2 ways of tackling the rear sprocket.either buy a 28 tooth split sprocket from one of the suppliers on line and use a 12 tooth front for bayford and buckmore and a 13 tooth for lydd ,clay and the faster tracks .or try and find the sprocket carrier that takes various rear sprockets that usually came in 40 mm and bore it to 50mm.i have done both before for 50mm axle.most eco owners will be using 14 front on all the circuits .34 rear at bayford,33 at buckmore and 31 at lydd etc.the engine has an intermediate gear inside the engine thats the reason for small rear sprockets that rarely get near kerbs.i doubt if you have a 300 as most of these race in f6 and there where abouts are all known.lap times are not much quicker than rotax these days .low 38s at lydd.mid 39s at buckmore .if you need any more help just email me on [email protected]
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