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PISTON REPLACEMENT TIME? MR. KNOW-IT-ALL

WR450F PISTON REPLACEMENT? Dear Mr. Know-It-All, I am a slightly overweight, 50-plus-year-old slow guy who has enjoyed my 2005 Yamaha WR450F since purchasing it new in 2004. I religiously service the bike myself, including regular oil and air filter changes, valve checks (they have never needed adjustment—ever) and run 100-octane fuel. The motor runs strong, […]

HOW TO READ YOUR REED: MR. KNOW-IT-ALL

STUFFED POTATO Dear Mr. Know-It-All, My 2003 KX125 has started running as if someone stuffed a giant Idaho spud down the throat of its exhaust. It’s super rich and loads up badly. It has a fresh motor all around from top to bottom. I haven’t touched the carb, as it ran great beforehand. What else […]

A MOUSSE FOR DUAL-SPORT? MR. KNOW-IT-ALL

MOUSSE CALL Dear Mr. Know-It-All, Is it safe to run a NitroMousse on a dual-sport that spends limited time on the street? I mostly ride dirt trails. MJ via mrknowitall@hi-torque.com Good question, MJ. Mousses are not tear-offs, and while they reward you with a flat-free ride (there is no dollar equivalent to how important this […]

2003 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 many for sale; the people who have them want to keep them. Thankfully, […]

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 […]

MORE WAYS TO ENJOY BIKE RACING

There are so many ways you can get more from your passion for dirt bike racing. Yes, there is actually owning a bike and getting out and about. On top of that, though, you could attend live events, read some great books on the subject, bet on dirt bike races, or expand your dirt bike […]

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 […]

YAMAHA’S 2021 TENERE 700 ARRIVES

Yamaha has just lifted the veil on its first 2021 model. The Tenere 700 has arrived in the U.S. and will be in dealers within a month. The official press release follows.   MARIETTA, Ga. – May 22, 2020 – Yamaha Motor Corporation, USA (YMUS) today announced the 2021 Ténéré 700 arrival for the U.S. market beginning the first week […]

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 […]