A A A
Avatar

Please consider registering
Guest

Search

— Forum Scope —






— Match —





— Forum Options —





Minimum search word length is 3 characters - maximum search word length is 84 characters

Register Lost password?
sp_Feed sp_PrintTopic sp_TopicIcon
lack of spark
Avatar
tulane
Guest
Guests
1
November 9, 2011 - 11:41 am
sp_Permalink sp_Print

whilst riding my D7 it suddenly stopped. all i have found is a lack of spark,there is a pulse but not enough to form a spark. even with the plug cap off. i am running a rooster booster junior ignition and that seems to be working . It has a wipac ac generator and i have changed the coil for a new one still a feeble output at the plug lead. any ideas anyone.

Avatar
Charlie
Top Gear User
Club Member
Forum Posts: 103
Member Since:
October 4, 2011
sp_UserOfflineSmall Offline
2
November 9, 2011 - 4:42 pm
sp_Permalink sp_Print

I fitted a new coil to my D7 but after only 100 or so miles the coil has failed. I think the quality of the replacement coils is suspect. I have solved the problem by removing the coil and fitting an external coil under the seat as the later models have.

charlie

Avatar
Doug Brown
Guest
Guests
3
November 9, 2011 - 11:05 pm
sp_Permalink sp_Print

Check/replace the condensor.Or quickly clean up the points that may have arced and insulated themselves.Also check the resistance reading from the coil to the engine with the points open and then with them shut..It should be open circuit (not connected) so you have no shorted out lt lead.And the points closed check for high resistance accross the points and lead crimps should be about .002 ohms ish.

Avatar
pathat
Guest
Guests
4
November 10, 2011 - 10:03 am
sp_Permalink sp_Print

pathat.My sudden stops were caused by a bad connecting line fuse.Also the wires connecting under the two grub screws were not very well connected.just top and abaft the points.When I was searching for fault ,sometimes I had a good spark sometimes weak.good luck.pathat.

Avatar
davidwb
Whitehill Hampshire.
Top Gear User
Site Member
Forum Posts: 201
Member Since:
October 7, 2011
sp_UserOfflineSmall Offline
5
November 10, 2011 - 8:39 pm
sp_Permalink sp_Print

I came to a halt when my spark plug whiskered. Have you changed the plug?

Una, my Dad's original 1949 D1.

Ariel 350 Red Hunter.

Moto Guzzi V7 Classic, for traveling to places a bit faster.

Avatar
Paxo
Guest
Guests
6
November 11, 2011 - 11:48 am
sp_Permalink sp_Print

As the Rooster Junior is quickly removeable, I would start by removing it and refitting a condensor for testing. Even if the bike starts following this it is possible the RBJ is not at fault.

Most common issues are:-

1/. Insulator on points post (rear of magneto housing) failing.
2/. Bad connections.
3/. Failing coil. (even new ones die).
4/. Failing HT Lead.
5/. Bad Spark plug (esp. under load... sometimes they work outside the engine but not in.)
6/. Closed points (less likely with an RBJ)

and of course it could be the RBJ itself... if this is the case just return it for replacement.

Regards

Paxo..

Avatar
paul
Top Gear User
Site Member
Forum Posts: 51
Member Since:
November 10, 2011
sp_UserOfflineSmall Offline
7
November 11, 2011 - 8:05 pm
sp_Permalink sp_Print

hi mates, i had the same problem with my d7, changed everthing it turned out to be lack of magnetism in the flywheel after replacing it with n.o.s item the bike starts after a couple of kicks even after a week or so,a big fat juicy spark....only about a third of the circumference of old one had magnetism easily checked by holding a piece of metal around the circumference of the flywheel. Paul

Forum Timezone: Europe/London

Most Users Ever Online: 223

Currently Online: Patternmaker9
9 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

cocorico: 3588

Cornish Rooster: 3310

bart: 3125

Blue Heeler: 2698

Sprung Chicken: 2653

David Dale: 2484

Mags 1: 2335

Piquet: 2315

Munchkin: 2209

nickjaxe: 2091

Newest Members:

_2883

Forum Stats:

Groups: 9

Forums: 48

Topics: 12560

Posts: 108812

 

Member Stats:

Guest Posters: 1477

Members: 2048

Moderators: 0

Admins: 4

Administrators: Bantam-Super, JMD, Springs, Stoo63