Posts
27442
Joined
7/22/2007
Location
St Helens, OR
US
Edited Date/Time
8/8/2015 12:10pm
What I have going on here , was an issue with my clutch at first. Which turned out NOT to be an issue because of something so simple I over looked it. I couldn't have any slop in my clutch lever because the other end of the cable ( in the stater side , small lever ) had the tab broke off , which is basically a keeper. I'm getting a new little lever here real quick. As of right now , that little issue is solved.
My main issue is , when I went to drain my oil so I could check my clutch plates , basket and so forth , I barely had anything in there. Like 2 - 3oz of oil. About a 1/2 cup or less?
I checked the plug , and it's clean and was burning clean , motor was running like a Swiss watch. No oil coming from any gaskets , drain plug , ect. I do however have a heavy residue on one ( there are two ) vent hoses coming out of my power valve. I have no oil in the water , so that tells me the water pump seal is still good.
What could it be? Maybe a bad seal in the power valve area of some type?
I usually do two full ride days before I change my oil. The last few times I've done this , the oil was still clean and good. I got two full ride days on this oil change , but it was pretty burned and not much left.
I am going to slap some fresh oil in it and test ride it this weekend and see if I can pin point exactly where it's coming out of. Any other RM owners come across an issue like this?
My main issue is , when I went to drain my oil so I could check my clutch plates , basket and so forth , I barely had anything in there. Like 2 - 3oz of oil. About a 1/2 cup or less?
I checked the plug , and it's clean and was burning clean , motor was running like a Swiss watch. No oil coming from any gaskets , drain plug , ect. I do however have a heavy residue on one ( there are two ) vent hoses coming out of my power valve. I have no oil in the water , so that tells me the water pump seal is still good.
What could it be? Maybe a bad seal in the power valve area of some type?
I usually do two full ride days before I change my oil. The last few times I've done this , the oil was still clean and good. I got two full ride days on this oil change , but it was pretty burned and not much left.
I am going to slap some fresh oil in it and test ride it this weekend and see if I can pin point exactly where it's coming out of. Any other RM owners come across an issue like this?
bike seems to be running great, fresh topend, no water leaks, %100 clean radiator water, not smoking..
I kid, I kid...
I change the gearbox oil every ride on both my YZ250s and my YZ125 because the wet clutch just gunks it up so quickly. How long was it between the last oil change and when it was all gone?
My bet is that your main seal is NFG (No Fuckin' Good). The seal and a clutch cover gasket are cheap... I would start there.
2B, yours sounds like the same issue to me, the main seal. The power valve vent tube is there to equalize pressure in the power valve linkage chamber on the front of the cylinder. The power valves don't have any kind of sealing rings or O-rings, so they actually allow a bit of un-burned premix oil to pass between them and the cylinder casting. That is by design, how else would they stay lubed and cooled? So that oil on the vent-tube is just premix oil from your fuel, not oil from the transmission.
On a two-stroke, if your transmission isn't leaking oil out the case or the tranny-vent-tube, it's being picked up through the main seals, or the thin section of sealant that separates the crank from the gearbox. The crank-seal is the most likely problem.
I popped a crank seal at StarWest MX one day when I started the bike with the exhaust plug still installed. It was bogging and sounded loaded-up so I revved it to clear it out. DOHHH! Big mistake. When I pulled out the silencer plug it smoked like Barcia's old CRF250R practice bike... A new seal fixed the problem.
I run the oil in my 2014 250SX for roughly 2 hours before changing it. Because I am an engineering nerd, I got a kit from Blackstone to send an oil sample off and see exactly what's in it.
The bad main seal could be a possibility for sure. Only thing is , the plug and exhaust are clean and the bike wasn't smoking at all during my rides. There is no oil coming out from the drain bolt or any gasket on the motor. And for some reason the PV vent tube was coated with oil , like was more than normal.
The Shop
If not, the bike is burning oil through the cylinder. That means crank seals or center gasket. It could be leaking slow enough that it's burning with the combustion and not enough to gunk the plug up.
Might as well through a new ring in it while you have the chance!
If you are checking the clutch plates regularly, you will notice wear before it becomes an issue. Even if it does go after some time, an OEM inner is relatively inexpensive.
Post a reply to: RM 250 issue. Missing 95% of my tranny oil?