Screws on the engine aren’t loose the factory uses good tightening specs to keep all seals well under pressure to insure long life if you tighten too much you may cause the seals to flatten out and create bubbles where oil may degrade it and escape by pressure build up second over tightening screws will lead to thread damage and unseen cracks in the engine block follow specs to insure warranty doesn’t get voided in case you want SUZUKI to still accept your bike