MOTOCROSS ACTION MID-WEEK REPORT
Rider: Ken Roczen
Bike: 2019 factory Honda CRF450
Location: Seattle, Washington, Supercross
Photographer: Daryl Ecklund
F Stop: 5.6
Shutter speed: 1/1600
TWO-STROKE SPOTLIGHT: DANIEL JOHNSON’S 1999 SUZUKI RM250
I started with a 1999 RM250 I brought for $1500 barely running and in terrible shape. I had a set of triple clamps and Showa SFF spring forks off my 2016 RM-Z250 race bike and they bolted straight up to the 1999 frame. Secondly I didn’t realize that Suzuki actually changed their shade of yellow in 2001 so I had to fit a 2002-2008 RM125 tank with current shape tank shrouds. The rear end is all 1999. The hardest part of the build was making a custom seat to fit the newer tank but also fit the old rear subframe. The suspension from the RM-Z works a treat with the old steel frame. The engine was fully rebuilt with all genuine parts and soda blasted. The rim set was custom made using a billet 1999 rear hub and a 2016 front hub. Even the 1999 brakes bolted straight up to the 2016 forks! The build ended up costing more than a new bike but there’s not many RM’s in this kinda shape with the modern suspension package. I also had the stock pipe sand blasted and gave it my own works treatment, with a heat gun and some sump oil from my truck. A brand new Keihin carb and Pro Circuit R304 silencer. Also I had 2017 RM-Z graphics printed to a 2008 RM250 template to give it the modern look as well as a 2013 RM-Z stock seat cover. I love the classic rear end mixed in with the modern front and it’s more than just a re-style when you factor in the modern suspension.
MOTO | TRIVIA
FORGOTTEN BIKES: 1995 YAMAHA YZ250
RAW SEATTLE SUPERCROSS FOTTAGE
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THEY SAID IT | 2019 SEATTLE SUPERCROSS
2019 DAYTONA SX: 106 RACERS BROUGHT TO THE LOCAL HOSPITAL BETWEEN THE PRO & AMATEUR SX DAY
MXA PRODUCT SPOTLIGHT: QUALIFIER FOOT PEGS BY MOOSE RACING
130 LBS PERSPECTIVE: 2019 SUZUKI RM-Z250 PART 2
By Brian Medeiros
“What’s up Motocross Action. Test rider Brian Medeiros here bringing you part two of the RM-Z250 suspension test. For this test my goal was to see how the RM-Z would react with the right spring rate’s for my weight. My purpose for this test was to give you a base line to go off of because let’s face it, you just spend a good chunk of change on your new motorcycle and maybe you aren’t ready to spend the money on getting a full re-valve right away. So, will getting the right spring rate help? Let’s go over some data.
To clear up some of the confusion on the BFRC rear shock, it does not have the rebound adjuster in the conventional location (on the shock shaft) because there is no valving on the shaft itself. It is located all up top where the high-speed and low-speed adjusters are located on a conventional shock. On the BFRC shock the high-speed and low-speed adjuster are one adjuster measured in turns. The rebound adjuster is also measured in turns.
For my weight I went with a 5.2 kg/mm shock spring, and .47 kg/mm fork springs. With the correct shock spring I was able to get my sag to 106 mm which in turn made the bike feel level. On the compression adjustment I was able to run a stiffer setting compared to having the stock shock spring on. After riding the bike my final shock settings where 3 turns out on compression (1 turn is stock) and rebound was 2 turns out (1 turn is stock). With this setting I had good squat and traction on acceleration as well as good rear end stability on the entrances of corners. This setting also gave me a nice plush feel on hard landings, while still keeping good bottoming resistance.
As far as forks go, the correct springs gave the me ability to really feel the valving characteristics of the forks As the stock valving Suzuki did a great job. The initial part of the stroke was plush and also had great bottoming resistance. I ended up at 12 clicks out on the forks opposed to 14 clicks out with the standard springs. On rebound I ended up at 10 clicks out opposed to my 9 clicks with the standard springs. I felt that speeding up the rebound helped the front wheel tracked better. I could feel the action of the front tire which in turn really helped with being able to know how hard you can push it before losing traction.
So does getting the right spring rate help? The answer is yes. Remember if you don’t have the money to get your RM-Z250 suspension revalved, just get the correct spring rate for your weight and that will help you out a lot, especially if your a light guy like me.”
Brian Medeiros #934
WE SCREAM RYAN VILLOPOTO’S YZ125 TWO-STROKE
WORKS CONNECTION NOW OFFERS CUSTOMIZED FRONT BRAKE & CLUTCH CAPS
CLASSIC MXA PHOTO
Moto Trivia answer: Jeff Alessi.