1978 Yamaha XT500 Oil in frame; Pukes oil up into intake...
At the back of the crank case there is a puck looking thing with nothing inside of it and it's connected to the bottom of the air box. It sometimes works fine and sometimes it pukes oil...Found a plugged crank case vent tube, but, no difference... Just kicking over can make it puke oil. The dipstick is up by the handle bars and the level fluxuates up and down depending on if it is puking or not. Runs good when it does run, decent compression,, can't remember the psi though..Can't find any info in the book about oil in frame system. I even took it to 4 seasons,,Guy thought it was valve guides..or rings... Is there a valve I don't know about? Is there a website that explains the principals of it's opperation? Any Ideas would be greatly appreciated.. Thanks.. Rib P.s. just ignore the xj700 maxim...
Re: 1978 Yamaha XT500 Oil in frame; Pukes oil up into...
I have resently read on-line that if the ball ck. goes bad does not seat that oil in your tank or frame in the xt-tt will leak all to the crank case.It is lockated in your cluchcover case feed going in to your fillter I hve personaly never have had this proplem it is a closed system
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check the drain hole isnt blocked with silt , poke it ! also i think your over filling the engine with oil , does it have a dip stick on the filler cap or is there a sight glass on the side of the engine case on the same side as the filler ?
was the 2.8 liter for the crank case or total system capacity, one thing you want to absoulutley avoid is over filling the crank, one thing to check is to see if oil is making its way into the crank via the oil tube, also is it a 2 or 4 stroke, 2 strokes require a oil mix for the gas not the crank and a specific ratio, unmixed gas in a 2 stroke = siezed motor,
The intake valve seals are worn or cracked, and possibly the piston rings as well. Pressure from the combustion chamber is getting back through the valves to the carb and into the air filter. It's also forcing oil up from the crank case into the carb. Have a compression test done, should isolate problem.
There are a total of three plugs. Two of them are under the engine and the other one is under the crank case. The fill hole is on the bottom left front of the motor between the frame rail coming out of the bottom left side. Remove the oil fill plug out out of the front left bottom side of the inside of the frame rail. It's a tight fit so you will need a open ended wrench.
Hi mate I have no idea what bike your referring to as no information?
But most water cooled engines would have two seals to seal the impeller shaft (which circulates the coolant) these seals usually one each side of the inside engine case where impeller goes through one of them holds oil out and the other holds water in hence they called oil and water seals
if your sure not head gasket these seals are about the only other way water can get in
I love Yamaha motocross bikes and other MX bikes as they have a specially purpose built hole in the water pump area so when you see it seeping coolant out it tells you straight away needs new oil and water seals
if it is this seal usually only one or the other has gone but no one would replace one with out the other you will see what I mean if you ever replace them as is complete pain just to swap one - you definitely would not want to repeat later to change the other one.
check your impeller shaft also as groves in the shaft is usually why the seal goes in the first place (you may want to replace the shaft whilst you there)
is it cable or hydrolic clutch lever ? if cable then make sure there is 3mm free play on the lever ! is cable free and not dry , oil it !?? some clutch's have an adjuster in the middle , nut and screw , undo the nut and back the screw off about 2mm and try ! to do this remove the side case !! drain oil first !! if this doesnt solve it then replace the clutch plates , fiber and metal !
I recommend a motorcycletransmission oil as it has the proper additives for a wet clutch. I like yamaha's trans oil plus for my bikes.10w40 motor oil will do in a pinch. and I like Yamaha's Yamalube S for oil injection systems.