I am restoring a Honda SS50 1977 and I need some help!
First question, what are the correct wheel sizes for this bike?
I have a front wheel with 2.50 - 18 tyre (no markings on the rim) and on the rear I have 2.50-17 tyre on a 17x1.4 rim.
At a guess, the front rim should be a 17x1.4 same as the rear?
The front rim is pitted and the spokes could do with replacing anyway.
Next question, the bike currently has a Honda cub 90cc engine (HA02E - electric start, 12v) fitted.
I have the Honda 50cc engine as was originally fitted to the bike.
The 90 engine has a neutral, down 1st, down 2nd, down 3rd, down neutral rotary gearbox.
I am assuming the the 50 has a neutral, down 1st, up 2nd, up 3rd, up 4th gearbox.
Can I swop the gearbox from the 50 into the 90 engine?
I have a friend that has worked on a few of these cub engines and is happy to tackle the gearbox. Just need some pointers as to what is possible.
Thanks for any help!