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FAT TIRES: MR. KNOW-IT-ALL

DEs’ SETTINGS Dear Mr. Know-It-All, I’m setting my 2014 300 up for desert racing and have a question about tires. To help in the high-speed sand washes, I’m thinking about switching to a Fatty front tire with a mousse. Is one brand better…
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DR350 REPLACEMENT: MR. KNOW-IT-ALL

RANDOMLY BIZARRE Dear Mr. Know-It-All, Now I am ready for an all-new motorcycle. One I can buy and not fix it. I just want to ride it tuned to me—sag, tire pressure, fork oil, seat grip and handlebars, actual pull on the pipe and off,…
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REMEMBER THE RMX! MR. KNOW-IT-ALL

YELLOW BOOST Dear Mr. Know-It-All, Hi, I’m looking to get some updates on the latest way to uncork the 2019 RMX450Z off-road bike. What is the latest way, parts, mods, to unleash the beast? You guys ran some tests and mods back in the…
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BRAKE HEAT MYSTERY: MR. KNOW-IT-ALL

BRAKE TIME Dear Mr. Know-It-All, Should I beg for you to impart some of your great dirt bike knowledge? The way readers had to beg for a response from Rondo Talbot in the mid-’70s? I have a Husky, a KTM, and a new GasGas. When braking, I…
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DIRTY DEEDS: MR. KNOW-IT-ALL

DIRTY DEEDS DONE DIRT DEEP Dear Mr. Know-It-All, I just bought a 2021 KTM 300XC-W and rode it stock on day one. I thought the Xplor suspension was surprisingly good. The next day I swapped the OEM tires and tubes (Dunlop Geomax AT-81) for…
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KTM HEAD INSTALL: MR. KNOW-IT-ALL

MY HEAD HURTS Dear Mr. Know-It-All, I just purchased an S3 head for my 2020 KTM 300XC and have a problem. I opened the kit, and I see the included head O-rings and crush washers, but I have one extra O-ring; it’s a smaller size. Where on…
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TRIAL BY AIRBOX: MR. KNOW-IT-ALL

BOXING WITH AIR Dear Mr. Know-It-All, Can I delete the airbox on my old Aprilia (Rotax 277cc) two-stroke (trials bike) and just install a clamp-on K&N air filter to the back end of the carb? Some people say the box is there and can’t…
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READ YOUR REEDS: MR. KNOW-IT-ALL

Dear Mr. Know-It-All, My new-to-me 2007 RM250 won’t run properly. It runs super rich and stalls on every downhill. I can’t keep the thing running for the life of me. It has fresh fuel and a clean, well-jetted carb. It is a new issue that…
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BEAN OIL BLUES: MR. KNOW-IT-ALL

STUCK IN THE MIDDLE Dear Mr. Know-It-All, My exhaust valve in my 2017 300XC was absolutely stuck shut. Lacking snarl was an understatement. I was using Maxima Castor 927, partially because I liked the smell. You can’t use that oil. Darn…
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GAS DRAIN STRATEGY: MR. KNOW-IT-ALL

DRAINED Dear Mr. Know-It-All, I have a 2004 YZ250 two-smoker that is set up for off-road. I am unable to access my carburetor drain bolt to drain my gas out of the carb at the end of the ride. As you know, the quality of gas we now have…
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2004 SUZUKI RM250 PROJECT: BEHIND THE BUILD

The late ’90s to mid-2000s Suzuki RM250 two-strokes might just be the best used motorcycles out there. They feature a strong engine and a great handling package that makes the bikes fun to ride. This is probably why we don’t come across…
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HOT BRAKES: MR. KNOW-IT-ALL

Dear Mr. Know-It-All, At one point in time, I got myself some brake pads that had an extra piece that I assumed was some sort of thick heat-reducing pad. It went between the pad and piston. This was several years ago, and I have continued…
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KLX300 CARB CLEAN: MR. KNOW-IT-ALL

Dear Mr. Know-It-All, My 2005 KLX300 has been running horribly, and I have nowhere else to turn. I figured the carb was just dirty and have cleaned it spotless. But, even still, the bike’s idle is inconsistent, and when you get on the gas…
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POWERVALVE MESS: MR. KNOW-IT-ALL

Dear Mr. Know-It-All, My 2020 KTM 300XC has been making a horrible mess right around the power-valve cover. I’m not sure what kind of oil it is, but I’d expect that a new bike shouldn’t be leaking this bad. Please advise. Hoyt Oswald Via…
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TRAIL CLOSED: MR KNOW IT ALL

CLOSED UP TIGHTER THAN A… Dear Mr. Know-It-All, I’m sick and tired of trail closures. Every time my buddies and I go to our local zones, there are always more trails fenced and closed each time. We ride respectfully, and most riders in…
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RACE SAG SET UP: MR KNOW-IT-ALL

SAGGY Dear Mr. Know-It-All, Recommendations on rider shock sag are specified to the millimeter, yet my rider shock sag varies 5mm or more depending upon where I sit. Is shock sag measured when all the way up on the tank for cornering or…
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MY 300 LACKS SNARL: MR-KNOW-IT-ALL

300 LACKS SNARL Dear Mr. Know-It-All, I purchased a 2020 KTM 300 XC TPI, and while I love the machine, it feels a bit docile when trying to get up on the pipe and revving the bike out. The bike has plenty of power, but lacks that snap and…
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PRODUCT TEST: XTRIG PRELOAD ADJUSTER

PRODUCT: Engineered in Germany, the Xtrig preload adjuster is a mechanical replacement for the two rings used to make sag adjustments on your rear shock. The ingenious design uses a worm gear that travels the full length of the shock body…
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MR. KNOW-IT-ALL: FUEL QUERY

FUEL QUERY Dear Mr. Know-It-All, I can’t remember a time before your column was in Dirt Bike, and I have been a reader since before Super Hunky left, yet I have never before asked a question. What is the order of preference concerning…
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