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 Ignition Timing 2018
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="Martyn Goodwin" data-source="post: 121744" data-attributes="member: 2433"><p>David,</p><p></p><p>Some time back I had reworked the ATD on my standard Comet (7.1:1 compression, Mk1 Cam, 30mm Concentric carb) to give an advance range of 30 degrees (34 advanced, 4 retarded). The result was very easy starting and acceptable performance.</p><p></p><p>A few days back I had cause to check the timing and in doing so I made a mistake and set it at 30 advanced, 0 retarded. First sign of my error was difficult starting - that was a bit of a downer but I decided on a quick ride anyway. I noticed when pulling away from standstill the bike seemed down on power till the revs rose a tad then all was well - well it was great, on hills where I would routinely drop down a gear the bike sailed up them in top and actually accelerated with it. On one of my frequently used long, flat and uncrowded runs the comfortable cruising speed appeared to have increased by around 10 mph.</p><p></p><p>My conclusion - seat of the pants - is that full advance of 30 BTDC give significantly more torque that the 34 I had been using. And no, no sign of the exhaust pipe getting hot or blueing.</p><p></p><p>I am now working on my spare ATD components with the aim of having just 26 degrees of advance (13 on the magneto [remember the standard 'original' ATD has 18 degrees at the magneto]) so I can revert to 4 BTDC for easy starting and 30 BTDC as max advance for performance.</p><p></p><p>I hope to have the 'new' setup in place within the next 2 weeks.</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 121744, member: 2433"] David, Some time back I had reworked the ATD on my standard Comet (7.1:1 compression, Mk1 Cam, 30mm Concentric carb) to give an advance range of 30 degrees (34 advanced, 4 retarded). The result was very easy starting and acceptable performance. A few days back I had cause to check the timing and in doing so I made a mistake and set it at 30 advanced, 0 retarded. First sign of my error was difficult starting - that was a bit of a downer but I decided on a quick ride anyway. I noticed when pulling away from standstill the bike seemed down on power till the revs rose a tad then all was well - well it was great, on hills where I would routinely drop down a gear the bike sailed up them in top and actually accelerated with it. On one of my frequently used long, flat and uncrowded runs the comfortable cruising speed appeared to have increased by around 10 mph. My conclusion - seat of the pants - is that full advance of 30 BTDC give significantly more torque that the 34 I had been using. And no, no sign of the exhaust pipe getting hot or blueing. I am now working on my spare ATD components with the aim of having just 26 degrees of advance (13 on the magneto [remember the standard 'original' ATD has 18 degrees at the magneto]) so I can revert to 4 BTDC for easy starting and 30 BTDC as max advance for performance. I hope to have the 'new' setup in place within the next 2 weeks. Martyn [/QUOTE]
Insert quotes…
Verification
The Series 'A' Rapide was known as the '********' Nightmare?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Ignition Timing 2018
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