Hey everyone,

I ride a Suzuki DR200SE year 2003. The bike was running great even at 110km/h. I replaced the carburetor because the membrane was broken, not the official Suzuki carburetor, but still the engine worked alright afterwards. Then one week later, a valve inside the cylinder broke, so the piston hit the sparkplug and got all melt. So I went to several mechanics who fixed the inner surface of the cylinder and replaced the piston and valves. That was all done by very ambitious, but not very well equipped mechanics, and I dont know about their knowledge. They had to work in nighttime with very less light, so I wouldnt wonder if something is not working properly as these two mechanics had to open and rebuild together everything under hard conditions.
So then after these fixes, I started running slowly for 500km because the piston was new.


But now as I tried to ride a little bit faster, a problem occurs:

When I go faster than around 80km/h, the engine seems to starve. It feels like there is a lack of oxygen or fuel, like the composition is wrong. It continues to "starve" down to 50km/h and needs around 10 seconds to work properly up to 80km/h again.
Also, I have to drive with an open choke, as the engine always stops running when I switch to the lower gears. I tried to close the choke when I'm riding in 5th gear at around 80km/h, but the starving problem still occurs.

I don't know much about the mechanics, as I'm very new to the world of riding.

Does anyone of you have an idea what the problem could be, or where it comes from?

Greetings,
Tobi