You can install the kit with a 44mm racing crankshaft and 85 connecting rod without the thickness, so you will have an exact displacement of 86cc. To obtain a displacement of 88cc it will be necessary to use a 45mm crankshaft stroke with 90mm connecting rod and use the base included in the kit. Attention: For assembly with 88cc displacement it is absolutely necessary to use longer prisoners (M7x120mm), Depending on the year of production of the engine it may be necessary to do machining to the crankcase for the passage of the connecting rod.