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I guess the photo I found was of the wrong buggy. Sorry. Like WTR said, no governor on that type of engine. The photo I found showed a clone style engine. The specs you gave don’t match the photo.

Accelerator floored isn’t a problem. Let’s assume your kart with stock gearing goes 38 mph at 3800 RPM. To go 45 mph, you need to turn the engine 4500 RPMs. Adjusting (or removing) the governor could possibly get you there, but I suspect the kart may struggle to accelerate above 38 mph...

It’s a big and heavy kart with a gx200 knockoff engine. Probably near the the limits of the available power at 38mph. I’ll try to find a video of the method I like to use to remove governors from these engines. It involves taking off the flywheel to punch out a pin from block that holds the...

I’d have to look to see what engine is on your kart. There are two “main” types of engines used on karts. Based on the name, I’m guessing it’s a 200cc 4 stroke. There are gx200 style knockoff off utility engines, but I suspect you have a GY6 style motorcycle/scooter engine. The former...

Get it running, maybe lifted up on blocks so it doesn’t run away… Spray some starting fluid around the gasket surface on the engine side of the carb. Not the air filter side. Listen to hear if the RPMs change. If the fluid finds a leak, you’ll hear the rpm’s change. If a different carb than...

Gokarts have two driving modes. stomped to floor - or braking. lol 38mph is probably near the limit for a street legal kart powered by a 200cc engine. Might need mo’ powaaa to get mo’ velo. You don’t get extra top speed for free. It costs wear n tear on clutches, and/of belts. It costs...

Dirty carb (clogged jets)? Intake leak?

I don’t know what this is. Overhead Cam? Where’s the push rods? Predators don’t have the things I see in your photos.

So the NIBBI is a flange style carb? That does t match the stud spacing of the head? Most of the intake adapters I’ve played with are for spigot style carbs. Metal adapters with a rubber sleeve. The only time I needed a flange to flange adapter is when I put a gx390 carb on a 212. PS. I see...

wooden shoe house

This is the best video I’ve found to teach how to tune a pilot circuit.

Well besides a damaged valve or spring, I think you looked all the stuff that came to my mind. No leaks in intake or exhaust. Valves lashed properly. Larger pilot jet. Check out a few dirt bike 4 stroke pilot jet tuning videos to see if the jetting seems correct. A different, more tunable...

You can also check for intake leaks behind the carb. Get it running and spray starter fluid around the seals / gaskets / spigots … listen for rpm change. If the rpm’s go up or down, there’s a leak. what’s going on here in the photo? Like I said I’m not familiar with these engines and the photo...

Maybe set valve lash.

If performance is good otherwise, I’d say don’t worry about it. But because there is still stock exhaust with muffler, I wouldn’t expect popping. I’ve never run a GY6 type engine so I’m not too familiar with them. I’d suggest cleaning the carb, but you said it was brand new and it has a new...

represented by Gargamel

Pilot jet is not the main jet. Pilot jet is sometimes called the idle jet. See my first post. Popping on deceleration is caused by an “after-burn” in the exhaust not to be confused with a backfire in the intake. When letting off the throttle, the butterfly valve closes. The engine is turning...

This set goes from 0.014” to 0.039”. I believe it should cover your pilot jet needs. Find which one fits, then drill out to next larger size. Then test again and repeat if needed. https://a.co/d/5SDwBkP

colored Smurfs attacking

I think this video does a good job at explaining idle circuit tuning