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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Oil Plug on XR250
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[QUOTE="TexKDX, post: 127111, member: 16276"] jsmith, the bike you saw had a dry sump motor and carries a large amount of its oil in the frame. The Hondas use it as a means to help cool the motor prior to the advent of liquid cooled 4 strokes, plus it has other benefits such as less crank windage and more consistent pressure when the bike is jostled around during riding. Keep in mind you are seeing the evolution of the 1983 XR500 when you look at a new XR. The new KTM RFS don't carry oil in the frame like the Honda and the Yamaha YZ/WRF bikes. When you do get your 250, take a good read of the manual on how to check the oil. Dry sump systems can easily be misread and overfilled. The drill on the WR/YZ was run the bike for 3 minutes, hold it up vertical off the stand, turn it off, let it set 30 seconds, then take a dipsitck reading. This works on the Honda too I am told, and the reading is taken without screwing the dipstick in, just setting it in until the threads touch. Another common mistake made on the dry sump motors is not pulling the oil drain plug in the frame as well as the engine. I have a friend with a '95 KTM RXC with 3500 miles on it. When I did an oil change on it for him, he wanted to know what I was doing with the wrench on the frame - he had never drained all the oil out of the bike! Interestingly, the LC4 KTM has the dipstick on the engine. You have to partially fill it, run it, then top it off and check it. No you are not an idiot for asking this question and it is a perfect example of the point I was trying to make on the other thread here about the XR250. I advocate spending the time beforehand with the bike so you don't fubar the bike or yourself on the first ride or two. Good luck when you get the new ride. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Oil Plug on XR250
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