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C'do jumping out of first gear?? #62693
02/18/05 9:06 pm
02/18/05 9:06 pm
Joined: Aug 2001
Posts: 64
Saint Petersburg,Florida,USA
John Gough Offline OP
BritBike Forum member
John Gough  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 64
Saint Petersburg,Florida,USA
I recently inherited a 1972 Combat Commando. On stiff acceleration the bike jumps out of first gear. I replaced the first gear layshaft bushing.( suggested by the Norton INOA list) This did not solve the problem. Any suggestions on what I should look for next? Thanks in advance for your kind consideration of my problem.


John R. Gough II
'65 Velocette MSS
'55 BSA Super Rocket
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Re: C'do jumping out of first gear?? #62694
02/18/05 11:59 pm
02/18/05 11:59 pm
Joined: Nov 2003
Posts: 698
Orlando fla/ shady valley Tn
B
bill50cal Online content
BritBike Forum member
bill50cal  Online Content
BritBike Forum member
B
Joined: Nov 2003
Posts: 698
Orlando fla/ shady valley Tn
the dog's on layshaft second. the holes in layshaft 1st that the dog's engage in. shift fork on layshaft. endplay in layshaft.

bill


windy
72 combat
switchbackcreek.com
Re: C'do jumping out of first gear?? #62695
02/19/05 4:18 pm
02/19/05 4:18 pm
Joined: Oct 2004
Posts: 243
Seattle, WA USA
Dr_Hiller Offline
BritBike Forum member
Dr_Hiller  Offline
BritBike Forum member
Joined: Oct 2004
Posts: 243
Seattle, WA USA
John:

Though I can't, here's a couple 'o links that might help....

Fred at Old Britts recently put up a detailed Tech series on the Commando Transmission on the Build & Restore page - scroll down to #8, on this page: http://www.oldbritts.com/ob_new_bike.html

The direct link to his "how it works" article is here: http://www.oldbritts.com/gearbox_info.html and the dissasembly/inspection guide is here: http://www.oldbritts.com/gearbox_info.html

Take care,
David


Ride safe,
David
--------------------------

1971 Norton Commando (parts bucket mongrel)
Re: C'do jumping out of first gear?? #62696
02/20/05 10:27 am
02/20/05 10:27 am
Joined: Sep 2002
Posts: 500
belgium
ludwig Offline
BritBike Forum member
ludwig  Offline
BritBike Forum member
Joined: Sep 2002
Posts: 500
belgium
can you see the kickstart move outwards a bit when shifting in first ?
Lateral play of kickstart shaft should be minimum .
put shims between kick mech. and steel bushing in primary cover .

Re: C'do jumping out of first gear?? #62697
02/20/05 12:59 pm
02/20/05 12:59 pm
Joined: Aug 2001
Posts: 64
Saint Petersburg,Florida,USA
John Gough Offline OP
BritBike Forum member
John Gough  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 64
Saint Petersburg,Florida,USA
Thanks very much to all of you for your kind help with my problem. I now know where to start. Thanks again John G.


John R. Gough II
'65 Velocette MSS
'55 BSA Super Rocket
Re: C'do jumping out of first gear?? #62698
02/20/05 6:01 pm
02/20/05 6:01 pm
Joined: Oct 2003
Posts: 11,138
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member
Joined: Oct 2003
Posts: 11,138
North Georgia, USA
John G -
Although the cause might be lay shaft end play, all the damaged parts should be replaced or at least seriously inspected and compared to new parts when the shaft is fixed.

This would include the shifter cam, shifter fork, first gear and the mating dogs (2nd gear lay?). If you fix half of it you'll have to pay all over again when and if the jumping begins again.

Hope this helps. bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: C'do jumping out of first gear?? #62699
02/21/05 12:37 pm
02/21/05 12:37 pm
Joined: Aug 2001
Posts: 888
Annapolis, MD
Dennis B Offline
BritBike Forum member
Dennis B  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 888
Annapolis, MD
Before you take apart your gearbox, it's a good idea to check the play
in the sleeve bearing. That's the big one on the drive side.
first remove the primary inspection plug (middle plug) and move the chain
up & down (hard). With your other hand feel the gearbox sprocket.
A little bit of motion of the drive chain is normal, but the sprocket should not
have any noticeable fore and aft movement. Or clunk-clunk feel.
When these bearings go bad, they spin in the case.
The repair for this would depend on just how much damage was done.
If the bearing is loose, you will need to take apart the primary also to gain access to it.
Hope this helps
Cheers
Dennis B
P.S.
The article that Fred Eaton at Old Britts did is excellent. However he said to use Loctite Red for a loose sleeve bearing, I would suggest using Loctite Sleeve Retainer 640.


Member # 182
'73 750 Commando
'72 Combat Commando
'71 Triumph Blazer
'69 Victors
'68 Starfire
'51 Royal Enfield 250 'S'

Re: C'do jumping out of first gear?? #62700
02/21/05 3:11 pm
02/21/05 3:11 pm
Joined: Oct 2004
Posts: 243
Seattle, WA USA
Dr_Hiller Offline
BritBike Forum member
Dr_Hiller  Offline
BritBike Forum member
Joined: Oct 2004
Posts: 243
Seattle, WA USA
Dennis:

I'll see Fred today and pass on your suggestion. He's always open to "better" approaches - and genuinely appreciative to boot.

(See the BAD gears in his cutaway tranny? They're out of my bike. Ughh.)

Take care,
David


Ride safe,
David
--------------------------

1971 Norton Commando (parts bucket mongrel)

Moderated by  Dave Comeau 


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