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 'A' 500cc/1000cc Bikes
B.T.H Mag-Dyno
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="billirwinnz" data-source="post: 140012" data-attributes="member: 1697"><p>With the old magneto fitted it is now starting as it should <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>I have spun the BTH in the lathe in a darkened room. I don't have continuously variable speed but at 190rpm there is a weak spark that doesn't look reliable. Put a piece of normal copier paper between the plug points and it kills the spark. It's likely that it doesn't produce a spark under compression pressure at this speed. At the next step up, 300rpm, there's a strong very visible spark that has no problem making holes in the paper.</p><p></p><p>From this it seems that unless the motor spins at 400rpm or perhaps more the spark is going to be weak. I haven't been able to measure cranking speed but on a cold engine it is very sluggish and probably well below 400rpm.</p><p></p><p>Thanks to all for your help and suggestions.</p><p></p><p>Bill</p></blockquote><p></p>
[QUOTE="billirwinnz, post: 140012, member: 1697"] With the old magneto fitted it is now starting as it should :) I have spun the BTH in the lathe in a darkened room. I don't have continuously variable speed but at 190rpm there is a weak spark that doesn't look reliable. Put a piece of normal copier paper between the plug points and it kills the spark. It's likely that it doesn't produce a spark under compression pressure at this speed. At the next step up, 300rpm, there's a strong very visible spark that has no problem making holes in the paper. From this it seems that unless the motor spins at 400rpm or perhaps more the spark is going to be weak. I haven't been able to measure cranking speed but on a cold engine it is very sluggish and probably well below 400rpm. Thanks to all for your help and suggestions. Bill [/QUOTE]
Insert quotes…
Verification
What was Mr Vincent's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'A' 500cc/1000cc Bikes
B.T.H Mag-Dyno
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