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It keeps saying "The bottom end part is reducing MTBF as it reaches its max RPM". I've tried everything but still cant figure it out. Can someone tell what it means?

Some of your materials in the first section of the engine design are made on the cheap but can also limit the number of max RPMs. To reduce this, look at some of the description of parts in the "bottom end." They will tell you how good they are in terms of rpm. Also, try lowering your rpm.

Thanks. That helps a ton.

Also, lowering the stroke of the engine can help it withstand higher RPM with the same parts and quality. Obviously you have to sacrifice engine capacity to do this

If you switch test modes you can see the stresses on different components.

Oh. Its most likely the sttoke.., i tend to raise the stroke when i start a engine