“DESNA” WITH A MOTOR | DIY | HOBBY

For my moped, I chose a folding bicycle “Desna-2” model B-849 with reduced wheels (20 X 1.75). To install a motor on it, I made some modifications.

I reinforced the frame: I welded an L-shaped tube between the steering column and the backbone beam. I had to spring the front fork with two springs to remove or soften shocks from road irregularities. On the rear wheel hub, I installed an additional sprocket from a motorized bicycle of the 16MV brand on the left side. I modified and reinforced the rear rack, preserving its functions and somewhat expanding them: I attached a fuel tank under it, from which fuel flows by gravity through the fuel line to the K34B carburetor.

**Fig. 1. Desna bicycle with motor:**
1 — frame backbone beam, 2 — shock absorber struts, 3 — shock absorber clamp, 4 — headlight, 5 — toggle switch, 6 — frame reinforcement tube, 7 — engine, 8 — frame seat post, 9 — rack, 10 — fuel tank, 11 — extended rack struts, 12 — sprocket, 13 — chain tension sprocket, 14 — engine mounting clamp, 15 — auxiliary engine bracket tube.

The D-6 engine is mounted using auxiliary tubes and clamps on the backbone beam and seat post. To stop the engine while moving, there is a toggle switch on the right handlebar grip that breaks the primary circuit of the engine magneto. To ensure safe movement even at night, the bicycle is equipped with a front headlight (with low and high beam) and a red stop signal at the rear.

**Fig. 2. Frame reinforcement:**
1 — steering column, 2 — reinforcement tube, 3 — frame backbone beam.

**Fig. 3. Front wheel shock absorber:**
1 — strut, 2 — spring, 3 — adjustment nut, 4 — clamp, 5 — steering post.

**Fig. 4. Engine mounting:**
1 — frame seat post, 2 — frame backbone beam, 3 — clamp, 4 — muffler bracket, 5 — tubes (engine bracket), 6 — clamp, 7 — tension sprocket bracket, 8 — tension sprocket.

**Fig. 5. Fuel tank installation:**
1 — rear fork, 2 — extended rack strut, 3 — fuel tank brackets, 4 — rack, 5 — fuel tank.

The weight of the folding moped turned out to be about 30 kgf, it can be lifted and carried in folded form. For convenient storage, I made a wooden stand-cart on wheels. The machine requires little space — 100 X 50 cm.

N. PANKOV

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