Need an advice on an observation on 125 lately. It just did 3000km and I've changed the oil as recommended. Recently, I got the tuning done at 3000km and I feel like something has gone wrong. I don't get the max speed, I feel it has gone underpowered. And most importantly, it has started making firing noise while releasing accelerator from high rpm or sudden acceleration. I first got it'd spark checked, it was ok but I replaced it just to identify the anomaly. Although, the firing noise did subside but its still there.
Can some guru tell me what to look for? Why the top speed has failed to cross over 85kph? Why there is a firing noise ?
And yes, Ive clearly noted that mileage as reduced drastically. Previously it use to do 42-43 in early stages. Now, probably after tuning, it has gone down to dogs. Around 35 perhaps.
Can someone shed some light on it plz ?