A friend and I have almost identical 99 DR 350 SE 's . Recently , his started making a rattle that we thought meant valves needed adjusting. We noticed, however that the rattle goes away when the clutch is not engaged. Now he has an oil leak from a cap or plug on the left side of the engine (as you are sitting on the bike) .This plug has an opening almost like allen head. It appears that the leak isn't coming from the o ring but rather from the middle of the plug itself.
My question is : can the rattle and leak be related ? if so explain ... if not, has anyone encountered something similar ?
Thanks, Mike Nugent