The 125cc models of Leader engines do not have a decompression device. If such an engine is converted to a larger cylinder, the starter is often without a chance.

Our decompression kits are a fine thing to relieve the durability and the toothing of the crankshaft significantly.
This spring is a part of the set, or standard in all Leader and Quasar engines above 125cc.


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OEM numbers (for comparison purposes only)
Piaggio:
486974, AP8580100
Aprilia:
AP8580100
Scooter Center:
7670203