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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…
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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…
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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;…
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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…
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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…
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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…
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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…
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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…
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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…
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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…
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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…
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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…
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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…
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