I think for GS150R it should be around 3-4.5k RPM. Keep it there and your cylinder kit will be good as new for years. Anything lower is a stress on the cylinder kit even though it does not knock. Knocking only means extreme stress and serious damage. Anything above that engine will be gasping for oil.
If you are cruising or need good acceleration keep it near its peak torque region.






) is longer than other indian bikes.. as mathew pointed out , think its different from others...

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