Doc, the next thing you've got to do is to shim the idler pulley (or its bracket) until the belt is running dead straight. Take the bottom cover off and hold the car so you can see what's going on, then run it. You'll see right away.
Also, we suggest you use the Losi pulleys from the xx-4. You must buy two sets because on the xx-4 the front & rear are different and the X - 5 uses two rears. I think we still have some. The teeth on our pulleys are not perfect, and that is not good for belt life. This does greatly effect gear ratio. Our larger pulleys are 1.75, the Losi are 1.56; therefore you need a larger spur (I think we still have a 110) and (relatively) small pinion to get the same final drive.
BTW, the Losi belts are the only ones that fit the pulleys. Standard in the Kit was the yellow xxx-S #3209. We may have one of them still. You can try some other belts, but the Losi belts and pulleys use a non-standard tooth. Our problem was that we didn't duplicate the tooth perfectly.
It's a car you've got to stay on top of, but you're right -- it's still mighty fast. And a ton of fun if you like wrenching and going fast.
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