Chopped off top tube build and it works!

[rocksalt27]

I told yall I was gonna do it!

And yes, ugh, I'm going to reinforce the frame.

 

[Larry Trotter]

What bike is that?

 

[rocksalt27]

It's a BCA 20 inch

 

[Larry Trotter]

I really like it. I hav a new in the box 60cc kit that would look perfect on that.

 

[rocksalt27]

I got a 49cc on there. By the way be careful with the real short intakes. They dont sit all the way in the carb tube and you'll have a huge vacuum leak. I had that and it didn't have any power at all. Barely ran at full throttle. Some tape will fix that though.

 

[Larry Trotter]

Did you start with a girls or boys bike?

 

[rocksalt27]

It's not either really, it's just a small frame. The only thing that makes it a "girls" bike is if it is a step thru frame. Otherwise there's really no such thing as a boys or girls bike.

 

[Larry Trotter]

It's not either really, it's just a small frame. The only thing that makes it a "girls" bike is if it is a step thru frame. Otherwise there's really no such thing as a boys or girls bike.

 

[Larry Trotter]

I liked it so much I just started a 20 inch. Schwinn wit a bent bottom tube so the motor sits lower. I just have to extend the seat tube up and put a straight bar on top. Probably won’t leave it pink.

 

[Tony01]

Problem with thread titles like this is people usually don’t survive or care to update the thread when their mod fails...

 

[Larry Trotter]

I would like to know what problems the op ran across to avoid them but so far on mine I don’t see any show stoppers. I do have a 32 tooth rear sprocket on the way to compensate for the 20 inch wheel.

 

[Larry Trotter]

One thing that helped a lot to get the motor lower was to remove about Hal the thickness of the slip on rear mount casting. This got the motor nearly 2 inches lower.

 

[rocksalt27]

Hey all-just seeing these replies! Glad I inspired you to try one yourself, Larry! That frame looks nice and beefy like mine. I think you'll be OK. As for the skeptics-I've been riding it to work everyday for 2 weeks. It's been real comfortable with the low height and backrest. The only issue was the torque. It really didn't like low speeds with such small wheels and sprocket. So I pulled the muffler cap and problem solved.

Anyway, no breakdowns, and no...it hasn't collapsed.

She says, "ssh"
-Bowie

 

[Larry Trotter]

Mine is going very well also. I did quite a bit of work on the front and rear mounts to move the motor much lower in the frame. I am going to add a top bar to mount the tank and stiffen it up some. More pictures later of the mods.

 

[JerryAssburger]

This is a fascinating thread! How many of us have a bunch of 20" bicycles that the kids and grandkids have out-grown, just waiting for a project like this? The funny thing is, the China-Girl looks to be "the right size" on these frames!

 

[curtisfox]

Would be kool if you would of taken the top bar with the curve put it in place of the bottom bar. Be a nice curve for the motor to set down.............Curt

 

[rocksalt27]

Glad I inspired everyone else here! I wanted something lower like a minibike for myself. But now we can learn the kids how to ride with us too!