2000 Scrambler 500….no oil pressure

[Keroseneburner]

I bought this thing used…unknown hours or mx history…ran great for a couple of years…Junior was riding it…the engine locked up.  I pulled the cylinder and the piston has seized at the wrist pin.  Bottom end still felt smooth and tight so I replaced the piston, cylinder, wrist pin, etc. fired it up, loosened the oil filter…nothing.  I bled the pump using the vent block off method, still nothing.  Is there anything else to try or do the oil pumps fail in these things?  I hate to pull it, split the case, and figure out it was something else.  Thanks in advance!

[Mech]

If this make and model of bike has an oil filter, you could check there for oil flow, or blockage, and you could probably use an oil can and pump a little oil down there in an attempt to prime the pump, and then see if that oil comes out when it's started...

Bit you know, different makes and models all have differences.. so it's pretty hard to say.

[Keroseneburner]

I put compressed air into the oil tank….it oozed out the filter.  

[Mech]

Oh ok. Well.... 

[Keroseneburner]

I guess I am going to drain the tank, check the screen and lines…..then it must be the oil pump.  Crud

 

[Mech]

Ha. yeah Bro...

Good leaning for junior..

Get a beer and a chair and tell him how to do it.  Everyone benefits..