Screaming yellow zonker: Minicycle
technology hasn’t advanced much in the
last 30 years. Here sits a 1983 Suzuki RM80.
A QUESTION ABOUT SUZUKI RM85 JETTING Dear MXA, I own a 2003 Suzuki RM85. Yes, I know it is old, but it’s all I have. It isn’t jetted right. It ran okay this winter, but now it blubbers. What should I do? In stock trim, the 2003 RM85 was rich. That is why it felt fine during the winter. Cold air has a higher oxygen content and requires a larger main and pilot. However, when the weather warms up, the jetting needs to be leaned out. Drop the stock 125 mainjet for a 122 and the stock 50 pilot for a 48. Use the needle clip position to fine-tune for local conditions. The air screw should be two turns out (counterclockwise).
Fact: An AMA
wouldn’t be a
WHY A 2-2 BEATS A 1-3— AND WHY IT DOESN’T Dear MXA, What am I missing? I see AMA Pro races where it is obvious that the guy with the 2-2 beat the guy with the 1-3, but then at the trophy presentation, they give the trophy to the other guy. How does this happen? At every local race in America, a 2-2 will beat a 1-3, but in the AMA Nationals, they don’t use the Olympic scoring system, where the places are added together and the lowest number wins—and ties are broken by the better second moto. Instead, they use the points system. First place pays 25 points, second 22 and third 20. With simple math, you can see that a 2-2 score is worth 44 points, while a 1-3 is worth 45 points. Don’t feel alone; many race fans, and sometimes even the announcers, leave the track without knowing who finished where.
Rear guard: The rear tire
takes the brunt of the abuse
that a motocross bike dishes
out. The front tire is just
FRONT SNEAKER LIFE Dear MXA, I’m new to racing. My rear tire is very worn out and it is time to replace it, but what about the front tire? Should I replace the front tire every time I replace the rear tire? No. Rear tires wear out much quicker than front tires because they are driven, support more weight and can be spun. Every heat cycle that the tire undergoes will affect the properties of the tread, rubber compound and casing construction. Most MXA test riders change their rear tires every five races, but they only change the front tire every two to three rear-tire changes.