Carb problems

So when we pulled this out of my FIL's shed, he told me why it wrecked and why he parked it: he was riding it around, the throttle stuck wide open causing uncontrolled acceleration, so he tried to pull it up into a wheelie and jumped off the back, letting it crash itself.

I pulled apart the carb earlier and found almost immediately that the slide itself would get good and stuck in the bore at wide open throttle position. Somehow I managed to get the slide out, but not without worrying if I was ever gonna get it back together again. 

Let's check out the carb. It's a Keihin "PD11A", and I can't find a lick of info about it online 🫤

This is the slide bore:

Note the "polished" areas inside and around the top edge - these are high spots that prevented the slide from being able to move up and down freely.

Here is the slide itself:

I was able to sand down the high spots inside the bore with 220 and 400 grit sandpaper (wet sand + dry sand on both grits) and give the slide itself a nice finish. It now moves freely in and out of the bore without sticking at all. Now I just need to find a rebuild kit... Wish me luck.