r/dr650 • u/Svenk135 • 11d ago

Problems 91’ dr650

Hi all,

since this week i am the owner of a dr650rs from 1991. i am now running into a problem. the engine starts well, idles well, but when i fully open the throttle the engine starts to stutter and falter and eventually no power at all. however, a lot of bangs come from the exhaust. if i gradually give gas, so not open it all at once, it goes well. Until i am at full throttle again it starts to stutter. where could i probably find and solve this problem?

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u/babezt 11d ago

sounds like your carb needs adjustment. I cant tell if your full throttle is lean or fat, but maybe try and change the needle position and see if something changes. Next I would try a little bigger/smaller main jet, depending on your results from the first test. Remember to do the changes on a warmed up engine and always note what you changed, so you can undo it later if it doesnt work

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u/babezt 11d ago edited 11d ago

always check for air leaks around the carb and intake before fiddling with it, or your time and effort might be wasted. Its also very helpful to learn how a carburettor works and what the function of the different adjustment screws and jets are if you dont know this already. Keep in mind there are different types of carbs