Peanut, I didn't read your last post that closely, but now that have more time, I see you had a couple of questions. I've swapped tires on my Z50 before, it had 8" rims and those rims actually came apart, making the swap fairly easy, just time consuming. I'm not sure what you mean by saying the sprocket is on the opposite side? Looks to be on the left side in that manual cover shot. Maybe some pics would help. I've always found pics to be helpful when addressing any bike problem in a forum on the Internet. There may be video tutorials available on the web too, those are helpful.
Some of those vendors at
lilhonda.com might offer Coleman parts, or something better in the way of aftermarket parts. I bought a bunch of really cool aftermarket parts when I modded out my Z50... better tires, primo shocks, aluminum swingarm, extended fork legs and burlier fork springs, gold chain, mini-thumper desert tank, Piranha 140cc motor, superior exhaust system with carbon fiber can, etc. But as an old school BMX and MX rider, I like tinkering with stuff and making it better, as in lighter, stronger and faster, lol. We used to install alloy aircraft parts on our bikes years ago...
The mini & pit bike market has grown over the decades, there are many more aftermarket parts available now than there used to be in bygone years. Dunno if the clutch/converter swap is worth doing on a Coleman bike, I never had to do anything myself except swap clutch cables on different makes. I'll say this: those boys like OLD CT at
lilhonda.com know a lot about minis & pit bikes, you can join that site for free and ask 'em whatever you wish. That's basically a spam-free site, it has a few ads but you can get rid of them pronto. Good people there, mostly... few libtards, lol.
Edit: Oh, hell, now that I read your post again, I see you have a Baja mini bike... separate make from Coleman? Maybe someone else had the Coleman. Meh, same advice applies, just find a free PDF manual for it online, and check for available parts too. Some of those vendors at the site I mentioned offer parts for a wide variety of bikes. Sorry I didn't catch that earlier, I've had a lot on my mind lately. Good news is I'm basically done with the bathrooms for now, floors get done later, so I'm gonna take a ride on my thumper this week... been away from it too long.
Further edit: Looks like Aerindel has the Coleman, I missed that earlier... these minis aren't that hard to work on though, no matter what the make. Finding parts for some bikes can be a challenge, but vendors have made it easier nowadays and you can usually find stuff online.