SOURCE: I have a yamaha YZ 250 F. The oil has become milky
the most common reason for this to happen is the head gasket has blown resulting in water getting into your oil. not really a big job to fix for a competant mechanic. hope this helps.
SOURCE: water leak/mixing with oil
change the seal behind the water pump impeller
the shifter shaft seal will stop leaking
if it continues to mix water and oil you will have to change the head gasket
SOURCE: wat kind of coolant is good for a 04 yz 450
1 litre of oil in engine or 1.1 litre of oil if you change oil filter and you drain the oil underneith the engine there will be a plug this just simply comes out and the oil drains but warm the engine first before you do this and i would recccomend using silkolene pro 4 plus 5w-40 and also use silkolene pro cool its ready mix i can get these oils if you reccomend and i can send them to your location
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SOURCE: 04 yz 450 backfires and is hard to start when is c...
Runs better with choke means the mixture is lean,
Has the exhaust been changed.?
Did this problem just begin.?
Check for air leaks on intake manifold.
Clean carb.
Check valve clearances
raise the needle jet one notch
one size up in the main jet.
check one item at a time, and write notes about jetting changes.and improvements
I also run Moreys upper cylnder lube, helps starting hot or cold, and helps stop "cough stopping" with heavy rear brake use
SOURCE: How to check the oil
OK to check oil level you have a little dip stick on the left hand side on the frame of bike just in front of the fuel tank to check this dip stick you need to start the bike and idle only (not rev up or ride) and you idle the motor for 2-3 minutes with the bike in upright position. then turn off motor keep in up right position and remove dip stick - wipe the stick clean then insert dip stick back in its hole (without screwing in) then remove it to see oil levels.
a good quality 20w-40 weight oil (motor bike specific) is a good choice but pretty much any decent oil from your motorcycle shop would be OK just discuss it with them when you purchase it I not sure what country you from but where I live our Yamaha shops sell Yamalube and this is perfect a bit pricey but for our favourate toy, it is worth it!
To fill the oil there is another plug on left hand side again at the front end of the motor you will see it is the only plug there that can be opened with fingers - you will need a funnel to fill cleanly as is pretty difficult to pour into it with out spilling otherwise?
Your bike holds only 1.2 liters (1200ml) of oil in total so if you not changing oil filter and completely emptying then oil lines, only add up to 1 liter for a simple oil dump and refill.
Hint for the day with oil is - On a MX bike the more often you replace the oil the longer it will last before needing repair I would always recommend changing oil either once a month or every 3 hours of riding use which ever comes first !
I am often told I am over cautious with this oil change strategy but I also have YZ450f 05 and a 2003 model and I have never had to rebuild because of break down or fault with motor
Maybe this is coincidental ? but then again - Maybe not ??
good luck hope this helps a little
regards Jamie
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