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Maintenance

TWO-STROKE POTPOURRI: MR KNOW-IT-ALL

BAFFLED Dear Mr. Know-It-All, I have a 2002 KX250. I love the bike, but recently it has started running very rich. It’s not losing transmission oil, so I know the crank seal is okay, and I’ve played with a million needles and pilot jets and still can’t get the bike to clean up. Is there […]

THE BEST-DRESSED KNEES: MR. KNOW-IT-ALL

A FASHION RISK Dear Mr. Know-It-All, I have a fashion question for you. Do you know of a vented/warm-weather off-road pant that has a slimmer-than-normal knee area for those of us who don’t yet wear knee braces? The local shops have a limited selection of styles, and most pants are advertised as having a roomy […]

GLITTER OIL: MR. KNOW-IT-ALL

Dear Mr. Know-It-All, This past winter I tore into and rebuilt the motor on my 2002 YZ 250—new rod and main bearings and all-new bearings and seals in the transmission. Had the cylinder re-Nikasiled and added a new piston. It runs great; no noise or vibration. I noticed after servicing the transmission a second time […]

LISTEN TO YOUR TWO-STROKE: MR. KNOW-IT-ALL

RUNNING ON EMPTY—the sequel Dear Mr. Know-It-All, I have a follow-up to Ken’s two-stroke running-out-of-fuel question. Let’s say someone forgot to turn on his petcock and sputtered to a stop on the trail at low-to-moderate throttle. No harm seems to have been done; however, since his background is in four-strokes, he is curious about the […]

COOLANT QUERY: MR. KNOW-IT-ALL

SHE HAS A BLEEDER Dear Mr. Know-It-All, I recently changed the coolant on my 2001 KDX200. After pouring in the fresh coolant, I was skimming through my shop manual and realized the bike has an air bleeder on the cylinder head for the cooling system. Did I screw things up? I already started the bike […]

KTM 1290 SOLUTION & SUSPENSION THEORY: MR. KNOW-IT-ALL

A 480-POUND POGO STICK Dear Mr. Know-It-All, I bought a 2015 KTM 1290 Super Adventure new, and I love everything about it except the suspension. The rear suspension has exceptionally light damping to the point where the bike just pogos up and down 8 or 10 times after you hit a bump. And the front […]

FOUR-STROKE ENGINE REBUILD TIPS: MR. KNOW-IT-ALL

Dear Mr K I’m a two stroke guy who hasn’t owned a two-stroke in years. Somewhere I gave in to peer pressure and got a used Suzuki RM-Z250. Unfortunately, I love it. It’s unfortunate, because I have now ridden it for over 250 hours with no maintenance. Now I need to rebuild it. I could […]

KTM 250 TPI ISSUES & SOLUTIONS: MR. KNOW-IT-ALL

TELL ME WHAT TO DO! Dear Mr. Know-It-All, I have a 2020 KTM 250XC TPI. Love the handling and suspension. Only “like” the motor performance. Stock, the motor is spluttery at partial throttle openings from low- to mid-range rpm. Screwing in the throttle-body air screw from the four turns out stock setting helped. Based upon […]

MR. KNOW-IT-ALL: BETA OIL FALSE ALARM

Dear Mr. Know-It-All, Last year I purchased a 2019 Beta 300RR, and while I am loving the bike, I recently had an issue with the oil injection. The oil light on the computer continues to stay on as if the oil level is too low, even after I fill it.

MR. KNOW-IT-ALL: TRAIL RIDING DOs & DON’Ts

GLUG OR SPRAY Dear Mr. Know-It-All, With all of the air filter oils on the market, is it better to use spray-on or pour-on filter oil? Everybody says spray-on oils aren’t as potent. It seems much more efficient to spray on the filter oil than glugging it onto the foam. Bob Zarco Via mrknowitall@hi-torque.com Each […]

2-STROKE PING STOP: MR KNOW-IT-ALL

Z 250 RING-DING PINGS Dear Mr. Know-It-All, I have a 2009 YZ250 that I race on both tracks and off-road. The bike runs extremely well, but I get some detonation when I put a load on the motor for long periods of time. My jetting is on the richer side of things, and I’ve confirmed […]

ROGER DECOSTER’S 10 GOLDEN RULES OF MX

Roger DeCoster has mentored more motocross champions than any man in history. His own racing record is incredible. Beyond his five  500cc World Motocross Championships, he was a member of more winning Motocross des Nations teams than any rider, of any country. Then he led the U.S. team to a record string of des Nations […]

DECOSTER: DIAL IT IN

MAKE YOUR BIKE DO SOME OF THE WORK Today’s motorcycles are good. They have come a long way from the days when the buyer had to finish manufacturing them. Even so, the bike you buy isn’t perfect. It can’t be, because the people who made it don’t know you. They don’t know if you weigh […]

10 MAINTENANCE TIPS FOR THE KTM 300 2-STROKE: MR. KNOW-IT-ALL

The KTM 300XC-W TPI isn’t that different from a conventional two-stroke. We’ve been dealing with fuel-injection for over a decade now on four-strokes, and the rest of the bike offers no real technological differences from a bike in the late ’90s. In response to a large number of requests, here are my top 10 maintenance […]

2002 HONDA CR250R 2-STROKE PROJECT: BEHIND THE BUILD

The Honda CR250R has got to be one of the most popular early-to-mid-2000s two-stroke machines to rebuild in history. One reason is that Honda sold a ton, and the other reason is the bikes all seem to be aging very well. We found what looked like a very clean machine on the used-bike market, slapped […]

HUSKY OVERHEATING: MR. KNOW-IT-ALL

Dear Mr. Know-It-All, I have a 2017 Husqvarna FE350 that has around 1,200 miles on it. Upon the last ride, the bike started losing power and felt as if it were going to seize. This was at moderate-speed, fairly easy riding. I immediately stopped and shut the bike off. Once it cooled down, I was […]

RUNNING ON EMPTY: MR. KNOW-IT-ALL

Dear Mr. Know-It-All, I’m sure this topic has been beaten to death, but figured I’d ask anyhow. On a two-stroke bike, is there any harm, no matter how small, in allowing the carburetor to run dry? Thanks. Ken via mrknowitall@hi-torque.com I have to tell you, Ken, I nearly shot the huevos rancheros I was eating […]

BETA LEAK FIX: MR KNOW-IT-ALL

Dear Mr. Know-It-All, My thermostat is leaking on my 2019 Beta 390RRS, and the bike is out of warranty. I’m not sure if I should replace the part or buy a hose kit to eliminate it altogether. Can you feed me your thoughts on my dilemma? Ryan Sternman via mrknowitall@hi-torque.com We’ve seen these housings leak, […]