June 17, 200917 yr 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, 200917 yr by skippy1234
June 17, 200917 yr Check if yours is 428 or 520 chain & sprockets. This could account for the differance in no of teeth.
June 17, 200917 yr Author 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
June 17, 200917 yr 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
June 17, 200917 yr Author 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
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