Set Details
- Set Number
- 71704
- Name
- Kai Fighter
- Theme
- Ninjago
- Year
- 2020
- Pieces
- 513
- Complexity
- Substantial
- Build Time
- 2-4 hours
- Ages
- 10+
- Type
- Play-focused
About LEGO Kai Fighter
LEGO Kai Fighter (set #71704) is a large, detailed build with 513 pieces from the Ninjago theme, released in 2020. The Ninjago line features ninja-themed action sets with spinners, mechs, and dragons. At 513 pieces, this is a substantial-level build with an estimated build time of 2-4 hours, suitable for ages 10+.
Set Highlights
- 513 pieces at substantial complexity — a 2-4 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Play-focused build with interactive elements designed for 10+ builders.
Who Is This Set For?
Gift for Ages 10+
The substantial difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 10+ age range.
Weekend Build Project
513 pieces with an estimated 2-4 hours fits comfortably into a focused afternoon or weekend session.
Expanding a Ninjago Collection
A solid addition for collectors building out their Ninjago shelf. Introduces parts and builds that complement other sets from the same line.
Build Tips
A five-minute sort by color or piece type before starting saves time hunting for specific bricks mid-step.
Follow the numbered steps in sequence — structural elements early in the build support everything that comes after.
For active play sets, key connection points (hinges, turntables, clip joints) can loosen over time — a small dab of LEGO's own tube clutch lubricant on the stud resolves most looseness without damage.
Finding Instructions
Building instructions for LEGO Kai Fighter (#71704) are available as a free PDF on LEGO.com. You can also upload a photo of this set to LegoFinder to identify it and access the instructions directly.
Kai Fighter FAQ
Related Reading
More Ninjago Sets
See all Ninjago →
Also Released in 2020
All 2020 sets →Similar Build Difficulty
Sets at roughly the same piece count and complexity tier — different theme and year, but a similar build experience.
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