Oil Overfill!!

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puzzle · #1 Unread post by **puzzle** » Mon Jul 18, 2005 8:27 am

The oil window on my GPZ500S is very difficult to gauge an accurate reading from. Anyway, I topped the oil up after checking the oil level with the bike OFF the main stand and being held upright by my mate (as advised by the bike shop). Upon next taking the bike out, it would barely do 60MPH (there was no oil/smoke coming out of either exhaust can), so I turned round and headed home, a round trip of about 15 miles. As I had only topped up the oil and the bike was running fine before this, I decided to drain the oil and put some new in (this time measuring the 3.4L) is says it holds on the side of the engine. Allowing for some oil always to remain in the sump I got 3.0L in (but about 6.0L out)!! Bike now runs fine. However, will I have damaged the engine in the process? I've checked the airbox but there's no oil in there (relief) and the spark plugs are not 'gummed' up.
Thanks in anticipation.

txbadboy · #2 Unread post by **txbadboy** » Mon Jul 18, 2005 8:49 am

i dont think so. im assuming your crankcase vent routes to your airbox, as with the bies ive seen. hopefully someone else will come along and verify or correct me.

Wizzard · #3 Unread post by **Wizzard** » Mon Jul 18, 2005 9:15 am

I have found the best way to do this with oil changes , is to replace the filter as well . Get your self a large measuring cup . The kind your wife , girlfriend , or mother uses in her kitchen . The one that I have been using for years is a 2 liter and it measures in mls. pints, ozs, cups, and liters. You can get right on down to the real nitty gritty with it .
Kind regards, Wizzard

Aggroton · #4 Unread post by **Aggroton** » Mon Jul 18, 2005 10:34 am

Wizzard wrote:I have found the best way to do this with oil changes , is to replace the filter as well . Get your self a large measuring cup . The kind your wife , girlfriend , or mother uses in her kitchen . The one that I have been using for years is a 2 liter and it measures in mls. pints, ozs, cups, and liters. You can get right on down to the real nitty gritty with it .
Kind regards, Wizzard

thats the best idea ive heard yet...thanks mate.

#5 Unread post by **ZooTech** » Mon Jul 18, 2005 10:50 am

This is one of the most common ways to over-pressurize the bottom-end of an engine and blow out a seal. With that much excess oil the pistons were probably literally making contact with the oil in the pan, hence the lack of performance as it churned up the oil. If, after sorting everything out (as you have), the bike does not leak out of any blown seals, count yourself lucky and chalk it up to a momentary lapse of reason.