In order not to exceed the displacement classes for certain racing series, Airsal offers the 78.5cc version of the Xtrem cylinder with 50mm bore using the standard 40mm stroke of the Derbi crankshaft. The cylinder kit, the exhausted timing and the Vertex piston are identical to the 88ccm. Even with 80ccm there is more than enough power available in this kit. The bore of 50mm makes it necessary to expand the crankcase to be able to insert the cylinder. Mounting instructions are supplied with the unit. The cylinder should only be used with appropriate racing exhaust systems, a 21mm carburettor should be the standard. Brachial performance, best quality and top price-performance ratio. Absolute competition for Malossi and Co. in price, processing and especially in performance.

Attention: A mounting on mopeds with Euro4 engine (from year of manufacture 2018) is only possible in connection with the thread adapter 38293, because a temperature sensor (4-pole) with M12x1,5mm thread is installed on these models.