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Baby steps ! Nice work.

Bogging is more often a lean problem than rich.. As Frank said , I'd pull the carb once more and look for any tiny, and I mean tiny holes in the tubes to the jets . They can be missed very easily because they're so small and not a brass jet as the bigger ones are . I don't know if your carb has the holes I'm talking about but many do.. Carbs and fuel mixture settings are often accompanied by a lot of my verbal lubrication here. Sometimes I wish I was multi-lingual so I'd have access to a broader range of "lubricant " phrases. They're so handy when fiddling with the small stuff and much better to use them than start tossing tools LOL

I have done next to zero work on ATVs myself other than maintaining my own and helping friends with minor repairs and welding. I have messed with old school cars which are very comparable to non-electronic controlled ATVs. A carb is a carb whether it is on as car , ATV or any other machine .. They may be built and look different but they all mix fuel and air to run. The trick is finding all the quirks in how each is jetted and adjusted .. That's where manuals and advice from owners of similar machines come in. As far as the electrical end of it comes , I'm comfortable with points and coils, but have to rely on advice from others and, again, manuals when dealing with CDI boxes and electronics on newer ATVs. I know my way around multimeters and basic electricity. Got my HAM ticket back in the '70s so learned a lot of electrical theory to do that . I'm a retired Millwright and have tinkered with cars since my first one over 60 years ago, so I do know the frustration of working in tight spaces at times fixing things that engineers designed to be easy to build but hell to maintain. Most of the time when someone has a problem I might be able to help with, Frank beats me to it and gives very good advice . I can only add a little to some of it some of the time . I spend entirely too much time on my computer so I do know my way around searching for answers to all sorts of things. The flexible screwdrivers offered today are a lot more refined than back in the day I bought one.. Old ones were simply a flat head with a cable like shaft and handle. I never saw any with a Philips or any Robertson head. Now they generally all have heads where you can use any of the various inserts. Good luck on getting that carb tuned .. Takes a bit of time and patience ..... and far too often a lot of ummmmm " Verbal lubrication" to get the job done.

I would check used parts at http://car-part.com/ it will show you some compatibility and local junk yards.

I made my intro about a QuadRunner I was working on and found a multitude of problems. Most I fixed, but I'm thinking that I'll be making more trips to see the 90' LT-250/4WD. Age and needing regular attention is the reason. The owner, NOT being mechanically inclined, adds into the equation. So, I deliver it and was offered, as payment, a 95' LT-250/4WD, with paper. It didn't run and had been sitting outside for last 12+ months. It was (basically) all there. This happened Saturday and this "Barn Find" came home to live out it's final years (I suspect). Today I finally found time to look at her. Not a pretty sight. Rough life, many hrs....... MANY! Only 2399mi, but the speedo is disco'd. I just want to know if this will be worth pursuing. First things first, a really good cleaning. I hate working on dirty vehicles. The battery actually took and held a charge! The carb was pulled, cleaned and the tank drained. Found a broken orange wire, dangling loose, near the carb. It was hot when the key was on and ended up connecting to a 10A fuse block. Well, I wonder why it didn't run???? Hmmmmmmmmmmmmm! Carb back on, fresh non-eth fuel, had to remove the air filter for this test (needs replacement), sprayed a little ether..... hit the starter, fired and died. Third time's a charm, she runs. I'll be going thru things as I can and questions will follow, in this thread. WOOHOO!!!