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
600cc Comet Carbie?
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="davidd" data-source="post: 77567" data-attributes="member: 1177"><p>Greg,</p><p></p><p>Yes, I did remember that you had some problems, but the Factory Mk2 does the same, although not to the same extent. When comparing the Factory MK1 and Mk2, the Mk1 makes more cranking or starting pressure than the Mk2, due to the similar late closing of the intake on the Mk2. With the Factory Mk2 (usually no more than 75°) I would not be too concerned about bad starting, but I would be concerned about the cumulative effect of several mods that makes starting difficult...and using a cam that doesn't start as easily as the Mk 1. After all, the Phil's did not feel that the Mk2 was a suitable street cam although most owners today will put up with the problems.</p><p></p><p>There are programmable ignitions that will deal with the timing retardation issue, but that would take extensive dyno tuning, which is unlikely. The MSD 4217 comes to mind for single cylinders. It can be programmed to start at 4°, for example. I think it will go down to 0°, but it won't go negative for Bill. I think it will hold two timing curves which can be selected with a switch on the handlebars.</p><p></p><p>Once the Ariel Club gets wind of your tuning skills applied to the Square Four you will be inundated with the bikes.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 77567, member: 1177"] Greg, Yes, I did remember that you had some problems, but the Factory Mk2 does the same, although not to the same extent. When comparing the Factory MK1 and Mk2, the Mk1 makes more cranking or starting pressure than the Mk2, due to the similar late closing of the intake on the Mk2. With the Factory Mk2 (usually no more than 75°) I would not be too concerned about bad starting, but I would be concerned about the cumulative effect of several mods that makes starting difficult...and using a cam that doesn't start as easily as the Mk 1. After all, the Phil's did not feel that the Mk2 was a suitable street cam although most owners today will put up with the problems. There are programmable ignitions that will deal with the timing retardation issue, but that would take extensive dyno tuning, which is unlikely. The MSD 4217 comes to mind for single cylinders. It can be programmed to start at 4°, for example. I think it will go down to 0°, but it won't go negative for Bill. I think it will hold two timing curves which can be selected with a switch on the handlebars. Once the Ariel Club gets wind of your tuning skills applied to the Square Four you will be inundated with the bikes. David [/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
600cc Comet Carbie?
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