TPI Fuel Injector Relocation Block | How it Works
For 2020 - 2022 KTM, Husqvarna & Gas Gas Bikes
To the right, you see a pic of a factory KTM throttle body for 2023. It's a bike that was being taken apart at the 2021 Tennessee knock out race.
It's a nice thing to see, because the mechanic working on the bike, confirmed to someone I know, that they re tired of the bikes destroying top ends, and lawsuits, so they moved the injectors to in front of the reeds.
SO.... If you think that our idea of relocating the injectors doesn't have Merritt......... Well, you may be one of the few. Save your money though for rebuilds though, while being cynical. You'll need it.
Even KTM recognizes that
What to expect form using the SURESHOT fuel injection relocation block.
Lubrication as soon as the bike starts. So no running on just fuel for a few seconds.
Save who knows how much money and time lost, due to having replace top ends and cranks
The bike will idle smoother and higher if desired. No more super low idle. The idle speed actually responds now, when you adjust the idle screw
Response is much more instant, as the bike won't start to run itself lean, after idling for a few seconds.
The bike will pull harder off idle and through the midrange. The air / fuel numbers are instantly better and a more consistent 13:1 area, than the stock set up.
Fuel mileage will go up, as the mid range isn't so rich running.
As the dyno chart shows, the top end goes up as well. The blue line of 55.7 hp, is the relocation block only, over the 55.0 hp of the BestDualSportBikes TPI spark arrestor addition. The 53.3 hp was a stock bike without relocation block.
Using the relocation block doesn't require re-mapping or fuel adjustments. It works great with the stock 2020-2021 ECU, or the aftermarket GET ecu. And this relocation block, is a much cleaner setup, that the GET relocation block
HOW IT WORKS
The understanding of the fuel injector relocation plate, for 2020 - 21 KTM, Husqvarna and GAS GAS TPI bikes, is easy. It's exactly what it says it is, and does. It's a plate that lets you relocate the fuel injectors from the cylinder transfer ports, to between the throttle body and the reed cage.
Relocating the injectors, next to the oil injector feed line, which you can see entering into the throttle body, is so, so important, because it keeps the air, fuel and oil, all entering the crankcase and cylinder as one working unit, instead of the oil and fuel entering in different locations.
You can see in the two pictures of the cylinder what happens when the bike is stock, and the oil ( the lubrication ) and the fuel ( injector ) location, are separated by a few inches. The bike only needs fuel and air to run, so it starts running on just fuel and air.
Only fuel is entering the cylinder when the bike starts running. It takes awhile for the oil ( the source of lubrication for the crankshaft and piston and cylinder ) to get past the reed valves insides ( as it keeps closing as much as it opening ) and into the bottom end of the engine.
And then, once in the bottom end of the engine, it has to get through the transfer ports and into the top end of the cylinder, so it can lubricate the cylinder walls. And that's why, these two pictures look the way they do, because the the top end of the cylinder was runiing with no lubrication for the 30 seconds that the bike was started at the dealership
So this cylinder and it's dry scrape markings that you see, are from a 2020 TE 300 i bike, that was started at the dealer to prove that it ran. It ran for 30 seconds and then shut off. It was then torn down. These are the result. The scrape marks are absolute proof, that these bikes run on just air and fuel, and zero lubrication, until the oil finally works it's way in there.
This is why so many of these TPI bikes wear out in 30-60 hours and need new top ends, when their carburated counterparts go 200 or so hours with no problems.
Now it's easy for you to comprehend why moving the fuel injectors right next to the oil injection port, BEFORE the reed assembly, is SO,SO,SO IMPORTANT. Because the fuel and the oil and the air, can all mix together before it enters into the motor.
So now when the fuel and the air hit the spark plug and the engine fires up, the oil is part of the mix. That means lubriction is right there from the start. Just like a carburated bike.
This now, finally has all the positives you thought you were getting when you got a TPI bike.
1. Now it actually has no weak links and doesn't have pre mature wear problems.
2. It runs much better, with the injectors relocated, so it finally has the snap and power or a carb bike
3. You get to enjoy the better mileage and adjustement to temp and elevation you expect, from a TPI bike
4. You can actually take it on a long ride and just fill up at gas stations, knowing that the bike isn't wearing out and struggling for lubrication as you ride it. Nothing worse than worry in the back of your mind as you ride. (Will I have to walk home?)
A few other great things about this relocation block, that you may not realize are:
1. The fuel line routing is super clean and fits great with the tank line. It's not a mess of lines, like it is with the ATHENA GET TPI relocation block. That thing is a night mare. This block even makes the GET set up work better if you replace their block with this one.
2. If the oil is just entering the reeds and cylinder by itself, as in a stock set up, then the oil is very sticky. This means it even has a harder time getting past the reeds and surfaces of the bottom end and through the transfer ports. It does not flow freely to all the surfaces it needs to lube.
3. With the injectors and oil right next to each other, the fuel can dilute the oil, making it far less viscous and thus, move freer and easier. This of course, gets it quicker to all the areas it needs to protect.