50cc inline twin 2 stroke

[Will'smotobikes19]

Nice bikes! What kind of engines are those? are they separate engines coupled? the one bike seems to be an opposed twin.

 

[Driver James]

I've been looking into this for years...

I've also wanted to see if I could somehow make a 7-rotor wankel from hobby engines. They rev to 9,000rpm and make a shade over 1hp from 0.4 cubic inches.

I also wanted to build a 4 stroke 5-cylinder inline... just to get that Audi 5-pot scream that sounds like a V10 above 8 or 9,000rpm.

 

[JerboaJohn]

major hurdles for a v twin start with a wide crank. already as wide as a predator and heavy. so cool the r/c engines but they are made for 20k+ rpm and only enough torque to push a 10lb buggy or plane.
can be done but it has to be purpose built for a bike frame,, I think abt sometimes but even if I wrote off the cost to my corp, we'd have 6k in tooling and material to cast 10 motors. sell n break even 10 units @ $600 each? who'd pay that. sell 100@ $400. not possible for such a small market. only a hobbyist can do it n make 1 or a small handful of em.
cheap n easy is inline 2 CGs but they'd be just a double CG lol. maybe some way to graft 2 saw motors in a V if you get a crank you can work with

 

[Will'smotobikes19]

Hollanderen is building a 4 cylinder 2 stroke like 900cc for a snowmobile it’s deffinetly possible.

 

[darwin]

Yamaha 250 is a v twin, their starter street bike.