Question about 2008 Yamaha yZ450F
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Part 8 How to disassemble motocross bike Draining radiator coolant YZ250F...
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Yamaha YZ450FA 2011 Owner Service Manual
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Yamaha YZ450F Owner Manual
Posted on Feb 01, 2017
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Posted on Jan 02, 2017
SOURCE: oil capacity 2008 yz450f
I believe the engine and transmission are shared, using the same oil.
You should have a sight glass on the left side, and it should be checked after a warm up, and then sit for a couple of minutes. I think it's close to a quart and a half.
Posted on Dec 12, 2009
Before doing either of these jobs, you'll have to run the engine for 8 to 10 minutes to warm up the engine, oil and water.
To change the oil - prop the motorcycle so that it's as close to level as possible, but will not tip over in either direction. Remove the oil fill cover on the back crankcase cover on the right (brake pedal) side. Look directly beneath the cylinders, you'll see a large hex-head bolt (drain plug) in the center of the crankcase. Make sure that you have a container with a capacity of in excess of one gallon under the bolt. Loosen and remove the drain plug (very quickly, the temperature of the oil will be sufficient to cause blisters if permitted to remain on the skin), but do not, if possible, allow it to fall into the pan. Permit the oil to drain fully; while it's draining, clean the plug carefully - you'll find a magnet protruding from the center of the plug, with metal filings collected on the surface - remove as many as possible before reinstalling.
Turn the plug back into the crankcase until oil ceases dripping, move the pan to the front of the engine. Behind the radiator, low on the front of the crankcase, you'll find the filter - it looks very much like the filters you're used to seeing in your car. If you're at the front of the bike, turn the filter counterclockwise to loosen and remove; remember that the filter holds about a half-pint of oil as hot as that you drained out of the crankcase, so keep your hands out of the way as much as possible. When the oil stops dripping, and the filter has been removed and disposed of, put a thin film of oil on the rubber ring on the bottom of the new filter, turn it clockwise to mount it on the crankcase, and tighten as firmly as you can with your hands.
Go back to the drain plug, remove and let whatever oil has collected drain out, then reinstall, tightening to 32 ft.-lbs (43nm).
Pour about 3 1/2 quarts of oil into the crankcase, replace the oil fill cover, start the engine and check for leaks at both the drain plug and the filter, tighten as necessary. To check the oil level, look for a glass window on the right side of the crankcase marked for high (max) and low (min) levels. Get on hands and knees and look under the front crankcase cover directly beside the right operator's footrest; you'll probably need a flashlight to read it. Once the oil level is between the minimum and maximum markings, tighten the oil fill cover, and return the bike to its' normal parking position on the kickstand.
To change the coolant - remove the driver's seat, fuel tank, all four cylinder side covers, and the right side cover (color-matched cover under driver's seat). Prop the motorcycle so that it's as close to level as possible, but will not tip over in either direction. Place a 24"-30" drain pan slightly forward of the center of the engine - if you do not have a large drain pan, a small one placed under the drains individually, IN THE ORDER LISTED, will work. Siphon all coolant from overflow reservoir under the side cover OR remove the center cover, remove bolts holding the reservoir to frame, invert the reservoir to empty, and reattach the reservoir to the frame.
Now, remove the radiator cap and the drain plug at the bottom of the radiator, allow the radiator to empty. Remove the plugs at the lower portion of each cylinder in no particular order, drain fully, then remove the drain plug from the bottom of the water pump (the large protrusion beside the front right driver's footrest). Once all drains have ceased dripping, reinstall the radiator plug (torque to 18 ft.-lb., 25nm), all four cylinder plugs (seat firmly in the drain holes), and the water pump plug (torque to 32 ft.-lb., 43nm). Fill the reservoir in the rear, then fill the radiator as much as possible, cap, and run the engine for 3-5 minutes to warm. Remove the radiator cap, check the radiator and refill, repeating until there is no air beneath the radiator cap when it is removed.
Reinstall the body panels, tank and seat, and return the bike to its' normal parking position on the kickstand. If additional coolant is needed it will be added to the reservoir - check frequently for about the next 100-150 miles.
Note on oil - I've always warned people away from oils that were labeled "energy conserving", but lately I've noticed that those same oils no longer carry that label. I've been seeing a new seal on them; on the outside of the seal are the words "American Petroleum Institute" on the top, "Certified" on the bottom, and in the center of the seal are the words "For Gasoline Engines", and - surprise, surprise! - they ALL contain molybdenum disulfide, the stuff that makes clutches slip. Check the bottles of the oil that you're considering for use in your motorcycle. If you see the API seal, keep going. Unfortunately, a member named "rasolheim" is learning the hard way how expensive an error like that can be; I hope that I can warn others before they make the same mistake.
Note on coolant - using an "extended-life" coolant makes good sense; it'll extend the interval between coolant changes and do a better job of protecting the aluminum cylinder block and heads. It does NOT, however, free you from the responsibility of checking the coolant level and color frequently. Periodic checks (I do it every day, before and after a ride) are your best protection against leaks and corrosion.
Posted on Jul 30, 2010
Follow the link to the parts break down for your cooling system. Part # 58 is your rad cap.
Posted on May 25, 2011
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