Hi all!! First time posting to this great site. I just purchased a 1960 G12 650, online. Owner said it ran perfect. Yeah, right. I managed to get it running, but when trying to put it in gear, it just chattered, as if the clutch was not engaged. I pulled the side cover and can see the pressure plate releasing from the clutch pack. Also, when just stationary, not running, I can only move the shifter from 1st to 2nd. It's jammed after that. I am a car mechanic, hot rod builder, and am unfamiliar with the workings of this transmission. What do you all think? Somehow, I get the feeling ill be diving deep into this gearbox. Thanks in advance. I am going to drink heavily in preparation for the news,yet still remain hopeful. William Seattle, Wa
Did you "clear the plates" before starting? I have not run a Matchless but every other oil bath clutch Brit bike needs the plates freed by lifting the clutch and kicking over until the plates free, unless recently run, but I do first anyway. Brit gearboxes are generally direct drive, the output sprocket is on the mainshaft. Drive goes in the mainshaft, through a gear set to the layshaft and back to the high gear which the output sprocket is mounted. Top gear is "always" (I do not know of any that are not) 1:1 with the high gear locked by dogs to the mainshaft. The difference in boxes is how the forks are moved. Some (BSA singles and twins) use a flat plate with tracks, others (Triumph twins, triples) use a circular plate with tracks driven by a quadrant gear. '50s Royal Enfield 500 twin uses a rocking U arm. All very simple. You know that you have to rotate the gears slightly (rock the bike back and forth) to select gears at a stand still?