From: www.teamlosi.com

"Tweaking" your XXX-S
What does tweaking your car mean?
It is balancing the front of the car to the rear. By not having your car tweaked flat you may experience a push to the right and your car being loose to the left or vice versa. By adjusting all four shocks and making all four corners of your car evenly preloaded will result in a well balanced and smooth feel with your car.
Before you can "tweak" your car, your XXX-S needs to be in good running order. Be sure that that all the ball cups rotate freely, the shocks are clean and operating smoothly and that all hinge pins and suspension mount points move freely. If any of these parts are bound in any way, this will affect the "tweak" of you sedan.

Now take your hobby knife (a lot of the top racers like to use a hobby knife to find the perfect center on their car. Please use caution when using a hobby knife for this exercise) or 1/16” Team Losi Allen wrench and push up on the center in the rear of the car with your tool. This is done on the rear bumper. If your car is not perfectly tweaked, one tire will start to rise before the other. In the picture below we find that the left tire rises before the right tire. This means your car is not TWEAKED properly.


As shown in the picture above, to fix this problem you will want to apply pressure to the left rear side and relieve pressure from the right rear side of the car. This is done by putting more preload on the right front shock (adjusting collar clockwise) and taking away a small amount of preload on the left front shock(adjusting collar counter-clockwise). Keep in mind when doing this you will only need to adjust the preloads of your shocks slightly to get the tweak corrected. You now have the front of your car tweaked flat with the rear. As shown in the picture below.

Now we are going to "tweak" the front end of the car. This is done the same way as in the previous steps. With the front end of your XXXs facing you, find the center of the car (use the bumper) and score or mark it like we did the rear. Now take your hobby knife or 1/16" Team Losi wrench, and slowly push up on the front until one or both of the tires come off the ground. If both front tires come off the ground simultaneously, your car is tweaked perfectly flat. If the left front (with the front of the car facing you) comes off the ground first you will need to apply more preload to the right rear shock (adjust collar clockwise) and reduce the preload on the left rear shock (adjust collar counter-clockwise). Check your tweak again until you get both front tires to rise off the ground simultaneously.
These tips should help get you on the road to successfully racing your Team Losi XXX-S.
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From: www.teamlosi.com