Hi, I'd personally forget the foam and put him in a correctly fitting seat. Your right he will grow but you can get a good enough seat that's the correct size without spending a fortune at this time, they key part is to get it fitted correctly for optimum weight distribution before you add lead. The seat position is absolutely critical in a kart. Get that wrong or have a driver rattling around in a loosely fitting seat and you'll be instantly miles off the pace.
We have lead bolted to the rear of the seat and to the left side of it. We also had some more up front on the floor tray to even out the weight distribution but that didn't work that well for us.
My lad is also only 7 and we stared off in an old cadet, like you not wanting to spend the money before we were ready to race. I can say from experience it was a bad decision on my part. All i did was subconsciously program his brain with a slow and ill handling kart. I really noticed that when we put him in a new Zip Lightening and his lap times stayed the same. He just drove the new new, perfectly weighted and powerful kart exactly the same as he drove the old kart.
Get it right from the start otherwise he'll be learning it all twice. :-)
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