rider Paul_E_D's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    I would go FI, but wait a year.

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  5. #30
    Lifer
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    Re: KTM fuel injected 2-strokes due in May

    Thanks, Paul. That sounds like a wise position to take.


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  6. #31
    Lifer typeone's Avatar
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    Re: KTM fuel injected 2-strokes due in May


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  7. #32
    Lifer Imbeek's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    there you go...almost nothing good about it from the riders perspective, but fantastic for European tree huggers

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  8. #33
    Your Father csmutty's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Quote Originally Posted by Imbeek View Post
    there you go...almost nothing good about it from the riders perspective, but fantastic for European tree huggers
    God you're old.

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  9. #34
    Posting Freak jimmycapp's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Quote Originally Posted by Rada View Post
    This will make cold weather riding much nicer. Injected sleds are so sweet. They start instantly.
    Another plus side affect is that generally speaking FI is much more tolerant of the dog piss they call gasoline these days.
    Yea. Winter and early season riding will be great. Sucks heading out early on a spring morning on summer jetting, when it's running a little lean.

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  10. #35
    Don't bother me! R7's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Knowone liked the idea with efi thumpers a few years ago, but it has been proven that efi is far better than a carb. Love the adjustability of my 450R by simply pushing a few buttons, settings adjusted in seconds rather than an hour to swap jets and needles. Efi also ends most of the nightmares with ethanol.

    I'm confident the efi 2 smokes will be equally reliable and out perform the older carb models.

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  11. #36
    Lifer Kurlon's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Clarification, EFI may be better than what most people think of as a carb, but it hasn't been proven universally better than ALL carb tech.

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  12. #37
    Lifer typeone's Avatar
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    Re: KTM fuel injected 2-strokes due in May



    The wait is over as KTM officially release their 2018 fuel injected two-stroke EXC TPI enduro bikes to the world’s media in Austria.

    Hitting the headlines for model year 2018, KTM’s 250cc and 300cc 2-stroke enduro bikes feature an all-new engine management system with revolutionary TPI fuel injection — the world‘s first serial electronic fuel injection system for 2-stroke offroad racers.

    The TPI technology — transfer port injection — has been developed by KTM in close co-operation with EFI specialist Synerject. Turning the 2-stroke world upside down, it makes engine operation not only remarkably cleaner, but also provides a more consistent performance.

    While engine power remains at the same level, the power delivery is much more homogeneous. Compensating automatically for air pressure and temperature, there is no need to set the TPI bike up for the elevation and weather of the race location. Premix fuel with 2-stroke oil is also a thing of the past, and the fuel efficiency increases dramatically.

    Benefits in brief

    • Reduced fuel consumption.
    • Automatic elevation compensation, no re-jetting required.
    • Enhanced rideability and performance.
    • Reduced emissions.
    • Smooth engine behaviour.
    • Reduced fuel evaporation, which also means less fuel smell in transport vehicles.
    • Enhanced comfort and convenience: easy starting, no pre-mixed fuel.
    • No flooding when flipping over the bike.




    While KTM introduced their new EXC generation in 2017, they go one step further in 2018 with the introduction of fuel injected technology in their 250 EXC and 300 EXC two strokes.

    Set to be a game changer, the TPI models are the world’s first 2-stroke, offroad competition bikes with serial, electronic fuel injection.

    “TPI” stands for “transfer port injection”, and the groundbreaking new two-stroke represents another major step forward on a global scale.

    KTM say the benefits to owners are huge improvements in fuel efficiency and clean exhaust emissions, while the electronics do away with the need for re-jetting, no matter the elevation of the race venue and prevailing weather conditions.

    Also, engine lubrication on the TPI models is automatic from a separate oil tank and electronically controlled oil pump, negating the use of the traditional two-stroke pre-mixed fuel-oil mixture.

    In addition, the TPI bikes benefit from the complete set of KTM Enduro racing features such as an E-starter powered by super-lightweight lithium ion batteries, Brembo brakes, self-adjusting hydraulic clutches, KTM ‘No Dirt’ footpegs and gear shift levers, KTM tool-less air filter boxes, quick- release fuel lines, polished hubs, WP Xplor 48 split forks, WP Xplor PDS shock absorbers and of course typical KTM precision-welded chromoly frames.



    Transfer Port Injection — how it works

    TPI — transfer port injection — is a global-first, groundbreaking technology for 2-stroke racing engines that delivers a previously unattainable combination of top performance and outstanding rideability.

    Lubrication is taken care of by an automatic system with a separate oil tank and electronically controlled oil pump instead of using premix.


    THROTTLE BODY

    The TPI engines are fitted with a newly developed 39 mm throttle body made by Dell’Orto. Power is controlled by a throttle valve and two throttle cables via a newly developed handlebar throttle assembly group.

    Intake air data is provided to the engine management system by a throttle position sensor, while an adjusting screw allows the idle speed to be set. A cold start device is also provided, opening a bypass to supply extra air.

    Oil supplied by the automatic oil pump via an oil suction pipe is mixed with the incoming air to lubricate the moving engine parts.



    OIL PUMP

    An oil pump mounted underneath the oil tank delivers the lubricant to the throttle body, where minute quantities are mixed with the incoming air in order to lubricate the moving engine parts.

    Using engine speed and throttle position sensor data, the engine management system’s precise electronic control of the oil pump ensures the perfect amount of oil for any given conditions, loads and engine speeds is added.

    The filler cap assembly for the oil tank is located between the fuel tank and steering head, utilising a hose in the upper frame tube to conduct the oil to the storage container. Automatic, electronically controlled oil injection reduces exhaust smoke by up to 50% over conventional pre-mix lubrication, with an average fuel-to-oil ratio of 1:80. This means the oil capacity of about 0.7 litres is sufficient for at least five tanks of fuel.


    CYLINDER

    The core dimensions and layout of the TPI cylinders are carried over from the carburetor model with bore diameters of 66.4 and 72.0 mm, respectively. However, the new cylinders feature two lateral domes holding the fuel injectors that inject fuel into the rear transfer ports.

    This downstream injection atomises the fuel with the upstreaming air for a highly efficient combustion and significantly reduces the loss of unburned fuel.

    The engine management system’s intake pressure sensor is connected via a small-diameter tube in the back of the cylinder. For a smooth and well-controlled power delivery, the exhaust control of the carbureted EXC models is also retained.



    ENGINE MANAGEMENT SYSTEM

    Based on a newly developed electronic control unit located below the seat, the new KTM EXC TPI models feature the most modern engine management system (EMS) of any 2-stroke offroad motorcycle.

    Utilising various sensor data such as intake and ambient air pressure, throttle valve position and water temperature, the control unit optimises ignition timing and the amount of fuel to inject. Automatic altitude and temperature compensation, eliminates the need for the rider or mechanic to set up the bike for the prevailing environmental conditions.

    An accessory radiator fan from the KTM PowerParts program will be controlled directly by the EMS without the need for an aditional temperature switch. An optional map select switch (standard on the SIX DAYS models) allows the rider to select an alternate map, providing a smoother power delivery.


    Additional updates to the 2018 EXC TPI two strokes



    GENERATOR

    In order to accommodate the power requirements of the upgraded engine management system, the TPI models are fitted with a more powerful generator, rated at 196W, just like on the EXC-F 4-stroke models, as well as the EXC-F voltage regulator.


    BALANCER SHAFT

    For optimal mass centralisation, the lightweight, die-cast crankcases hold the clutch shaft and the crankshaft in a high position close to the centre of gravity supporting the handling of the bike.

    In addition, this design allows the implementation of a lateral balancer shaft to minimise vibrations, enhancing comfort and reducing rider fatigue during long and demanding enduro events and rallies.

    CLUTCH

    The KTM EXC TPI models use the KTM-developed DDS clutch (damped diaphragm steel) with a highly resilient steel basket and extremely heat resistant clutch plates, a design distinguished by a considerably easier clutch operation than with conventional coil springs.

    The diaphragm spring also leaves sufficient space for a damping system integrated into the clutch hub, which benefits both traction and durability.

    The hydraulic Brembo clutch mechanism is synonymous with a light action and highly controlled clutch modulation.

    TRANSMISSION

    The 6-speed transmission features widely spaced gear ratios optimised for enduro. The KTM ‘No Dirt’ gear shift lever design prevents residue from blocking the joint of the gear shift lever for safe and reliable shifting in any conditions.

    E-STARTER & BATTERY

    The EXC TPI models are equipped with E-starters located in a well-protected position on the undersides of the engines. A powerful but lightweight lithium ion battery provides convenient and reliable starting.



    SUBFRAME

    The rear subframe made of lightweight aluminium sections is connected to the frame with four bolts and weighs 900g.

    FRAME

    The frames of all KTM offroad models are manufactured from lightweight sections of top-quality chrome-molybdenum steel tubing of various cross sections. This type of frame design provides high torsional rigidity for best handling and rideability, while a certain longitudinal flexibility can absorb the wheel impact energy, supporting the suspension for reduced rider fatigue.

    At the same time, the frame triangle serves to deliver the coolant from the cylinder head directly to the radiators.

    In the TPI models, the modified frame design also serves to route engine oil from an added filler cap assembly, located between the fuel tank and the steering head, via a hose inside the upper frame tube to the oil tank.



    FUEL TANK & FUEL PUMP

    Along with the new injection system, the TPI models receive a new, 9L tank with an integrated fuel pump system like the 4-stroke bikes and an additional fuel level sensor. All KTM EXC models feature lightweight, translucent polyethylene fuel tanks that make it easy to gauge the fuel level from the outside.

    AIR FILTER BOX & AIR FILTER

    The air filter box design offers maximum protection of the air filter against soiling while ensuring maximum air flow. It uses a large Twin Air filter element mounted on a rigid cage which at the same time forms the air filter box bracket. The straightforward design also minimises the risk of installing the air filter or cage incorrectly.

    In addition, the new TPI 2-stroke models are fitted with a new velocity stack to match the throttle body while at the same time accommodating an intake air temperature sensor.

    EURO 4

    The European stage 4 emission standards for motorcycles have been in effect since January 1, 2016, using the World Motorcycle Test Cycle (WMTC) and once again establishing stricter limits for motorcycle exhaust emissions.

    Thanks to the highly efficient combustion control of the TPI system and precise automatic engine lubrication, the new KTM EXC models will be Euro-4-compliant, not the least due to their significant reduction of hydrocarbon emissions.

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  13. #38
    Lifer
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    Re: KTM fuel injected 2-strokes due in May

    The video I saw recently of a cutaway 250 2T FI motor shows the oil injection tank, and single injection line.

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  14. #39
    Lifer typeone's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    it all sounds super cool but jesus is that a complicated 2-stroke dirt bike. very curious how this will work in 'racing' conditions. there is no reversal like Beta's half-step into this land although, i'm assuming the true driver here is EURO4. (which we probably discussed earlier)

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  15. #40
    Lifer Imbeek's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Can't be cheap either

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  16. #41
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    Re: KTM fuel injected 2-strokes due in May

    Word is the suspension of the '17 xcw's was a big downgrade from previous. I wonder if they are going to update that to go with the next motor.

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  17. #42
    Soul Rider Paul_E_D's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    I wonder if it weights as much as a 4 stroke now?

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  18. #43
    Super Moderator TheIglu's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Yeah, really. Gotta bump the weight up considerably.

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  19. #44
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    Re: KTM fuel injected 2-strokes due in May

    What I like about the new 2-strokes.

    Fill it with Fuel at the stops. No more pre-mix
    It will always be jetted properly ( once we find out the proper maps with the Euro4 stuff removed.)

    What I don't like is the extra 6 pounds it carries. Let's hope its down low.

    Direct Injection has been around for a while. I have an Aprilia SR50 scooter that is DI transfer port injected. The thing rips compared to anyone elses 50cc scooter. I can unlock the ECU and get more of out it. I expect the same on these bikes at some point.

    Being the first one to own this you will be the test pilot for performance mods like smog removal and stuff like that. I have a 2012 350 EXC-F Dual Purpose. That was sort of the first year for that bike. FI had some issues with fuel filters clogging and it ran really lean and needed a map update after the evap stuff was removed. There is almost 4000 miles on it. Most of that in the woods. I love it.

    Still I wouldn't mind having one of these.

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  20. #45
    Lifer
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    Re: KTM fuel injected 2-strokes due in May

    I also have a 2012 350 EXC-f. It has been completely trouble free - even the FI system. I bought a tank filter when I bought the bike, and that seems to have prevented it from having any FI issues at all. I did replace the tiny inline filters a couple of times, as purely preventive measures. I was skeptical of FI back then. Now, I am a believer.
    My 1974 Can-Am 175 TNT still has its oil injection system - and it is still working fine as well.

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  21. #46
    Lifer loudbeard's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Looking at the 300 EXC and the 350 EXC, the 300 is 103 kg and the 350 104 kg. Previous 300's weighed in at 100 kg. I highly doubt any of us mere mortals are going to notice 3 kg. I'm excited, I'll be looking for one used a year or so after they're released.

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  22. #47
    Burns retinas nhbubba's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    You mean 300 XC-W? A 300 EXC would be nifty..

    The 300 is a 2t.. not nearly the same animal as the 350.
    Better to compare 300 XC-W to (now defunct) 500 XC-W; 102.1 kg vs 111.5 kg. (2016 specs) Like a 20 lbs difference.
    Also the 2t's have a lot less rotating mass. I'm quite mere but I can tell.

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  23. #48
    Lifer loudbeard's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Quote Originally Posted by nhbubba View Post
    You mean 300 XC-W? A 300 EXC would be nifty..

    The 300 is a 2t.. not nearly the same animal as the 350.
    Better to compare 300 XC-W to (now defunct) 500 XC-W; 102.1 kg vs 111.5 kg. (2016 specs) Like a 20 lbs difference.
    Also the 2t's have a lot less rotating mass. I'm quite mere but I can tell.
    You're out of date, there is no 300 xc-w anymore* The 2t enduro bikes are exc, the 4t's are exc-f. If you must nit pick the kg's the current 2017 models, which apply here because of the frame redesign, you are looking at 103 kg for the 300 and 106.5 for the 500. That's only 7 pounds difference. Again, mortals.

    *They do still have the 125 and 150 2t's listed as xc-w

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  24. #49
    Lifer loudbeard's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    Hmm. It appears I was browsing the international KTM site regarding the model names. They've changed them over here but not over here yet.

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  25. #50
    Burns retinas nhbubba's Avatar
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    Re: KTM fuel injected 2-strokes due in May

    2017 KTM 300 XC-W

    2017 KTM 300 XC-W

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