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Yamaha DT 125 2003 blockages: narrowing in the diffuser, narrowed exhaust swirler, module, additional element between the carburettor and the air filter, narrowing under the seat above the air filter, it would be a good idea to replace the jets in the carburettor due to the change in the composition of the fuel-air mixture. change of the hose connection between the cylinder and the carburettor.