Bad rpm causing power loss

[wanderLost]

After replacing the engine on my 2019 TNT600i (the original one blew), i've noticed a significant loss of power at high RPMs. Before, I could cruise easily at 100-120 km/h in 4th gear at around 6k rpm , but now it takes 5th gear and 6k-7k rpm to hit the same speed. The engine also feels rough and vibrates more at higher revs, which makes me think something's off with the new setup. Thoughts?

 

[Sokka10]

Yeah, sounds like that new engine's either not tuned right or maybe geared different. Check your fueling, timing, and make sure the ECU's mapped for that setup, it could even be mounts or balance off

 

[Tvrner]

Perhaps the new engine might not be tuned or installed exactly like the original.