skippy1234 Posted June 17, 2009 Report Share Posted June 17, 2009 (edited) hi all got my 78 ty 250 twinshock running really sweet, now ive come to replacing the tyres and ive seen the rear sprocket is a 52 teeth and ive looked at new ones and they seem to be 10 teeth less it pulls up hills great as it is should i change or leave alone will it naker anything?cheers mick Edited June 17, 2009 by skippy1234 Quote Link to comment Share on other sites More sharing options...
b40rt Posted June 17, 2009 Report Share Posted June 17, 2009 Check if yours is 428 or 520 chain & sprockets. This could account for the differance in no of teeth. Quote Link to comment Share on other sites More sharing options...
skippy1234 Posted June 17, 2009 Author Report Share Posted June 17, 2009 hi its a 428 and a 53 not 52 toothed sprocket it is also on a alloy wheel wich im thinking is not original cheers Quote Link to comment Share on other sites More sharing options...
tony283 Posted June 17, 2009 Report Share Posted June 17, 2009 The 428 and 53 tooth is standard for the year along with a 13 tooth engine sprocket. Depending on your area and type of trials riding a 12 tooth engine sprocket might be an improvement and is what I fit on ALL my trials Yamahas. Tony Quote Link to comment Share on other sites More sharing options...
skippy1234 Posted June 17, 2009 Author Report Share Posted June 17, 2009 hi just checked it is a 13 tooth front i will give the 12 a go i takke it this will lower the gearing and a bit better pulling cheers mick Quote Link to comment Share on other sites More sharing options...
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