nwestty80 Posted February 3, 2014 Report Share Posted February 3, 2014 ive been on the phone to yamaha and gave them my matching frame and engine numbers 451-1001** and they tell me that the bike is a 1975 ty80b.Thats all well and good but the bike has 5 gears in a one down four up config.Now yamaha tell me it should be a standard 4 speed as the 5 speed didnt come out until late 70's.Could the gears have been modified or could there be a problem with the gears thats making it look like a five speed.Its definitely 1 down and 4 up with neutral a half click up from bottom.Not sure if ive bought a rogue bike but frame and engine number all match and look genuine.All seems a bit strange and would welcome any advice.thanks. Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 4, 2014 Report Share Posted February 4, 2014 A standard was a four speed. It has been a lot of years and no telling what has been done during that time. You should just be lucky. Quote Link to comment Share on other sites More sharing options...
baldilocks Posted February 4, 2014 Report Share Posted February 4, 2014 Its a long time ago but I think it should be four speed with neutral below first not between first and second. it may have a ty50 gear cluster fitted as the crankcases look similar. Quote Link to comment Share on other sites More sharing options...
axulsuv Posted February 4, 2014 Report Share Posted February 4, 2014 All the small wheeled ty80's were 4 speeds , As stated above may have a ty50 gearset in the 80 case ? Quote Link to comment Share on other sites More sharing options...
rsvscott Posted February 4, 2014 Report Share Posted February 4, 2014 My first TY80 had the 5 speed box from the TY50 fitted. I am sure that we were told it shortens the gearing as a bit of an improvement for trials. Quote Link to comment Share on other sites More sharing options...
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