Post Sale Update: This Plonker sold for $2,300 after 12 bids on eBay.
The OSSA Plonker (“plonking” used to be a different term for trials riding, as you’d “plonk” around rugged terrain at low speeds) was built in conjunction with trials expert Mick Andrews. It was their first attempt at a true observed trials bike, and it was succeeded by the Mick Andrews Replica. In the US, the Plonker was only available via special order, which means that it’s a rare find nowadays.
The Plonker was OSSA’s trials competitor from 1969 to 1971, with a distinctive green/yellow paint scheme that makes me think of Lotus race cars and a 244cc two-stroke motor that produced 18 horsepower. That motor was paired with a 4-speed transmission, Betor suspension, 24mm IRZ carb, SLS drum brakes, and a total weight of 218 pounds.
This example spent many years in storage and was recently given a cosmetic restoration with a repaint in “Metallic British Racing Green and GM Competition Yellow”, which the seller says is “very close to the original color scheme.” There’s a few items that aren’t perfect, and the seller notes that this is not a concours example, but that just means you shouldn’t feel bad about using it as intended and getting it dirty! The seller says that the bike starts on the first kick but there’s no other description about how the bike runs.
Find this Plonker for sale in Boise, Idaho with bidding up to $1,225 and the reserve not yet met