lost of power in Cylinder after 10 min at 100km/hr

The carbs may need to be cleaned if the filter is not very fine? I recently found dust in my carbs that had passed through the filter.
 
If the fuel hose is very old it can deteriorate and flake off etc. I would change the lines if there is any suspicion of them being old. It's a cheap project so if it doesn't fix it, it certainly didnt hurt it.
 
I think I found the problem
 

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Also I just figured out this bike was converted to a ignition unit so no points on it. If that changes anything.
 
My only "breakdowns" were from rust in the tank prior to cleaning it well. Would happen after a few minutes at highway speeds.
 
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