2. Remove the flywheel (see Section 15).
3. The old seal can be removed by applying light pressure with a screwdriver. Before removing the seal, measure the seating depth: install the new seal to the same depth.
Caution: Do not damage the surfaces of the crankshaft and oil seal housing to avoid oil leakage.
4. Wash the journal and the oil seal seat with solvent or gasoline. Check the journal for dents and scratches that could damage the sealing lip of the oil seal. If scratches are found, try to polish them out. Otherwise, the crankshaft must be replaced.
5. Lubricate the seal. Fill the seal cavity with consistent grease.
6. Carefully insert the seal and tap it into place with a hammer.
7. Assemble the power unit, start the engine and check for oil leaks.
(Information obtained from this source: www.hondabook.ru)