How do you remove the oil filter on the end of the crankshaft on a 1973 Honda CB 250

To change your oil you will need 4 quarts of oil, a filter, and a new aluminum drain plug washer. You can reuse the old one if it has not been squished out of shape. Your motorcycle comes from Honda usually with 10w-40 mineral base motorcycle oil.

Capacity is between 1.3 and 1.8 liters. I know that is quite a gap, but it will depend on how much of the old oil you remove when performing an oil change on your Honda CB 250.

this bike seat bolts on one bolt on each side of seat, towards the rear of the seat, then lift tail end of seat and pull backward.

It does not have an oil filter like what you are thinking of. It has a centrifugal oil filter. On the right end of the crankshaft there is a conical rotor. It turns with the crank and dirt particles get thrown to the inside wall of the rotor. The dirt builds up there and is cleaned out with a screwdriver, knife, small scraper, whatever. You will think you are destroying some type of gasket but dirt is all it is. You may need to remove the right side case for full access. I can't remember for sure.Go to www.babbittsonline.com/parts/viewbybrand/parts.aspx for diagrams and parts as available. Please rate my answer.

You don't really "change" the filter. You just clean it. There is a screen filter on the bottom of the oil pump that serves to do a basic filter of the oil going into the oil pump. The real "filter is a centrifugal filter on the right end of the crankshaft. The spinning filter forces the heavy dirt particles to the inner rim of the filter where they build up to a somewhat solid mass. A screw driver pushed into the mass will break the dirt up and when most of the dirt mass is removed, a can of carb cleaner can finish the job. Only minor dis-assembly of the filter is needed to clean it. There is no need to actually remove the filter from the crankshaft.

You can download a free factory service manual at www.carlsalter.com/motorcycle-manuals.asp Please rate my answer. Thanks.

depends on if choke piston is moving free an not seized if stuck need to remove carb an soak it with no plastic or rubber parts in carb cleaner

Check the service manual I sent you. All sorts of good information in it.

Again, please rate this answer. > four diamonds would be nice.