So, my little gamble on the pushrods paid off. I did some searching and couldn't find anything off the shelf for the CG250 that would work. Most options were either too small (3/16") or too big (5/16"+). Thankfully, Honda builds another engine that uses the same diameter pushrods as the CG engines, which is the GX390.
The good news is that the GX390 is a popular go cart and mini bike platform, so there is a good amount of aftermarket support for them. The downside is that most of the ready made GX390 Pushrods are too long. So that leaves option 3, which is to order a set of cut to length chromoly pushrods.
ARC Racing offers just such a thing.
https://www.arcracing.com/dj-3070cl-...-individually/
They came in today, only 3 days to ship too, which was really amazing.
I ordered a set of GX390 lifters to assist with pressing them together. They were cheap, so why not. Prevents me from damaging the ends. I can always pass them along to someone else when I am through with them.
Anyway, I just figured I would prove that the ends are the same dimensions, so this first picture is the GX390 lifter and the original CG250 Cam follower.
The second picture is the end of the pushrod in said cam follower.
So on to the details. The CG250 Pushrods are 153mm long, or 6.024" long. Since I milled down my head 1mm, I am going to cut these pushrods to be a bit shorter at 6 inches even.
The pressed in tip is 5/16" long from flange to end, so I need to cut my pushrods to 5 11/16" long. Pretty straight forward. Hopefully I have the time tomorrow, but I may hold off until next weekend because I want to finish getting my jetting sorted and repack my muffler.
The jetting might not actually take very long though. Currently my idle mixture, pilot, and needle settings are spot on, and the bike pulls strong until you hit the last 1/8th bit of throttle, and it just goes flat, so it needs a bit more fuel. I just got my 142-150 main jets in, so I should be able to get it sorted fairly quickly. I might even take it out tonight and test one or two jets if I feel up to it.