Stage 1 Tuning Air Filter Conversion Kit SR50/SR80
Print Profile(1)
Bill of Materials
- Linsenblechschraube 2,9x16 x 11:
- Malossi Red Sponge Filtermatte x 1:
Description
Simson SR50 / SR80 High-Flow Air Filter Set Stage 1
(Mikuni VM20 / VM24) (Further stages and BVF adapters will follow!!)
Description
This 3D print set is the solution for all SR50/SR80 riders who are converting to Mikuni VM20 or VM24 carburetors. The original intake path is far too restrictive for these carburetor sizes. My design optimizes the entire volume of the airbox to provide the engine with the necessary air volume for perfect performance.
Features & Compatibility
- Optimized for Mikuni: Specifically designed for use with Mikuni VM20 and VM24 carburetors.
- Maximum throughput: Ideal for tuning cylinders (e.g., 60cc, 70cc, 85cc+) that require stable air supply.
- Stable mixture formation: Prevents "over-fueling" at high RPMs due to insufficient air.
Important Installation Notes (Modification required)
This set is not a mere "spare part" but a conversion kit. For installation, the following work on the original air filter housing is absolutely necessary
Print Recommendations & Material Selection
The correct material selection is crucial for the longevity and function of the set. Since the parts are exposed to fuel vapors, vibrations, and engine heat, I recommend the following configuration:
- Main Housing / Adapter Plates:
- Material: ASA or PETG (due to fuel and heat resistance).
- Wall lines: At least 4 layers for absolute airtightness.
- Do not use PLA, as it softens with engine heat!
Carburetor Flange (Connecting sleeve):
- Material: TPU
- Important: The flange must be printed from flexible TPU. This is the only way to ensure a vibration-decoupled and 100% sealed connection to the Mikuni VM20/24.
- Advantage: The TPU seals directly at the carburetor without an additional rubber sleeve and is resistant to vibrations that could otherwise lead to cracks in the material.
Legal Notice: This conversion invalidates the operating license according to StVZO. Only suitable for racing or show purposes. The carburetor (main jet) must be re-tuned after installation.
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Documentation (1)
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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