Plastic model motorcycle kits
There are many makers of plastic kits, the most well known, probably being Airfix, Tamiya and Revell. Kit scale varies from 1:24 to 1:6. The detail and quality of the model varies, depending on price and scale. The large scale models will come with rubber tubing for brake lines and working suspension units.
Airfix make a decent range of detailed motorcycles
Airfix also do a range of entry level kits