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Hello, so i have a ktm duke 125cc 2012, after replacing the piston and cleaning up valves etc, i collected the bike in order and connected the wires just as it was before and after starting it and driving i noticed a loss off power and a dark humbling tone ish coming from the exhaust, like it’s missing something, i really need hell i can’t figure it out, everything was fine just before it, i have a new oil filter, new fuel filter, fresh fuel, new air filter, but keep in mind, i was empty off the 10w-40 oil we use in it that we have to so we put in a thicker oil (10w-30) that was supposed to go on a volkswagen or something and yes the oil was new, could that be the issue? Too thick oil? Please help, thanks
 

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It’s very difficult to say what might be wrong without seeing the bike, as you’ve had the engine apart it could be a number of things.
The timing could be out, would be my suggestion.
Using a different oil grade won’t make any difference, in fact 10w/30 is a lighter or thinner grade than 10w/40.
 
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