Where to Find It and What You're Actually Looking At
The guide you want is a community-maintained document that covers the common failure points on the KTM 990 SMT, which is basically the street-touring version of the 990 platform. I've seen it pop up on a few different forums over the years. The most complete version tends to circulate on the KTM forums and on some German bike boards. You'll usually find it as a downloadable PDF or a long forum thread with attachments. I can't give you a live link since these things move around, but a search for "KTM 990 SMT troubleshooting PDF" or the thread title should surface it within the first few results. This is the main title you'll see when you actually land on it. The guide itself is pretty unglamorous. It's not one of those beautifully typeset manuals from the dealer. It reads like someone who spent weekends under their bike took notes and compiled them. That's actually its strength. The content is practical rather than polished. The sections that matter most are the ones dealing with ignition coils, the crank position sensor, and the fuel pump relay. Those three components account for roughly 80 percent of no-start situations on these bikes. The guide walks through diagnosis in a specific order. It doesn't just list symptoms and say "check the part." It gives you test procedures with actual values.
For the ignition coils, it specifies resistance measurements. Primary side should read around 0.5 ohms. Secondary side runs closer to 5000 to 7000 ohms depending on the coil. Anything outside that range and you replace it. The crank position sensor section covers the gap setting, which is measured in millimeters. The specified gap is 0.3 to 0.5 mm. I've seen too many people miss this and just slap the sensor back without checking clearance. That's how you end up with intermittent stalling at speed.
My Experience With This Bike and the Guide
I had a 2007 990 SMT that would die at highway speeds. Not fade out, just cut completely. Battery voltage was solid, fuses were fine, and the fuel pump was priming normally. I followed the guide's troubleshooting tree down to the wiring harness section. It mentioned checking the connector at the left side of the frame, near the subframe mount. That connector had corroded pins from years of rain exposure. The guide told me to clean them with contacts spray and apply dielectric grease. I did both. The problem went away after that. It had been happening for about six months before I found the guide. That's six months of towing and frustration. The guide also covers the IMMO system quirks. The immobilizer on the 990 platform is known to cause issues when the key fob battery gets weak. It doesn't always throw a warning light. Sometimes it just kills the fuel pump relay circuit intermittently. I learned that the hard way. The guide recommends testing with a spare key before jumping into expensive diagnostics.
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What the Guide Gets Wrong or Leaves Out
Here's the thing nobody tells you. The guide assumes you have a multimeter and maybe a basic test light. It doesn't cover OBD2 scan tool readings in detail. The 990 uses a proprietary connector, not standard OBDII. You need an adapter cable to hook up a normal scan tool, and even then, the factory-level diagnostics are limited. The guide mentions error codes but doesn't explain how to pull them without special equipment. If you don't have the KTMDiag or a compatible interface, you're working blind for some issues. Another gap is the throttle body synchronization. The SMT uses ride-by-wire throttles, and the guide barely touches on adaptation procedures. If your bike is running rough at idle or has a flat spot on throttle roll-on, cleaning the throttle bodies is only half the battle. You need to run the adaptation routine through the diagnostic interface. The guide doesn't walk through that. I ended up figuring it out from a YouTube video after the guide ran out of suggestions.
Practical Workarounds and Things They Don't Tell You
The fuel pump relay on these bikes is a known failure point. The relay itself is a standard Bosch part, number 0 332 019 020, but KTM branded it. You can buy the Bosch equivalent for a fraction of the price. The guide mentions the relay but doesn't flag that the relay socket on the fuse board also cracks over time. I found a hairline fracture in the socket housing on my bike. Heat cycling from years of engine operation caused it. I ended up repairing the socket with a needle and solder rather than replacing the entire fuse board. That saved me about two hundred dollars in parts. For the crank sensor, the guide gives the gap spec but doesn't mention that the sensor mounting surface on the engine case can accumulate metal debris from clutch wear. Over time, that debris affects the magnetic field and throws off the reading. I cleaned the mating surface with a lint-free cloth and isopropyl alcohol during my last service. No problems since. Something as simple as that could be the difference between a bike that runs well and one that stalls randomly.
Download and Access Notes
The guide exists in a few places. The original thread on the ktmclub.net forum has the full PDF attached. There's also a mirrored copy on slideplayer.com and a condensed text version on reddit's r/KTM communities. I'd recommend grabbing the PDF from the forum thread since it has the most complete diagram set. The formatting is okay. Some of the images are low resolution but legible. The text version on Reddit is useful if you just want quick reference without downloading anything. One thing to be aware of. Some of the links circulate on file-sharing sites that bundle adware. Stick to the forum threads and GitHub repositories. Avoid random PDF download sites that pop up in search results. The guide itself is free. No one is charging for it, and you shouldn't pay for it either.
Who Should Use This Guide
If you're doing basic maintenance on your 990 SMT and want to understand what's going wrong before taking it to a shop, this guide is worth your time. It's not a substitute for a factory service manual if you're rebuilding the engine or doing major work. The factory manual has torques, sequences, and specifications that this guide doesn't cover. But for electrical gremlins, fuel system issues, and ignition problems, the guide is accurate and save you from swapping parts randomly. I've used it on three different 990 bikes now and it's held up. The information is still relevant even though the bikes are aging out of production. The real value is in the systematic approach. Most owners start by replacing the spark plugs and hoping for the best. The guide forces you to check the easy things first, in order, with measurements instead of guesses. That alone will prevent you from buying parts you don't need.
