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
BTH Magneto sparks erratically...
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="greg brillus" data-source="post: 81783" data-attributes="member: 597"><p>I actually have one here that is on a freshly rebuilt 600 Comet engine and we have decided to run it as a single fire only. The chap from BTH said that basically on the twin fire version that two output coils are driven from the one output within the unit itself. I asked if anyone had any complaints or suffered any issues from the ones sold, but he said "Not really" But I know of several who have engines that have had mechanical failures (piston) or are very difficult to start. As far as I can tell the only ignition unit that seems to be made with the correct advance to suit twin plug ignitions is the electronic ones made by Grosset in France. I recently installed one on a modern Egli running a 1000 cc brand new engine with the squish band twin plug heads (terry's ones) and it is set up so full advance is set at 28 degrees (recommended) and the retarded position is at 4 to 5 degrees BTDC. The owner is extremely happy and says it starts, runs and ticks over far better than it ever has before. From what I can see, the only way to get a twin spark BTH to have a better advance curve would be to install one that has "Fixed" ignition and run a genuine ADT with the travel reduced accordingly. Like I said, the chap from BTH seemed completely lost when I asked about different advance curves, as though they have always been made that way, so why bother changing............what can you do.........<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite12" alt="o_O" title="Er... what? o_O" loading="lazy" data-shortname="o_O" /></p></blockquote><p></p>
[QUOTE="greg brillus, post: 81783, member: 597"] I actually have one here that is on a freshly rebuilt 600 Comet engine and we have decided to run it as a single fire only. The chap from BTH said that basically on the twin fire version that two output coils are driven from the one output within the unit itself. I asked if anyone had any complaints or suffered any issues from the ones sold, but he said "Not really" But I know of several who have engines that have had mechanical failures (piston) or are very difficult to start. As far as I can tell the only ignition unit that seems to be made with the correct advance to suit twin plug ignitions is the electronic ones made by Grosset in France. I recently installed one on a modern Egli running a 1000 cc brand new engine with the squish band twin plug heads (terry's ones) and it is set up so full advance is set at 28 degrees (recommended) and the retarded position is at 4 to 5 degrees BTDC. The owner is extremely happy and says it starts, runs and ticks over far better than it ever has before. From what I can see, the only way to get a twin spark BTH to have a better advance curve would be to install one that has "Fixed" ignition and run a genuine ADT with the travel reduced accordingly. Like I said, the chap from BTH seemed completely lost when I asked about different advance curves, as though they have always been made that way, so why bother changing............what can you do.........o_O [/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
BTH Magneto sparks erratically...
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