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
Coil Polarity
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: 36286" data-attributes="member: 597"><p>Without having a volt meter of the correct type, it is very hard to tell. A modern digital one will not show peak volts ( unless it is a really good one ) the old analog type with a moving needle might work ok. If you put the bike on it's rear stand, and with mag cowl and end cap removed you can check it while it is running by attaching the negative lead to the casing and touch the possitive lead to the centre bolt holding the points onto the armature. Simply rev the engine to say 2000 to 3000 revs and the voltage should read around 200 volts, however if the polarity is wrong then this figure will be significantly less....secondary voltage ( at the spark plug ) is directly proportional to primary voltage. I know that many magneto rebuilders simply refuse to believe this condition exists, but the facts are there to see. An osciliscope works to show this as well, but not too many Vincent owners out there own one.....surprisingly. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />....Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 36286, member: 597"] Without having a volt meter of the correct type, it is very hard to tell. A modern digital one will not show peak volts ( unless it is a really good one ) the old analog type with a moving needle might work ok. If you put the bike on it's rear stand, and with mag cowl and end cap removed you can check it while it is running by attaching the negative lead to the casing and touch the possitive lead to the centre bolt holding the points onto the armature. Simply rev the engine to say 2000 to 3000 revs and the voltage should read around 200 volts, however if the polarity is wrong then this figure will be significantly less....secondary voltage ( at the spark plug ) is directly proportional to primary voltage. I know that many magneto rebuilders simply refuse to believe this condition exists, but the facts are there to see. An osciliscope works to show this as well, but not too many Vincent owners out there own one.....surprisingly. :-)....Greg. [/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
Coil Polarity
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