Predator 90

I purchased my son a predator 90, wasn’t used much, still has chalk marks on the tires, it’s an orange 04. We got back into the sport recently, health issues on my end put a stop and forced us to get rid of our last machines for a few years. He’s 9, and we now are riding about every chance we get, I like the machine, his last bike was a Honda Trx 90, and I see posts all over but there are a lot of links, and sites that just don’t work. So my questions are probably the same old thing but any help or if there’s a member on here who can give me advise I would appreciate it. He’s ready for mods so I removed the cdi jumper, still not enough so..
Which cdi with Rev limiter deleted are most people using
I see older posts on nerf bars, anyone know which ones can be made to fit or do
Widening the machine? Is there a arms and axles out there? Anyone have experience with a diamond J custom setup? Not the route I want to go.. but if needed.. I will
Bumpers and grab bars, what is out there, I don’t see a lot
Oil injection delete, I see basic information on doing it, I’d like a block off kit, but don’t see one, and going the route and doing it yourself is fine, there’s just many people who do it a ton of ways, which one works best
We ride a local private track, so any help with mods, and what works even with some fabrication would be great, I see a lot of chassis parts for outlaws, even parts for the chassis that can cross over or be made to would work. I only have a few decent years left myself, so I’d like to get this thing closer to what he wants, and this winter if he wants, I’ll build a MX mini with him if he chooses.
Thanks any help or direction towards somebody on here who has done so basic mods would be greatly appreciated