secsy1 Posted 1 hour ago Report Share Posted 1 hour ago In Poland apparently they use R500 engines that are restricted to 250cc to save costs as the engine is then unrestricted and used as a 500cc. Can anyone elaborate on this and how specifically the engines are restricted? Quote Link to comment Share on other sites More sharing options...
phillwhitewasmad Posted 9 minutes ago Report Share Posted 9 minutes ago 54 minutes ago, secsy1 said: In Poland apparently they use R500 engines that are restricted to 250cc to save costs as the engine is then unrestricted and used as a 500cc. Can anyone elaborate on this and how specifically the engines are restricted? Its through an insert in the carb and inlet manifold to reduce the fuel flow from 34mm down to about 28 or there abouts it is becoming a class in the uk next year Quote Link to comment Share on other sites More sharing options...
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