1. Introduction
This instruction manual provides detailed guidance for the assembly and care of your Tamiya 1/20 Grand Prix Collection No.4 J. P. S. Mk‡V Lotus 78 plastic model kit. This kit allows enthusiasts to recreate the iconic Formula One racing car in a highly detailed 1/20 scale. Please read all instructions carefully before beginning assembly to ensure a successful and enjoyable building experience.

Image 1.1: Box art for the Tamiya 1/20 Grand Prix Collection No.4 J. P. S. Mk‡V Lotus 78 model kit, showing the completed model car and some engine details.
2. Safety Information
Always prioritize safety during model assembly. This kit contains small parts and sharp tools may be required. Keep out of reach of small children due to choking hazards. Adult supervision is recommended for younger builders.
- Ventilation: Work in a well-ventilated area, especially when using paints, glues, or solvents.
- Tools: Handle hobby knives, clippers, and other sharp tools with extreme care. Always cut away from your body.
- Adhesives & Paints: Follow the manufacturer's safety instructions for all adhesives and paints used. Avoid contact with skin and eyes.
- Small Parts: Be mindful of small components that can be easily lost or swallowed.
3. Parts List
A comprehensive list of all parts, including sprue diagrams and decal sheets, is provided within the physical model kit packaging. Before starting assembly, carefully check all contents against the provided list to ensure no parts are missing or damaged. If any parts are missing or defective, please contact Tamiya customer support or your retailer.

Image 3.1: Example of model kit parts still attached to a sprue, illustrating the typical presentation of components before assembly.
4. Setup & Assembly
4.1. Preparation
Before beginning assembly, prepare your workspace and gather the necessary tools.
Recommended Tools:
- Hobby knife or sprue cutters
- Plastic cement (model glue)
- Tweezers
- Small files or sandpaper (various grits)
- Paints (acrylic or enamel, as specified in the kit instructions)
- Paintbrushes (various sizes)
- Decal setting solution (optional, but recommended)
- Clean, well-lit work surface
4.2. General Assembly Steps
Refer to the detailed, numbered diagrams and instructions provided in your kit for specific assembly sequences. The following outlines general best practices:
- Part Removal: Carefully cut parts from the sprues using sprue cutters or a hobby knife. Avoid pulling or twisting, which can damage parts.
- Cleaning: Remove any excess plastic (flash) from the parts using a hobby knife or fine sandpaper.
- Test Fit: Always test fit parts before applying glue to ensure proper alignment and fit.
- Gluing: Apply plastic cement sparingly. Hold parts together firmly until the glue sets.
- Painting: Paint parts according to the color guide provided in the kit. It is often easier to paint smaller sub-assemblies before joining them.
- Decals: Apply decals carefully using water. Use decal setting solution for better adhesion and to conform to irregular surfaces.
- Sub-Assemblies: Build the model in logical sub-assemblies (e.g., engine, chassis, cockpit, body) before combining them into the final model.

Image 4.1: A partially assembled model chassis, demonstrating the intricate details and components involved in the building process.
5. Display & Handling
Once assembled, your Tamiya Lotus 78 model is intended for display. Proper handling and display will preserve its condition.
- Display Location: Place the model on a stable, flat surface away from direct sunlight, extreme temperatures, and high humidity. These conditions can cause paint fading, decal peeling, or plastic warping.
- Handling: Always handle the model by its sturdy base or main body. Avoid touching delicate parts like mirrors, wings, or antennas, as they can break easily.
- Dust Protection: Consider displaying the model in a dust-proof display case to minimize dust accumulation and protect it from accidental damage.
6. Maintenance
Regular, gentle maintenance will keep your model looking its best.
- Dusting: Use a soft, dry brush (like a makeup brush or a dedicated model dusting brush) or a can of compressed air to gently remove dust. Do not use abrasive cloths or chemical cleaners.
- Cleaning Stains: For stubborn marks, lightly dampen a cotton swab with plain water and gently dab the area. Avoid rubbing vigorously, which can damage paint or decals. Do not use alcohol or strong cleaning agents.
- Storage: If storing the model for an extended period, ensure it is clean, dry, and placed in a protective container to prevent dust and physical damage.
7. Troubleshooting Common Assembly Issues
Here are solutions to common problems encountered during model kit assembly:
| Problem | Solution |
|---|---|
| Parts do not fit together properly. | Ensure all flash has been removed. Test fit again. If necessary, gently sand or trim mating surfaces. Verify you are using the correct parts for the step. |
| Decals are not adhering or wrinkling. | Ensure the surface is clean and smooth. Use decal setting solution to help decals conform to irregular surfaces and improve adhesion. Gently press out air bubbles with a soft cloth or cotton swab. |
| Paint finish is uneven or rough. | Ensure surfaces are clean before painting. Apply paint in thin, even coats. Allow sufficient drying time between coats. Humidity can affect paint finish; paint in a dry environment. |
| Small parts are lost. | Work on a clean, uncluttered surface. Use a tray or mat with raised edges to contain small parts. If a part is lost, check the floor or surrounding area carefully. Contact Tamiya for replacement parts if available. |
8. Specifications
Key specifications for the Tamiya 1/20 Grand Prix Collection No.4 J. P. S. Mk‡V Lotus 78 model kit:
- Model Name: J. P. S. Mk‡V Lotus 78
- Scale: 1/20
- Manufacturer: Tamiya
- Product Type: Plastic Model Kit
- Package Dimensions: 13.78 x 7.95 x 2.13 inches
- Item Weight: 12.7 ounces
- ASIN: B00BV6JKA8
9. Warranty and Support
Specific warranty information for this Tamiya model kit is typically provided within the product packaging or on the official Tamiya website. Please refer to those resources for details regarding product guarantees and return policies.
For technical assistance, missing parts, or further inquiries, please contact Tamiya customer support directly through their official website or the contact information provided in the kit. When contacting support, please have your model name and ASIN (B00BV6JKA8) ready.





