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Matchless G12 Clutch problem. #725505
02/13/18 11:13 pm
02/13/18 11:13 pm
Joined: Feb 2018
Posts: 26
WA
W
WilliamLangton Offline OP
BritBike Forum member
WilliamLangton  Offline OP
BritBike Forum member
W
Joined: Feb 2018
Posts: 26
WA
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


william langton mccormick
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Re: Matchless G12 Clutch problem. [Re: WilliamLangton] #725526
02/14/18 1:45 am
02/14/18 1:45 am
Joined: Nov 2006
Posts: 248
USA, WA state
R
russrudolph Offline
BritBike Forum member
russrudolph  Offline
BritBike Forum member
R
Joined: Nov 2006
Posts: 248
USA, WA state
Try the matchless site. I once had a 58 g-12 had to clean friction plates for clutch to work correctly.

Re: Matchless G12 Clutch problem. [Re: russrudolph] #725528
02/14/18 2:15 am
02/14/18 2:15 am
Joined: Feb 2018
Posts: 26
WA
W
WilliamLangton Offline OP
BritBike Forum member
WilliamLangton  Offline OP
BritBike Forum member
W
Joined: Feb 2018
Posts: 26
WA
Thanks!


william langton mccormick
Re: Matchless G12 Clutch problem. [Re: WilliamLangton] #725567
02/14/18 4:18 pm
02/14/18 4:18 pm
Joined: Jan 2004
Posts: 3,756
ca, us
D
DMadigan Offline
BritBike Forum member
DMadigan  Offline
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D
Joined: Jan 2004
Posts: 3,756
ca, us
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?


Moderated by  Alan_nc 


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