The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Gearbox
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="highbury731" data-source="post: 50250" data-attributes="member: 1557"><p>Two important choices: for AMC boxes, the lower lug is forward to alter the angle of the box, mounting lugs may be different width. BigSid fitted a Norton box to his hot Comet, and wrote about fitting it, perhaps ask Matt or check if details are on TheVincent.com. </p><p></p><p>If you choose Norton, do you want to use a Norton clutch (single row chain) or Commando diaphragm clutch with triplex chain or convert to belt? For this, the mainshaft is longer with a circlip groove for the diaphragm spring. Don't panic, Norton shafts can be interchanged, various lengths were made to give different chain alignments. Avoid 1956-1960 boxes, the ratio set is peculiar making replacement gears difficult. Post 1960 boxes have a modified ratio set, slightly closer, which remained in use for most subsequent machines (barring a higher second gear for later Commandos to ease meeting noise regulations...). Be careful with Mk3 Commando boxes, the gear shift shaft exits through the primary drive case, not on the right. </p><p></p><p>There are lots of ways of altering the ratio set, due to interchangeability with racing cluster and many of the pre AMC gears can be made to fit.</p></blockquote><p></p>
[QUOTE="highbury731, post: 50250, member: 1557"] Two important choices: for AMC boxes, the lower lug is forward to alter the angle of the box, mounting lugs may be different width. BigSid fitted a Norton box to his hot Comet, and wrote about fitting it, perhaps ask Matt or check if details are on TheVincent.com. If you choose Norton, do you want to use a Norton clutch (single row chain) or Commando diaphragm clutch with triplex chain or convert to belt? For this, the mainshaft is longer with a circlip groove for the diaphragm spring. Don't panic, Norton shafts can be interchanged, various lengths were made to give different chain alignments. Avoid 1956-1960 boxes, the ratio set is peculiar making replacement gears difficult. Post 1960 boxes have a modified ratio set, slightly closer, which remained in use for most subsequent machines (barring a higher second gear for later Commandos to ease meeting noise regulations...). Be careful with Mk3 Commando boxes, the gear shift shaft exits through the primary drive case, not on the right. There are lots of ways of altering the ratio set, due to interchangeability with racing cluster and many of the pre AMC gears can be made to fit. [/QUOTE]
Insert quotes…
Verification
What was Mr Vincent's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Gearbox
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top