Deciding to convert golf cart from electric to gas is usually born out of a specific kind of frustration that only an electric cart owner knows. You're halfway through a project, or maybe just a few miles from home, and the batteries start to give up. The pedal feels soft, the speed drops, and you're suddenly praying for a downhill stretch. While electric carts are quiet and great for neighborhood cruising, they have a "leash"—and that leash is the battery life.
If you're tired of the eight-hour charge times and the thousand-dollar bill every few years for a new set of lead-acid batteries, a gas conversion starts to look pretty tempting. But before you go ripping out those heavy batteries, there's a lot to consider. It's a big project, it's a bit greasy, and it's definitely not a "one-afternoon" kind of job. Let's get into the weeds of what this actually takes.
Why even bother with the swap?
Most people start looking into this because their current battery pack is toast. When you realize that a fresh set of high-quality deep-cycle batteries costs nearly as much as a used gas cart, you start doing the math. Gas offers something electric just can't: infinite range. As long as you have a five-gallon jerry can in the garage, you're good to go.
Gas carts are also generally better for work. If you're using your cart to haul firewood, pull a trailer, or navigate hilly terrain, the raw torque and consistent power of a small gas engine often beat out an older 36-volt or 48-volt electric system. Plus, there's no "fade." A gas engine runs at 100% until the tank is empty, whereas an electric cart gets slower and weaker as the voltage drops.
The big hurdle: The transaxle problem
Here's the part where most people get stuck. You can't just bolt a gas engine where the electric motor used to be and call it a day. In an electric cart, the motor is bolted directly to a transaxle that is designed to spin based on electrical input. It doesn't have a neutral gear in the way a gas cart does, and it certainly doesn't have the input shaft required for a belt-driven CVT (Continuously Variable Transmission) system.
To truly convert golf cart from electric to gas, you essentially have two choices. You can try to find a gas-model transaxle from a donor cart of the same brand, or you can use a conversion kit that utilizes your existing setup—though the latter is rare and often complicated. Most successful DIYers end up sourcing a rear end from a scrapped gas cart. This allows you to use a standard drive clutch and driven clutch setup, which is how almost all gas golf carts operate.
Choosing your new "heart"
If you're going through the trouble of a conversion, you probably aren't looking for a puny 9-horsepower stock engine. This is where things get fun. A lot of folks go for "big block" swaps. Engines like the Predator 420cc from Harbor Freight are incredibly popular for this. They're cheap, parts are everywhere, and they provide way more "oomph" than a standard golf cart engine.
However, keep in mind that these are industrial engines. They aren't designed to be quiet. A stock golf cart engine (like a Yamaha or Kawasaki) is designed to be whisper-quiet for the golf course. A Predator or a Honda GX390 is going to sound like a lawnmower or a go-kart. If you're okay with a bit of noise and vibration, the power trade-off is massive.
The "Start-Stop" vs. "Idle" dilemma
Standard gas golf carts use a starter-generator. When you step on the gas, the engine fires up and moves the cart. When you let off, the engine shuts off completely. It's great for saving fuel and keeping things quiet.
When you convert golf cart from electric to gas using an industrial engine, you're usually moving to an "idle" system. The engine stays running while you're stopped at a stop sign, just like a car. This requires a different type of clutch setup (a centrifugal clutch or a tuned CVT) so the cart doesn't try to crawl away while it's idling.
Parts you're going to need
Don't underestimate the "little things." The engine is the easy part. The list of supporting hardware is what usually eats up the budget:
- Engine Mount: You'll need a plate to bolt the engine to the frame. Since your cart was never meant to have an engine, you'll likely be doing some drilling or welding here.
- The Clutch System: You need a primary clutch for the engine and a driven clutch for the transaxle. These need to be aligned perfectly, or you'll shred belts every twenty minutes.
- Exhaust: Unless you want to go deaf, you'll need a muffler. Fitting a muffler into the tight engine bay of an electric cart often requires some creative pipe bending.
- Fuel System: You'll need a fuel tank, a fuel pump (usually pulse-driven from the engine), and fuel lines.
- Electrical: Even though it's a gas cart, you still need a battery to start the engine, a key switch, and wiring for the kill circuit.
Is it actually worth the work?
I'll be honest with you: this isn't for everyone. If you aren't comfortable with a wrench and a multimeter, this project will be a nightmare. You're going to run into "custom" problems that YouTube videos can't always solve. Things like throttle cable linkage and shift cable alignment can take hours of trial and error to get right.
However, if you enjoy fabrication and want a cart that can run all day long without ever seeing a wall outlet, it's a very rewarding project. There's a certain satisfaction in hearing that engine roar to life for the first time in a frame that used to be silent.
The cost breakdown
Let's talk numbers. To convert golf cart from electric to gas, you're looking at a wide range of costs. If you find a cheap donor engine and fab your own mounts, you might get away with spending $600 to $800. If you buy a pre-made conversion kit (which includes the mount, clutches, and belt), you're easily looking at $1,200 to $2,000, and that's before you even buy the engine itself.
Compare that to the cost of a new lithium battery drop-in kit. Lithium is the "new" way to fix electric cart problems. It's lighter and lasts much longer than lead-acid. If you just want reliability without the grease, lithium might be the better play. But if you want the "cool factor" and the unlimited range of gasoline, the conversion is the way to go.
Final thoughts on the process
Before you start, check your local laws. Some gated communities or campgrounds have strict "no gas carts" rules because of the noise and exhaust. It would be a huge bummer to spend three months on a conversion only to find out you aren't allowed to drive it where you live.
If you've weighed the pros and cons and you're ready to dive in, my biggest piece of advice is to measure twice and cut once. Alignment is the most critical part of the whole build. If your engine is slightly crooked, the belt will slip, and you'll lose power. Get that engine sitting square, make sure your fuel lines are far away from the hot exhaust, and you'll have a machine that'll outlast any battery on the market.
It's a lot of work, sure, but once you're cruising through the woods without a single worry about your "state of charge," you'll know it was worth the effort. There's just something about a gas-powered cart that feels more like a real vehicle and less like a golf course rental. Happy building!