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For some cilinderskits you'll need a bigger carburator and you'll need to give the engine more oil.
You can do this two ways:
Buy a oilpump with bigger output.
Mix extra oil in the gasoline.
If you don't know how to assemble these parts I advise you to ask someone that know how to.

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This is the Polini 68cc Cilinderkit. It's one of the fastest cilinders. It has a special "W" exhaust-outlet. This cilinder works very well with a fast exhaust. You can get about 12.5 PS out of this cilinder with a 19mm Dell'orto carburator and a fast exhaust.
Costs:
250 dollar without a cilinderhead
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The 75cc Racingkit from Topperformances with a compression of 14:1
Costs:
299 dollar
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The Topperformances 73,5cc (49mm) cilinderkit. I've got It now for almost a year and it rides very well. It's a very strong cilinder.
Costs:
200 dollar for a cilinderkit with a cilinderhead
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EUROKIT

The Eurokit fast-50cc Cilinderkit
Costs:
200 dollar for a cilinderkit and cilinderhead
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EUROKIT

The Eurokit 70cc (48mm) Cilinderkit
Costs:
200 dollar for a cilinderkit and cilinderhead
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