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Discussion Starter #1 (Edited)
I just a 02 f4i that was in a VERY hard accident and just got it running. I took the spark plugs out and its looks like theres oil all over them. Last summer my firend put 2 much oil in his bike, did a wheelie and must of threw oil through-out his motor n air box, he cleaned his air box out and rode then about 3 hours later his motor blew. Thinks he hydro-locked it. Is there any way to make sure that wont happen short of tearing the motor apart?
 

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Take all the plugs out and turn it over till all the oil comes out. You need to find out why the oil is there. Was it on it's side for a long time?
 

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Discussion Starter #3
Take all the plugs out and turn it over till all the oil comes out. You need to find out why the oil is there. Was it on it's side for a long time?

I dont think it was on its side but maybe, Its been sitting wrecked in the dudes garage for all most 9 months he said. The front was hit really hard so im affraid the oil rushed forward and maybe got into the valves, will turning it over with out the plugs get it out from the valves?
 

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The valves have seals on them. Maybe I'm not understanding what you are saying. Oil is canstantly sitting on the valve stems in the head. The seals stop it from getting into the cylinders. Maybe the seals are going bad from sitting? Maybe the oil has just run down the valves over time. A wreck shouldn't cause oil to rush forward into the valves. Turning over the engine, and maybe putting a little gas directly in the cylinders (not a lot) to help brake down the oil and extract it. Throw in some new plugs and see. If it gets so much oil in the cylinders it locks up, then that engine was screwed no matter what.
 

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If the engine is inverted so the oil runs out the breather into the airbox it can then run through the throttle bodies and into the cylinders. That's about the only way to get enough oil in there to cause problems.
Pulling the plugs and cranking it over should clear it out fine.
 

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Oh and I am betting your buddy was doing these really long standup wheelies and just ran it dry. The bike is not designed to do that as things drain down not sideways. Sounds like a stunter crowd so be careful what habits you pick up from them.
 

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Discussion Starter #7
The valves have seals on them. Maybe I'm not understanding what you are saying. Oil is canstantly sitting on the valve stems in the head. The seals stop it from getting into the cylinders. Maybe the seals are going bad from sitting? Maybe the oil has just run down the valves over time. A wreck shouldn't cause oil to rush forward into the valves. Turning over the engine, and maybe putting a little gas directly in the cylinders (not a lot) to help brake down the oil and extract it. Throw in some new plugs and see. If it gets so much oil in the cylinders it locks up, then that engine was screwed no matter what.
I cant remember exactly what he said( im not very familar with motors) but i thought he said oil made it passed the seals since it all rushed forward at once and got traped in the valve or cylinder or something( somewhere it shouldn't be), then built up pressure and it put his rod threw the motor. Maybe im just making 2 much of it , this must not be a common thing. Im just gona do what u said n take the plugs out n turn it over n roll. Thanks 4 ur help. :thumb:
 

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I cant remember exactly what he said( im not very familar with motors) but i thought he said oil made it passed the seals since it all rushed forward at once and got traped in the valve or cylinder or something( somewhere it shouldn't be), then built up pressure and it put his rod threw the motor. Maybe im just making 2 much of it , this must not be a common thing. Im just gona do what u said n take the plugs out n turn it over n roll. Thanks 4 ur help. :thumb:
Are sure it was oil and not coolant?
It's much more common to hydraulic lock a cylinder with coolant due to a cracked head or blown head gasket. It's difficult to get that much oil into a cylinder.
 

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Discussion Starter #10
Are sure it was oil and not coolant?
It's much more common to hydraulic lock a cylinder with coolant due to a cracked head or blown head gasket. It's difficult to get that much oil into a cylinder.
it was oil, his air box was completely filled with oil and he even had oil dripping out his pipe
 

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Maybe the oil rushed into the airbox through the pcv. Very odd for that to happen, who knows.
That would be the crankcase breather I mentioned earlier. Some older bikes are prone to sucking oil through there during long wheelies but probably the most common cause is the bike being inverted in a crash. A blown head gasket can fill a cylinder with oil but not via the airbox. A broken ring can pressurise the crankcase and force oil into the airbox as well.
 

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