Tecumseh Crank 5/8 and 3/4 Mini bike specific motor ?

[PAPSTISY]

I have 2 H35 both within two years apart. Both came off actual mini bikes. true mini motors. both small size bikes. One has a 5/8 crank other 3/4. I have several other small H motors and HS that are also mini bike motors, all have 3/4. Was it a cost thing with bike manufactures when ordering motors from Tecumseh?
Also, am I correct to say a 3/4 in the mini world is/was more desirable.

 

[markus]

5/8" shafts were very common use on the small frame H engines pre 1970, most of them weren't drilled and tapped either. some companies such as Rupp continued to use the 5/8 shaft into the 1970's as well on all the non TC driven bikes they offered, such as the Sprint, bandit, chopper, and rascal.

 

[PAPSTISY]

The 5/8 motor is an 83 Tec that came off not sure what it is? That's not me or my bike. Notice the motor he used to replace the mini motor. He wanted more power so he removed the H35. Big guy so I can kinda see why. But if it were me I would have kept the H35 regardless. But I like this kinda stuff.

So you can now say they were on these model bikes in the early 80's.



What is the name of this bike? So I know for the future?

 

[capguncowboy]

Looks like a Efenel Grand Prix with Manco wheels

 

[PAPSTISY]

cool!