My build. Frankenstein.

Not trying to be smart here, but my feeling is that anyone on a motorized bicycle doing more than 20 MPH and/ riding in traffic should probably have a motorcycle licence?
 
I also think the 160 is a good choice for your build, don't know if you will be able to convince anyone it's 50cc though.
 
Dude get the Honda GC 160 QHA-1 and find out how fun it is, You'll be a happy Camper look for them on line and you'll find out if you can have em in Poland better yet find someone with a gas powered washer and see what engine it is probably a Honda.
 
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GX 160 is 5.5 HP, But if you play with it a little, your likely to get a bit more.
KTM is apparently 9HP, But at 10 000 RPM, With very little low down torque in comparison.
It's like the difference between an old V8 and a late model Turbo 4 cyl.
The Turbo might have more HP on paper, But you have to ring it's neck to get said HP.
I like old V8's, the way you can idle around in them, and tromp it in any gear, not have to shift down.
I've never done a 4 stroke build but have a GX160 here, however don't have the right frame to put it in.
 
I think the first thing over all I have to do is to see how actually big the frame is.
I havent seen the bike in real life and wont until June. I have been just buying parts and the friend putting it together.
I really like naked 4 strokes that have been seeing Wolf creative customs using.
Think the best bike for me would be actually a 4 stroke, but 2 stroke sounds to be more fun.

What do you think of this?

http://www.arrowmotorizedcycles.com/motorized-bicycle-engines.html

 
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Your build looks great and capable. The forks are great and as long as you adjust the slack out of the springs with your weight on them, they'll be nice and solid for the speed you're looking at.
 
I have a hard time with such an elegant machine being called a 'Frankenstein'... essentially, ALL of us are putting motors where (according to some) they do NOT belong... therefore, ALL of our creations are 'Frankensteins' to SOME degree or another... but THIS machine has a certain class, it is graceful, pleasant to the eyes.
Well done, Sir... well done!!
 
Slip one of these in that frame:

Franco Morini with variator

Have the best of both worlds. High performance 2 stroke with a decent clutch & variator as well.

My biggest gripe with the KTM clones has been the clutch. Only cure seems to be a $285 Tomar clutch.
 
Dave Rust over at arrow builds some nice engines. I had one of his 4.5 street racer engines on one of my builds....thing was a beast!!
 
In Poland, you are probably closer to Puch and Hercules engines. If the worst comes to the worst, there's always Tomos. That's a lot of worst.
 
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