"Dhampir" motorized bicycle project

Good day to all! For a long time I wanted to post my topic on this forum.

First, by the name of this monster. What is a dhampir? We open google and find something like this: "Dhampir is half human, half vampire." Dampires is generally portrayed as one with all or most powers of a vampire, with few to no disadvantages."
If it is easier, then the concept of this bike is simple. Ideally, it should take the best from both kinds of transport and, if possible, not have their disadvantages. From bicycle - size, weight and the ability to ride pedals. From a light motorcycle - the dynamics of acceleration and cruising speed. All this - with weight and dimensions, under which it can be stored in the apartment. Of course, because is a single-speed engine, the ideal "balance" between "bicycling" and "motorcycling" is impossible. With a big rear sprocket we get a lot of traction, but a small speed. With the small rear sprocket - a high speed, but much less acceleration dynamics.

And therefore, in more detail on the engine. It is a two-stroke water cooling engine from ktm sx 50 dirt bike. A resonator tuve was welded now. And rotor of the water pump is made on the CNC. For the engine were purchased two radiators from KTM SX 65 and 19mm Dellorto PHBG carburetor.

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The frame of this bike was welded from a thick-walled steel profile. Main part (top, down and seat tubes) - from 50x50x3mm square tube, and for chain and seat stays - 40x20x2mm tube. Weight of a complete frame is 16kg. Weight of a complete bike is 56kg.

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The head tube, the bottom bracket shell and top of the seat tube is made from steel on a lathe. Saddle - lepper primus.

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Before the opening of the new season, I decided to replace some elements. New pedals and a brake rotor were installed. It is also planned to install a smaller driving sprocket for maximum traction. Now there is a sprocket on 11 teeth, it is planned to install a sprocket on 9 or 10 teeth. This will give the ultimate traction.

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I decided to replace the сhinese clutch with the original one. I believe that with proper clutch configuration, the acceleration of the bike will be better. Bought a original clutch rotor and pads. I had to order all the clutch assembly, because the base on which the pads were attached was also wrong.
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Hello all! This season is over without incident. But at the end of the season I decided to order a new resonance pipe. It was obvious that the engine did not produce rated power. As a result, a custom resonant pipe of the correct configuration was manufactured from stainless steel 1mm. Weight is about a kilogram (4kg for an old pipe). With this pipe, the bike rides like a real dirt bike! The video will be later, it is raining now.

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This is one of the top 10 builds I have seen on this forum, the other one, facebook groups and random places. I wish you lived in america so you could join the races.
 
Hello all! This season is over without incident. But at the end of the season I decided to order a new resonance pipe. It was obvious that the engine did not produce rated power. As a result, a custom resonant pipe of the correct configuration was manufactured from stainless steel 1mm. Weight is about a kilogram (4kg for an old pipe). With this pipe, the bike rides like a real dirt bike! The video will be later, it is raining now.

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Proper pipe makes ALL the difference on a 2stroke!!!
 
The only thing wrong with this bike is it doesn’t belong to me! When it hits the pipe it sounds like a YZ125, all that’s needed is a shift kit. Best I’ve seen yet. ⭐⭐⭐⭐⭐
 
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