I just changed the oils and ended up filling it too much. The oil level is about 5mm over the top marker. Should I drain the excess oil out or just let it be? What happens if I leave it there? Will it mess up the engine operation? Or spill the excess oil out somehow?
You are better with a slightly low oil level than with a slightly high one.
To reduce the oil level, just loosen the oil drain plug (over a pan), and by hand slowly turn the plug until oil leaks out. watch the oil level, and only drain as much as is needed.
High oil levels will cause the crankshaft, connecting rods, and transmission gears to pick up more oil and sling it around in the sump and bottom end of the engine - called windage. Windage will cause the oil to foam and aerate it as it picks up air in the foam. Excessive oil on the bore walls is more work on the oil rings, and can build up on the piston skirts and bottoms.
All of this increases pumping losses, reduces power, and can also cause blown oil seals on the crankcase.
Typical well-documented failure associated with overfilling Triumph Triples is it will blow out the output shaft oil seal (behind primary sprocket).
Remove the excess oil before you run & find it gets to that stage!
If you find a small drip from the bottom of the sprocket cover, too late!
Raising this one from the dead. :dslap: So I might have done this considering i know have an oil leak after a oil change. I have a 00. And looks like its coming from the crank case over on the left. Not positive on the name of the cover so ill post a picture.
Dipstick fully in, stand bike up to normal riding position, check dipstick.
You don't need to prop it up, just as long as you stand the bike up for a second. (This might sound like stating the obvious, but I have seen a guy trying to check the dipstick while he was sitting on the bike. "How else can I check the level" was his brainstorm of an answer?) :violent1: