February 3, 201412 yr 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.
February 4, 201412 yr 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.
February 4, 201412 yr 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.
February 4, 201412 yr All the small wheeled ty80's were 4 speeds , As stated above may have a ty50 gearset in the 80 case ?
February 4, 201412 yr 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.
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