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 Rear Sets
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="Pete Appleton" data-source="post: 20941" data-attributes="member: 145"><p><strong>600cc</strong></p><p></p><p>Paul</p><p>Increasing to 600cc is not a straight forward swap of parts. I have fitted a big bore kit, supplied by Vinparts, in a special that I am working on. I believe that these comments are common to most of the kits available:-</p><p></p><p>1. A 90 mm piston is about the largest that can be easily fitted without major work. With a standard crankshaft stroke of 90mm this only gives you 570cc.</p><p></p><p>2. To fit the barrel in the crankcase, you have to strip the engine and bore out the crankcase mouth.</p><p></p><p>3. Different weight pistons mean that you should ideally have the crank re-balanced.</p><p></p><p>4. The cylinder head needs machining to clear the piston and get the right compression ratio.</p><p></p><p>5. If you really want 600cc then you need to get the crank re-worked to give increased stroke.</p><p></p><p>I went for 570cc but only because my engine was a wreck and I needed to do all of this work anyway. It is not a job to undertake lightly and is pretty much irreversible.</p><p></p><p>Peter</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 20941, member: 145"] [b]600cc[/b] Paul Increasing to 600cc is not a straight forward swap of parts. I have fitted a big bore kit, supplied by Vinparts, in a special that I am working on. I believe that these comments are common to most of the kits available:- 1. A 90 mm piston is about the largest that can be easily fitted without major work. With a standard crankshaft stroke of 90mm this only gives you 570cc. 2. To fit the barrel in the crankcase, you have to strip the engine and bore out the crankcase mouth. 3. Different weight pistons mean that you should ideally have the crank re-balanced. 4. The cylinder head needs machining to clear the piston and get the right compression ratio. 5. If you really want 600cc then you need to get the crank re-worked to give increased stroke. I went for 570cc but only because my engine was a wreck and I needed to do all of this work anyway. It is not a job to undertake lightly and is pretty much irreversible. Peter [/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 Rear Sets
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