Yamaha WR250FM service manual Crankcase, Separation steps

CRANKCASE AND CRANKSHAFT

ENG

a

4

REMOVAL POINTS

Crankcase

1.Separate:

•Right crankcase

•Left crankcase

Separation steps:

•Remove the crankcase bolts 1, hose guide 2 and clutch cable holder 3.

NOTE:

Loosen each bolt 1/4 of a turn at a time and after all the bolts are loosened, remove them.

•Remove the right crankcase 4.

NOTE:

•Place the crankcase with its left side downward and split it by inserting a screw- driver tip into the splitting slit a in the crankcase.

•Lift the right crankcase horizontally while lightly patting the case splitting slit and engine mounting boss using a soft ham- mer, and leave the crankshaft and trans- mission with the left crankcase.

CAUTION:

Use soft hammer to tap on the case half. Tap only on reinforced portions of case. Do not tap on gasket mating surface. Work slowly and carefully. Make sure the case halves separate evenly. If one end “hangs up”, take pressure off the push screw, realign, and start over. If the cases do not separate, check for a remaining case screw or fitting. Do not force.

•Remove the dowel pins and O-ring.

4 - 95