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
Magneto Problem
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="Kansas Bad Man" data-source="post: 51103" data-attributes="member: 778"><p>A new plug does not always work. Get a couple of the hottest heat range plugs with the smallest center electrode, these plugs are of a low resistance. This is the best way for the garage mechanic to go if a weak magneto is in question. A plug that is fouled or inoperable meaning the emf is inadequate to jump the gap of the plug rather it is going to ground due to a fouled path. Your Vincent at high revs, say 5,000 rpm will have a voltage far in excess needed to give a blue to white spark at points of emf leaks. Your Vincent will at idle with a good mag</p><p> jump a half inch gap with ease, spark plug removed H.T. lead to ground. Checking the spark plug for spark at atmospheric pressure does not insure spark in real life due to the much denser insulating air between electrode and ground due to the compression cycle of the engine. A Vincent in good nick will be able to jump a gap of 2 inches in the atmosphere running on one cylinder at around 3500 rpm. Last point, a new spark plug wire does not insure that it wont leak. Never take things for granted. Again, put it in a dark room and see what is going on.</p></blockquote><p></p>
[QUOTE="Kansas Bad Man, post: 51103, member: 778"] A new plug does not always work. Get a couple of the hottest heat range plugs with the smallest center electrode, these plugs are of a low resistance. This is the best way for the garage mechanic to go if a weak magneto is in question. A plug that is fouled or inoperable meaning the emf is inadequate to jump the gap of the plug rather it is going to ground due to a fouled path. Your Vincent at high revs, say 5,000 rpm will have a voltage far in excess needed to give a blue to white spark at points of emf leaks. Your Vincent will at idle with a good mag jump a half inch gap with ease, spark plug removed H.T. lead to ground. Checking the spark plug for spark at atmospheric pressure does not insure spark in real life due to the much denser insulating air between electrode and ground due to the compression cycle of the engine. A Vincent in good nick will be able to jump a gap of 2 inches in the atmosphere running on one cylinder at around 3500 rpm. Last point, a new spark plug wire does not insure that it wont leak. Never take things for granted. Again, put it in a dark room and see what is going on. [/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
Magneto Problem
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