This DIY repair manual by Haynes covers 1973-1975 Honda Elsinore 250cc motocross (CR models 1973-on) and trail (models 1974-on) bikes, including:
Honda CR250M Motocross, 1973-1975
Honda CR250M1 Elsinore Motocross, 1973-1975
Honda MT250 Elsinore Trail, 1974-1975
Honda MT250K1 Elsinore Trail, 1974-1975
Book Excerpt: 1973-1975 Honda 250 Elsinore Repair Manual
ENGINE, CLUTCH AND TRANSMISSION
REASSEMBLING THE ENGINE UNIT | REPLACING THE CYLINDER BARREL
Place the new cylinder base gasket over the retaining studs having first lightly greased both surfaces to aid sealing.
Lubricate the cylinder bore with clean engine oil and with the piston a top dead center, slide the barrel onto the retaining studs. until it comes into contact with the piston (MT models).
On CR250M1 models the cylinder barrel is free, as only short studs are used.
Squeeze the rings, one at a time and slide the barrel over the piston.
Check that the ring ends have remained each side of their retaining pegs.
Great care is necessary during this operation as piston rings are very brittle and will break easily.
Should any difficulty be encountered in replacing the barrel, a piston ring clamp will prove a great help.
When the piston rings have engaged fully with the cylinder bore, slide the cylinder barrel down the retaining studs (CR250M and MT models), or align it with the studs (CR250M1 models), so that it seats on the new base gasket. (No gasket cement).
Refit and tighten the cylinder base nuts (CR models only), not forgetting to add the clutch adjuster clamp.
Place a clean rag in the inlet and exhaust ports.
WHEELS, BRAKES AND TIRES
REAR WHEEL | EXAMINATION
Refer to Section 2 of this Chapter. An identical procedure should be followed fir examining the rear wheel.
REAR BRAKE | REMOVAL, EXAMINATION, RENOVATION AND REASSEMBLY
Block the machine firmly so that the rear wheel is off the ground, but the front wheel is touching.
Pull out the split pin through the castellated nut of the rear wheel spindle and remove the nut and washer.
Pull out the split pin through the rear brake torque arm at the point where the arm joins the rear brake plate, and remove the nut and washer so that the torque arm can be detached.
Remove the rear brake adjusting nut and disconnect the rear brake cable from the brake arm. Pull the cable from the brake plate. Push the rear wheel slightly forward and remove the drive chain from the sprocket, after removing the spring link.
Pull out the rear wheel spindle and withdraw the rear wheel from the rear of the machine.
The rear brake is identical to the front brake and it should be dismantled, examined and reassembled, as described in Section 4 of this Chapter.
Before replacing the rear wheel in the frame, it is advisable to check the condition of the rear wheel sprocket, sprocket carrier and the cush drive rubbers, as described in the following Sections of this Chapter.
