ENGINE AND FRAME NUMBERS

The RD used to get stolen a lot, and many ended up as track bikes. Check the numbers against the logbook carefully and look out for over-stamping. You don't want someone realising the engine on your new bike was theirs 30 years ago and demanding it back.

Frame: The RD frame was a cut above its rivals. Pull on the swing arm and check it over carefully. RD250s were very crashable, so you want to make sure everything is straight.

Servicing and care: While your average two-stroke might need more looking after than a fourstroke, they are easier to work on. The main service parts you will need are plugs and lubricants. Adjust the brakes and clutch, and check the gear oil level and the Autolube pump every 1500 miles. Officially you need to clean the plugs during the same period, but you might need to do it more frequently. Check points and timing, decoke the engine, and clean out the exhaust at 2000 miles; at 4000, clean and regrease the wheel bearings, replace the fork oil and inspect the generator brushes (Info: Clymer service manual).