Ridenm thanks for the detailed reply and I appreciate everybody's feedback. I had a good ride on my cycle today and by the time I got back my kid was raring to go. We hit some dirt trails near the house that had softened up nicely and it was the first time I think he *really* enjoyed himself on it. Especially when he realized he could spin it out and make some roost. The soft dirt softened the throttle hit as well. He ended up doing a bunch of hill climbing and I was impressed how he stayed on the pegs and let the bike do the work, even at very slow speeds. We're going to have a lot of fun with this thing, and hopefully more once I get the sprocket sorted and address the throttle dead zone.
Next time out I'll get some pics.
Oh and thanks for the Trials Central linky! I've been over there poking around but hadn't found that thread. Looks like they might have beaten me to the punch! If this turns into a decent thread I'll add the good links to the original post so they're easier to find.