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
New Project
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="timetraveller" data-source="post: 122316" data-attributes="member: 456"><p>Hi Erik, do you know which springs you have? To get some idea of whether there is too much spring pre-load you need to get the bike up to about its final weight and then look at the angle of the lower link. With the bike sitting on its own wheels the front of the lower link should be just below the horizontal, that is down at the front by, say 5 - 10 mm. Then when you sit on the bike and take your feet of the ground the front of the lower link should move upwards by, say, 5 - 10 mm. If it does not do that then there is too much pre-load and you can shorten the springs by about 6 mm and try again. If it really does not move significantly then my guess is that you have the wrong springs. I check the spring rate of the front spring by leaving them in their spring boxes and putting the bottom of the box on top of a piece of wood on some bathroom scales. The wood is there just to protect the scales. I then load a weight on to the top of the spring box and note how much the box has compressed. I try to do this by adding weights progressively. It does not matter if you do not know the exact weight being added as that shows up on the bathroom scales. In my case I do this by putting the top of the spring box into the ball hitch on the front of a trailer but if you have a more sophisticated system then that would be easier and better. If you have enough weight then with the 30 lbs/inch springs you should get a reduction in height/length of about 78 mm for a loading of 90lbs/41kgs.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 122316, member: 456"] Hi Erik, do you know which springs you have? To get some idea of whether there is too much spring pre-load you need to get the bike up to about its final weight and then look at the angle of the lower link. With the bike sitting on its own wheels the front of the lower link should be just below the horizontal, that is down at the front by, say 5 - 10 mm. Then when you sit on the bike and take your feet of the ground the front of the lower link should move upwards by, say, 5 - 10 mm. If it does not do that then there is too much pre-load and you can shorten the springs by about 6 mm and try again. If it really does not move significantly then my guess is that you have the wrong springs. I check the spring rate of the front spring by leaving them in their spring boxes and putting the bottom of the box on top of a piece of wood on some bathroom scales. The wood is there just to protect the scales. I then load a weight on to the top of the spring box and note how much the box has compressed. I try to do this by adding weights progressively. It does not matter if you do not know the exact weight being added as that shows up on the bathroom scales. In my case I do this by putting the top of the spring box into the ball hitch on the front of a trailer but if you have a more sophisticated system then that would be easier and better. If you have enough weight then with the 30 lbs/inch springs you should get a reduction in height/length of about 78 mm for a loading of 90lbs/41kgs. [/QUOTE]
Insert quotes…
Verification
What was Mr Irving's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Project
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