Marianne Martinez
Mounting a cafe seat pan is a task that requires careful consideration and the right tools. While some opt for a custom-made seat pan, others prefer to purchase one online and modify it to fit their bike. The process involves welding or clamping mounts to the frame, using bolts, nuts, and washers, or even industrial-strength Velcro. Some prefer to use existing hinges and simple fabrication, while others reinforce the seat pan with aluminium or fibreglass. The perfect cafe racer seat is within reach with the right materials and techniques.
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Using bolts and nuts
To mount a cafe seat pan using bolts and nuts, you can follow these steps:
First, prepare the area by covering the tank fixing section and frame rails with tape and cardboard off-cuts. This will create a buffer for the upholstery and foam. Run a thin layer of beeswax or a release agent over the tape.
Next, mark the position of the clamps with a sharpie on the portion that faces upwards from the frame. Remove the clamps and drill holes where you've marked, ensuring they are large enough to fit the bolts. Drill a hole of the same diameter through the middle of a rubber stopper, then place the bolt through the hose clamp, add the rubber stopper, and fit the assembly back onto the frame. Repeat this process for each bolt.
Now, grab your seat pan and some paint. Apply paint to the top of the bolts and place your seat pan on top, allowing the paint to mark where you need to drill holes for the bolts. Once you have clear marks on the underside of the seat pan, drill the holes.
After that, you can slide the seat pan down over the bolts and tighten it with nuts. Cover the bolts and nuts with upholstery.
If you're working with a shorter seat pan, two bolts should be sufficient. However, for a longer seat pan, consider adding a third tab and bolt at the rear for additional support.
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Velcro
While some people express concerns about using Velcro to mount a cafe seat pan, others have successfully used it. One user recommends industrial-strength Velcro, which is super strong, so you don't need a lot, and the seat won't move, even when road racing. It will also come apart when you need it to.
Another user shares their experience using Velcro to mount a cafe seat pan to their GS750. They used heavy-duty Velcro, which they claim is strong enough to keep the seat in place even when lifting the front wheel and going over 100 mph. They also mention that using Velcro has the advantage of not having to worry about stress cracks in your fibreglass or drilling holes in the frame to mount the seat.
If you plan to use Velcro to mount your cafe seat pan, here are some steps you can follow:
- Prepare the surface: Ensure that the area where you will attach the Velcro is clean, dry, and free of any debris.
- Measure and cut the Velcro: Determine the size and placement of the Velcro strips needed to secure the seat pan. Cut the Velcro to the desired length and width.
- Attach the Velcro: Peel back the adhesive backing from the Velcro strips and carefully attach them to the designated areas on the seat pan and the frame of the motorcycle. Follow the instructions on the Velcro packaging for proper application.
- Test the adhesion: Before placing the seat pan on the motorcycle, press the Velcro strips together and ensure they are securely attached.
- Mount the seat pan: Carefully align the seat pan with the mounting points on the motorcycle and firmly press it into place. Adjust as needed to ensure a snug fit.
It is important to note that while Velcro can be a convenient option for mounting a cafe seat pan, it may not be suitable for all situations. Some riders prefer more secure methods, such as bolts, hinges, or latch mechanisms. Ultimately, the choice of mounting method depends on personal preference, the specific motorcycle, and riding conditions.
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Hinge and fabrication
One method is to weld two tabs onto the frame rails and attach two M6 bolts to a 15mm flat bar to secure the seat pan. If welding is not an option, you can utilise existing fixings in the seat area and drill holes to secure the bolts with lock nuts and thread glue. Before fibreglassing, you can apply beeswax or a release agent to the thread.
Another approach is to use an existing hinge and perform simple fabrication. This may involve adding a fore and aft brace and making adjustments to ensure the seat pan meets the tank properly when upholstered. Some users have also adapted latch mechanisms from marine parts to securely hold the seat down.
When creating a custom metal seat pan, it is important to consider the quality of the hinge and latch mechanism. Tabs and other parts ready to weld on can be sourced from suppliers like BUNGKING, saving time and effort in fabrication.
Overall, the hinge and fabrication process for mounting a cafe seat pan can vary depending on individual preferences and the specific requirements of the bike. It is important to consider the pros and cons of different methods and make adjustments as needed to ensure a secure and proper fit.
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Welding
When welding a cafe seat pan, it is recommended to weld two tabs onto the frame rails and two M6 bolts to a 15mm flat bar to suit them. For longer seat pans, a third tab and bolt at the rear may be necessary. If welding is not an option, you can try to utilize existing fixings in the seat area. Instead of welding the bolts into the bar, you can drill holes and use a lock nut and thread glue.
The type of welding and welder used will depend on the specific project and materials. For example, the thickness of the sheet steel and the type of welding to use when welding the frame will impact your approach. It is generally advised to avoid cheap welders, as they may not produce quality welds and may break easily.
Before welding, it is important to plan the shape and size of the seat pan. Creating a template or using a paper template can help ensure the seat pan is the correct size and shape. The metal can then be cut and welded accordingly.
Additionally, when mounting a cafe seat pan, it is important to consider the overall design and functionality. This includes deciding on the type of seat pan, such as a fiberglass, ABS plastic, or sheet metal seat pan, and whether you want to use velcro, bolts, or other methods for attachment.
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Buying a custom-made seat
If you're looking for a custom-made seat pan for your cafe racer, there are a few options available to you. Firstly, you could consider purchasing a pre-made custom seat pan online, although these often require modifications to your bike frame and adjustments to mounting points, which can be costly and yield poorer results.
Another option is to have someone make a custom seat pan specifically for your bike. This ensures a perfect fit and the finish is exactly as you want it. You can find individuals or businesses offering this service through online forums and communities dedicated to cafe racer-style bikes. These custom fabricators can work with various materials, including metal, fibreglass, and leather, to create a seat pan that meets your specific requirements.
When commissioning a custom-made seat pan, you can choose the materials, design, and finish to suit your preferences and the style of your bike. For example, you might opt for a flat piece of stainless sheet metal for the pan, which can be wrapped in leather and held in place with rivets. Alternatively, you could use contact cement for a smoother finish.
To ensure a snug fit against the tank, you may need to extend the seat pan by cutting and welding a piece of sheet metal that rises vertically. This can be done in conjunction with shaping the foam to achieve the desired contour. When it comes to the foam itself, there are various options to consider, including high-density seat foam, outdoor upholstery foam, and closed-cell foam, which is commonly used in modern motorcycle seats for its waterproof properties.
Whether you decide to purchase a pre-made custom seat pan or commission a one-of-a-kind creation, careful consideration of your bike's measurements, your desired materials, and the overall aesthetic you wish to achieve will ensure a seat pan that perfectly complements your cafe racer.
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Frequently asked questions
It is important to prepare the seat pan by sanding it so that it can be fixed to the bike. You can then cut out some foam and shape your seat using a rasp file and contact adhesive. You should also consider the electrics tray and where it will mount or be welded in.
You can use bolts, nuts, machine screws, or industrial velcro to mount a cafe seat pan. Some people also use magnets to keep the seat from sliding around.
You can use clamps to mount the seat pan to the frame without welding. You can also use existing fixings in the seat area and drill holes for bolts, lock nuts, and thread glue.
You can reinforce a cafe seat pan by using multiple layers of mat or fibreglass. You can also use a base of aluminium plate or a plastic cutting board.
