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
Use of Iridium Spark Plugs
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="BigEd" data-source="post: 22201" data-attributes="member: 161"><p>If your bike is difficult to start due to ignition problems then an Iridium spark plug might help. They have an electrode made from an extremely corrosion resistant metal (Iridium) so the electrode can be made thinner but still have a long life. </p><p> The thinner the electrode the less voltage needed for a spark to jump a gap. You can achieve the same result by filing a standard plug to a finer point but it would need adjusting more often.</p><p>You can also close up the gap on your plug to 0.010" to give the magneto an easier time but you may then have fouling problems if your engine is oily. Also non-resistor plug caps and leads ensures any available voltage get to the plug gap.</p><p></p><p>I use B7ES in my Rapide. The ideal grade of plug depends on several factors such as state of tune, operating conditions and how oily your engine is. A smaller NGK number helps combat plug fouling if your engine is oily. A higher number is better for highly tuned engines that may be run hard for longer periods. NGK plugs seem to have a have a fairly wide heat range so within reason the grade is not too critical.</p><p></p><p>You say that you have a "standard 6 volt magneto". Magnetos do not use the battery or charging circuit of a bike but generate their own electricity so they are not 6 or 12 volt. If your ignition is 6 volt then perhaps you have a magneto body that has been adapted to take an electronic conversion in which case you need a good battery or charging circuit to run.</p><p></p><p>If the engine is in good tune and the carb is in good condition with fresh fuel then difficult starting is often an indication that the magneto needs attention. A new or different plug may help starting but it will not cure a failing ignition system.</p></blockquote><p></p>
[QUOTE="BigEd, post: 22201, member: 161"] If your bike is difficult to start due to ignition problems then an Iridium spark plug might help. They have an electrode made from an extremely corrosion resistant metal (Iridium) so the electrode can be made thinner but still have a long life. The thinner the electrode the less voltage needed for a spark to jump a gap. You can achieve the same result by filing a standard plug to a finer point but it would need adjusting more often. You can also close up the gap on your plug to 0.010" to give the magneto an easier time but you may then have fouling problems if your engine is oily. Also non-resistor plug caps and leads ensures any available voltage get to the plug gap. I use B7ES in my Rapide. The ideal grade of plug depends on several factors such as state of tune, operating conditions and how oily your engine is. A smaller NGK number helps combat plug fouling if your engine is oily. A higher number is better for highly tuned engines that may be run hard for longer periods. NGK plugs seem to have a have a fairly wide heat range so within reason the grade is not too critical. You say that you have a "standard 6 volt magneto". Magnetos do not use the battery or charging circuit of a bike but generate their own electricity so they are not 6 or 12 volt. If your ignition is 6 volt then perhaps you have a magneto body that has been adapted to take an electronic conversion in which case you need a good battery or charging circuit to run. If the engine is in good tune and the carb is in good condition with fresh fuel then difficult starting is often an indication that the magneto needs attention. A new or different plug may help starting but it will not cure a failing ignition system. [/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
Use of Iridium Spark Plugs
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