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Setting
Shock Spring Preload and Race Sag Adjustment:
The adjustment procedure that follows establishes the correct starting
point for any suspension tuning. It guides you to both proper spring preload adjustment and spring selection for your specific
needs. damping adjustments are described later on this page.
The first step toward determining propoer suspension
adjustment is to set the rear spring preload so that the proper ride height, or race sag setting is achieved.
For
this adjustment procedure, the bike should be brought to normal racing weight-correct fuel, transmission oil and coolant levels.
1.) First measure the unloaded dimension when your bike is supported by a workstand with both wheels off the ground.
Measure the distance from the center of the rear fender mounting bolt to the center of the chain adjuster lock nut. We will
call this measurement A.
2.) Next measure the Loaded dimension with the rider seated on the bike wearing all normal
riding gear. Ask a friend to steady the bike perfectly upright so you can put both feet on the pegs. Youll need another helper
to measure. Bounce your weight on the seat a few times to help the suspension overcome any stiction and settle to a good reference
point. We will call this measurement B.
Example:
Unloaded Measurement A 615mm
-Loaded Measurement
B 515mm
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Race Sag 100mm
The Race sag dimension is the difference between the Unloaded and the Loaded measurements.
A Race
sag setting of example 90mm improves turning ability for tight tracks at the cost of slightly reduced straight line stability.
Setting the dimension at 110mm improves stability on faster tracks with less turns, but reduces turning performance slightly.
To much rider sag indiciates you must increase shock preload to the spring by turning the Spring Preload Adjuster
CLOCKWISE.
To little rider sag indicates you must decrease shock preload to the spring by turning the Spring Preload
Adjuster COUNTER CLOCKWISE.
Race
Sag is the most important key in suspension set-up. Please check your sag.
Recommendations for Race sag
Bike Size 50cc-65cc 85cc-100cc 125cc-650cc
Sag- 70mm 95mm-102mm 102mm-120mm
Free Sag 25mm-35mm 25mm-35mm 25mm-45mm
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Free Sag Measurement
Next
you must compare the rear suspension sag under the weight of the sprung portion of the bike alone (without riders weight)
to the Unloaded dimension. With the bike off the stand and on the ground with both wheels, push down on the back end of the
bike and let the bike come up itself. Measure between the same 2 points Measurement A - Measurement C
Example:
Unloaded Measurement A= 615mm
Loaded
Measurement B= 580mm
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Free-Sag (without rider) = 35mm
A spring
thats to soft for your weight requires so much preload to achieve the proper race sag that it makes the rear end top out when
the riders dismounts.
If the spring rate is to soft, you have to put a lot of
preload on the spring to keep the desired ride height, or race sag. As a result, the weight transfer is incorrect and the
rear end tops-out under even light braking and downhills.
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Fork Tube Height
Fork Tube height is a very important part of the setup of your motorcycle. Balance
of the bike is very important to your chassis. Fork height measurements are taken in MM. Check your MB1 Manuel for your recommendation
height.
Fork height tuning- Lowering your forks in the clamps will put less weight on the front end and will improve
stability at higher speeds, but will be harder to turn. Raising your forks in the clamps will place more weight on the front
end and will improve turning but will have less stability at higher speeds.
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Proper installation
of your front forks
If your forks are feeling to harsh in the mid stroke after getting them back from
having them worked on, you might have a problem with your pinch bolts being to tight or improper installation. Please read
the steps below
1.) Put each fork into the triple clamp and measure from the top of the fork tube to the top of
the upper triple clamp and make sure both forks are the same distance when installing.
2.) Torque the triple clamps
bolts to the manufacturer spec. Typically 15-16ft/lbs. If you over tighten these bolts, it will cause the bushings to bind
as the fork compresses.
3.) Install front tire amd axle bolt and torque to spec.
4.) Make sure the axle
pinch bolts are loose. Take the bike off the stand and push on the bars a few times so the forks compress. Place the bike
back onto the stand.
5.) Torque your fork pinch bolts to spec and you should be ready to race!
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