Well when Honda 1st Introduced C70 in the market ( we are still using same c70 engine with just CDI added to it) the people were saying bcoz the bike have such a high revolution engine it wont be reliable but Honda proved em wrong the reason behind this was the c70 engine which is a small engine but very reliable and long lasting. it produces more power bcoz of this high revolutions..
Now if u consider this that a 70cc honda CD 70 gives u around 8 HP which isnt bad.. Most 100c bikes give around 9 BHP or 10 Max...
Good Resale
Cheap Parts
Easy Maintenance
Very Very Reliable hardly breaks down
Its not for Racing so an avg speed of 60 to 65kmph u can easily do that on 70 which is a good enough speed considering a avg speed of cars in city is not more then 75....... with cd 70 abover 70kmph is tough for the small engine... this is where the cd loses its power even if u push the accelerator to full it will still go above that but very slowly.
Goin up to 70kmph no problem....
U want more power go for Sprinter/ Junoon/ Gs 125/ Or CG 125...