Help identify make/model of 2-Stroke engine

[Peter Charles]

Hi I'm new to this forum and would appreciate any help. I recently purchase a motorised bike which I am in the process of restoring, but can't find any information regarding the bike frame or motor, manufacturer etc.
Details are as follows:
Make: Fusin Bike
Motor: Rear wheel mounted 2-Stroke with direct drive to wheel.
Brakes: Disc front, Rim rear
Frame is stamped: FM 15 - 7197
Motor stamped: FM - 02249
Head Cylinder stamped: FM 12 - 2125
Motor marked "Made in Italy".
Wheels are 20"
The bike is is in good overall condition, but has some surface rust on on chrome and frame.
Motor will need possible a re-bore and new piston.
I've attached some photos and and would appreciate any information, particularly regarding the motor.
Thanks

 

[darwin]

Can you post a picture of the rear dropouts and how that motor possibly attaches to the frame? Only history on Fusin bikes I come up with are folding bikes and regular BMX style bikes. Is there a VIN at all or serial number on the bottom of the bottom bracket, steering head or rear drop outs?

 

[Greg58]

I’m signing on to watch this one, I don’t see room for a reed valve so it must be a rotary valve. Interesting looking engine.

 

[Chainlube]

I’m signing on to watch this one, I don’t see room for a reed valve so it must be a rotary valve. Interesting looking engine.

Not sure what you're talking about there, Italian made case induction 2t with pumper carb. No kind of valve is needed.

OP said direct drive to rear wheel.

Probably chrome plated inside the cylinder, so honing or boring is just going to wreck it. Besides, it's probably perfect inside.

 

[ImpulseRocket]

I’m signing on to watch this one, I don’t see room for a reed valve so it must be a rotary valve. Interesting looking engine.

There could easily be a reed valve in the block behind the intake. I have seen some pretty shallow reed valves before. It would be a.tight fit for sure l, but not impossible.

 

[Greg58]

I was thinking of blow back through the carb if it didn’t have a reed or rotary valve, I’ve never seen a engine like this so I have no clue.

 

[Chainlube]

I was thinking of blow back through the carb if it didn’t have a reed or rotary valve, I’ve never seen a engine like this so I have no clue.

There is a possibility for a reed though, CAG and outboards use them, they're just a flapper attached inside the manifold, no case or stuffer.

 

[Chainlube]

There is a possibility for a reed though, CAG and outboards use them, they're just a flapper attached inside the manifold, no case or stuffer.

I should add, as long as they are case inducted.

 

[Peter Charles]

Thank you everyone who has commented on my query. I have had another look and have located a serial number which was stamped on the steering head (number CT6100239). I still can't find much about Fusin Bikes other than a folding bike.
I've taken a couple of more photos, see attached, which may help identify the engine manufacture. The pull start cover states Made in Italy.
Thank you again for your help.
Peter

 

[Peter Charles]

Oops I attached photos already posted. I have attached a couple more photos which show motor attached to rear wheel. (not properly attached as I had pulled the bike apart for restoration).