Maintenance & Technical > KX500 Original

Mud and water in my engine :(

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oic0:
Long story short, the bike fell over in some mud and water. Me knee popped out so I couldn't stand up to get it out of it right away. It stayed half submerged for a minute. It died right away but after that I tried to start it for a while. Wouldn't start and compression felt low. Tried again today and compression was back but wouldn't start. Anywho, I decided to drain the carb to see if it had water in it. There was mud in the bottom of the drain... NOOOOOO!!!!!!!!!!

Took off the air filter, which looked clean, and there is an inch thick of mud inside the air boot.

Ive already pulled the cylinder off I just don't know what to do now :( Pipe also had at least a liter of water in it.

All ive done so far is pull it apart and pour premix in the bottom end to keep the bearings from rusting. The premix has a muddy tinge to it as it filled to the surface.... Whole thing sucks so bad it makes me sick. What do I do?


P.S. does nikasil rust? this cylinder keeps rusting in front of my eyes.

500freak:
if i was you i would pull the bottem end out. find a parts washer and flush it all out. the cylinder will pit so i would spray the hole top end with wd-40. also parts wash that too.

kaw rider:
pull the igntion cover and dry flywheel and stator. Drain gas out of carb and gas tank and install fresh gas. drain oil out of transmission and install new oil. Pull start bike with spark plug out. And then install acouple of drips on fuel down the spark plug hole. And try and start the motor and then fog the motor with oil. That what we do with jetski motor when they sink.

oic0:
What about the dirt in the bearings? have to split the cases, take crank out and find a varsol table or swish it in diesel? Ive never split cases before except on the RD which is way easier...

hughes:
The correct way to get your engine back up and running is to split the cases and clean each component in the bottom end. The crank main bearings should be flushed with cleaner along with the big end rod bearing. Clean and flush each crank case cover. Piston/rings/wrist pin/wrist pin bearing should be cleaned with contact cleaner. You may even need to remove the power valves from the cylinder and properly flush and clean the cylinder. As other as mention is make sure your carb is clean and don't over look the reed cage assembly it will need to be clean. Your bike is 2000 model right? Given the fact the engine is completely apart at this point if you can afford it maybe this would be a good time to install new main bearings, rod kit, top end, or even cylinder plating. If you?re going to reuse all the existing parts then proper cleaning is the only way to go. I don't know how many engines you have been into but I can tell you I've seen enough to ensure you that you don't want to start and run that engine unless it's been completely apart and cleaned. The dirt will shorten the life of everything in the bottom end and wear the plating on the cylinder and then you'll be taking it apart again for rebuild. Do it right the first time and I think it will save you some down time later.

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