THE ULTIMATE BIKE BUILD
2024-25 KTM / HUSKY / GAS GAS 350 / 500 / 501 EXCF-XFW-FE-FE-S
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Before getting started, let's clear one thing up right now. YES we can remap your STOCK ecu. We can remap / reprogram A LOT of stock KTM / HUSKY and GAS GAS ecu's. Nothing in this world is locked if you have the right tools and the combination to get in there.
Only a few of us can do this. The rest of the world tries to convince you that you need to buy some super high dollar ECU for these things. Just keep in mind that, that's all they have to sell you, since they can't do the more effective ECU reprogramming we have.
It's going to cost you around $1000, so they can make their $150 profit, on an ecu that performs, and is less durable, than our reprogramming.
We could sell those things just as easy. But we don't because we have no interest in knowing we've ripped someone off, for three times the money, for less performance.
Our stock reprogrammed ECUs, can be used with the 2024 KTM SXF model map switch. This gives you 4 maps, traction control and the option to use the Quick Shift feature.
This will be further discussed later, but it gives us the ability to easily fix all of the bikes running problems.
Now let's move on!
If you do anything to this bike. Anything at all. Get the handlebar vibration dampers here. They make riding the bike ohhhh, so much nicer. Getting rid of the majority of the vibration and shocks, that get to your hands, really helps you enjoy the bike.
These do NOT FIT the KTM 6 days models or any HUSKY bikes. They have differnet kinds of clamps.
In stock form, the handlebar clamp bolts to the top triple clamp, with just a metal to metal mount. You can see this in the image gallery. The left hand side is just a bolt going through a hole. On the right side though, you can see our pink bumper installed.
One of the next things, you may want to do to this bike, is get rid of the the thermostat. You can see in the image gallery, the stock thermostat coolant tube on the left, and the straight through non-thermostat coolant tube on the right.
The stock exhaust end cap on this bike is very restrictive. If you take all the pressure that comes out of a large 500 cc piston, and don't let it out of the exhaust pipe, heat quickly builds up.
If you want to ride the bike around in stock form, it will still flame out and stall, but this non-thermostat coolant tube will help lower the engine temp 10 degrees or so.
Also if the bike is modified, you would want to do this in temps over 80 degrees. Especially if you will be riding in singletrack and have no air flow through the radiators. The fan will be on a lot and this wil help.
The biggest complaints on these bikes, are the compliants we specialize in fixing.
Complaint #1
The bike feels choked up
Answer
It is. We can get rid of that and make it as fast as anything out there, for less than $600, with our basic power bundle. In fact, not only will it make it as fast as you'd ever want, but it will fix these other complaints, at the same time.
Complaint #2
The bike stalls whenever it feels like it
Complaint #3
The bike runs hot.
Please understand that there are 3 main parts to the problems, and every one of them needs to be fixed at the same time. Just fixing one will not only not fix the problems, but may make them worse. To understand the situation better, all you need to know is, KTM did what they had to do, to sell you a street legal, and 50 state legal bike. It has to be quiet, to pass the EPA's drive by sound test and it has to put out little emissions, to satisfy california and other states emissions laws.
So... KTM decided to highly limit the air that gets into the engine, but placing a reed valve assembly from the 2 stroke engine, in the intake tract. It limits the incoming air by 25% or so, which also limits intake air noise and. power by about the same amount.
Because of the limited intake air, the exhaust can be much more restricted. This ofcourse, makes the bike quiter, but also run a lot hotter.
The lower amount of air moving through the engine, means it doesn't need near the amount of fuel, to produce it's already to lean mixture.
The regulations are then met. Lower noise and cleaner burning. Yay. And so you get all the complaints we have listed here.
On the DYNO chart here, you can see the enormous gain in power you get from our simple power bundle, for less that $600. First we let all the air in with the intake tube and out with the end cap. Then we just add the right amount of fuel and ignition timing for the increased air and hold on.
The complaints are no more.
You can choose between our standard high performance mapping, which is perfect for 0 - 7000 ft and still works ok above that, or choose the ALL ALTITUDE mapping, which gives better performance from 7-13,000 ft elevation when you use the map switch to go into the green map.
You will need to buy the map switch if you don't have one, to acces both maps, the traction control and the quick shift feature, if you choose to add. Without a switch, it will come in the full power low elevation mode.
Purchase Power Bundle with Mapping
- or -
Purchase ECU Mapping Only
It's obvious in the picture of the stock exhaust here, how restrictive the exhaust outlet is. It's restrictive on the inside of the cap as well. The only restriction in the entire exhaust system is the cap!
Our Power End Cap is available in silver or black, and can be purchased alone, or as part of our power bundle. You can see from the picture of it taken apart that there is no restriction. It finally sounds much more like a dirt bike and has a forestry approved spark arrestor.
One key thing about ours, over the others or slip on mufflers, is that ours is designed to not burn the stock turn signals. The other ones will burn them right off.
Below, we have the stock reed cage assembly being removed from the stock air boot. You can see that a big square hole left when the reeds are out. Although this will let the engine breath in all the air it needs, the large shape is not conducive to high intake air velocities at the lower throttle openings. Therefore you will suffer with bottom end response.
You can easily get it back though. All you need to do is install our intake tube, to get the intake air velocity back up to speed.
It just slides in place and gets the intake tract, back to the shape of every high performance intake known to man. Which is a hole about the size of the throat of the throttle body.
Just like the air boot you see from the race bikes shown here. A fast moving intake air velocity really helps improve bottom end throttle response. It's a very important fix and part of the power improvement puzzle
Now that we have managed to get about 25% more air into and out of the engine, we just need to add fuel and ignition timing to compensate for that.
That's where the ECU reprogramming comes in. Located right under your seat, you just unclip it from the wiring harness and send it in for fixing.
If you don't want to wait for mapping to be performed on your stock ECU, or simply want to keep a stock ECU on hand, well then many times we have pre-mapped ECU cores ready to ship. You can always send your stock ECU back to us within 30 days of your purchase for a $300 credit back.
The 2024 and 2025 bike mappings all come with 4 maps in the ECU after we get done with it. We can even enable the quick shift feature if you want. The 2 power maps, the traction control feature, and the quick shift feature, are all available to you with this one handlebar mounted map switch.
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