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Welcome to Flex Innovations!
GP123 V2 WITH MUFFLERS
$1,050.00
Backordered
SKU: FPMGP123
Finding an engine for your aircraft is easy, but getting an affordable engine with such high power is next to impossible! The specially designed crankcase makes sure fuel is equally distributed to both cylinders. It also optimizes power, reduces vibration, and increases durability. The GP123 is a great choice for the Mamba 120!
Includes:
- GP Mufflers
- 6.6V~8.4V Ignition
- Gaskets
Recommended Props:
2-Blades
- 27×11
- 27x12th
- 28×10
- 28×12
- 29×9
- 29×10
3-Blades
- 26×12
- 27x12th on Tuned Pipes
| Specifications: |
| Displacement: |
123 c.c. |
| Bore |
46.5mm |
| RPM Range |
1500 – 8900 |
| Output |
12 Horsepower |
| Total Weight |
2300 g (5.07 lb) |
| Ignition Weight |
202 g (0.45 lb) |
| Muffler Weight |
330 g (0.73 lb) |
| Gasoline |
89-92 Unleaded |
| Gas/Oil Mix Ratio |
40:1 |
| Carburetor |
Walbro WJ-71 |
| Spark Plug |
NKG CM-6 |
| 2D Drawing Link |
GP123-Engine-2D-Drawing |
| Exploded View Link |
GP123-Exploded-View |
🚨
Flex Innovations is headed to Joe Nall!🚨
We’re getting ready for Joe Nall Week, and pre-orders are coming in strong.
Because trailer space is limited, we have to be selective with what inventory we bring—which means we may not have the exact product you’re looking for available on-site.
👉 If there’s something specific you want, the best way to guarantee it is to pre-order by placing your order by noon Monday, May 4th to ensure it’s packed and ready for pickup at Joe Nall.
Good news: pricing is the same whether you order now or purchase at the event—pre-ordering simply guarantees availability.
If there’s something specific you want, the best way to make sure you get it is to place your order now for Joe Nall pickup. Pre-ordering gives you the highest chance of getting exactly what you want, instead of hoping it’s in the trailer.
Good news: pricing is the same whether you order now or buy at the event. Just make sure you follow the below steps:
Paying by credit card?
Place your order online, select “Pick Up In Store” as the shipping method, and in the comments write: Deliver to Joe Nall 2026.
Prefer to pay cash?
Email support@flexinnovations.com or call 1-866-310-3539, and we’ll place the order for you and mark it as cash payment for Joe Nall pickup. Payment will be collected when you pick up your product at the event.
We’ll be right in the middle of it all—at the Main Flightline, 3D Line, and Electric Line.
Whether you’re picking up an order, watching demos, or just stopping by, come see everything we’ve been working on—including the Ultimate 120cc, the new RV-8 35cc, Mamba 70cc G2, and a first look at the Aura Link App.
Stop by to watch the demos and talk airplanes with the team—we’d love to see you there.
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