BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auction JRC Engineering dealers JWood Auction
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
MikesClassics
MikesClassics
Queensland, Australia
Posts: 83
Joined: November 2016
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
209 registered members (68 royalstar tony), 1,772 guests, and 587 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Simon.Holyfield, Bushcreature, Doug Valley, tim_v7, BosBSA
10032 Registered Users
Top Posters(30 Days)
Lannis 144
kommando 102
Stuart 65
Popular Topics(Views)
476,308 mail-order LSR
Forum Statistics
Forums33
Topics65,711
Posts635,140
Members10,032
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
BSA B25 Points Cam #507592
09/23/13 5:39 pm
09/23/13 5:39 pm
Joined: Sep 2013
Posts: 14
Nashville, TN
W
wkoenig Offline OP
BritBike Forum member
wkoenig  Offline OP
BritBike Forum member
W
Joined: Sep 2013
Posts: 14
Nashville, TN
I took a look behind the points cover on my Starfire and found that the cam for the spark advance turns freely back and forth it allotted travel, but there doesn't seem to be any spring tension to return it to its pre-advanced position. I have a feeling this a bad sign, like the spring is shot or missing. I've had this bike running but I haven't ridden it yet. It idles and revs fine. Any advice?

Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
Re: BSA B25 Points Cam [Re: wkoenig] #507631
09/23/13 9:29 pm
09/23/13 9:29 pm
Joined: Aug 2001
Posts: 3,871
Cape Carteret, NC
M
Mr Mike Offline
BritBike Forum member
Mr Mike  Offline
BritBike Forum member
M
Joined: Aug 2001
Posts: 3,871
Cape Carteret, NC
There should be a couple of springs attached to the counterweights. Under loads and acceleration it is likely to advance rapidly and likely produce knocking (pinking). I think you can buy the springs. A lot of folks have perfectly good advance mechanisms that they'll give you since they converted to electronic ignition.

Mr Mike

Last edited by Mr Mike; 09/23/13 9:30 pm.
Re: BSA B25 Points Cam [Re: Mr Mike] #507640
09/23/13 10:05 pm
09/23/13 10:05 pm
Joined: Sep 2013
Posts: 14
Nashville, TN
W
wkoenig Offline OP
BritBike Forum member
wkoenig  Offline OP
BritBike Forum member
W
Joined: Sep 2013
Posts: 14
Nashville, TN
Thanks Mike. I'll look for the springs. Meanwhile, if anyone has an AAU they like to offer, I'd be grateful.

Re: BSA B25 Points Cam [Re: wkoenig] #507685
09/24/13 8:38 am
09/24/13 8:38 am
Joined: Sep 2002
Posts: 7
crankbuster Offline
BritBike Forum member
crankbuster  Offline
BritBike Forum member
Joined: Sep 2002
Posts: 7
FYI: This is what it looks like:
http://www.youtube.com/watch?v=o3bPlWmetq8

Re: BSA B25 Points Cam [Re: crankbuster] #507688
09/24/13 8:53 am
09/24/13 8:53 am
Joined: Oct 2008
Posts: 1,658
Canada
L
LarryLebel Offline
BritBike Forum member
LarryLebel  Offline
BritBike Forum member
L
Joined: Oct 2008
Posts: 1,658
Canada
Electronic ignition will 'transform' the running of your motor. I am more than happy with the Wassell unit I have in my B44.

Re: BSA B25 Points Cam [Re: LarryLebel] #507695
09/24/13 9:15 am
09/24/13 9:15 am
Joined: Sep 2013
Posts: 14
Nashville, TN
W
wkoenig Offline OP
BritBike Forum member
wkoenig  Offline OP
BritBike Forum member
W
Joined: Sep 2013
Posts: 14
Nashville, TN
I understand that electronic ignition is the way to go, but I was hoping to avoid the cost and effort. As far as effort, how difficult/time consuming was the Wassell installation? This is my first rodeo with a Brit bike.

And how does the Wassell stack up against the other EI's?

Re: BSA B25 Points Cam [Re: wkoenig] #507705
09/24/13 12:26 pm
09/24/13 12:26 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
BritBike Forum member
triton thrasher  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,026
scotland
The simple path is to replace the springs, if there's something wrong with them.

If you convert to electronic, you may end up buying expensive electrical improvements, to keep the ignition satisfied. That's maybe something to consider at your leisure, after you have a few rides on the bike.


Amateur Loctite enthusiast.
Re: BSA B25 Points Cam [Re: wkoenig] #507716
09/24/13 2:45 pm
09/24/13 2:45 pm
Joined: Sep 2013
Posts: 14
Nashville, TN
W
wkoenig Offline OP
BritBike Forum member
wkoenig  Offline OP
BritBike Forum member
W
Joined: Sep 2013
Posts: 14
Nashville, TN
OK, I've removed the points plate and the auto advance springs are in place, they just don't have enough tension to return the cam to the retarded position. I've removed the cam and springs, but the AAU plate is stuck solid. Will I need a puller to remove it? At this point, do you think new springs will help?

Re: BSA B25 Points Cam [Re: wkoenig] #507719
09/24/13 3:05 pm
09/24/13 3:05 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
BritBike Forum member
triton thrasher  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,026
scotland
Do you have no manual?


Amateur Loctite enthusiast.
Re: BSA B25 Points Cam [Re: wkoenig] #507720
09/24/13 3:07 pm
09/24/13 3:07 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
BritBike Forum member
triton thrasher  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,026
scotland
If the cam is not stiff on the shaft, the springs usually pull it back to the retarded position with the engine stopped, at least when the points heel is not rubbing on the cam.


Amateur Loctite enthusiast.
Re: BSA B25 Points Cam [Re: triton thrasher] #507740
09/24/13 6:12 pm
09/24/13 6:12 pm
Joined: Sep 2013
Posts: 14
Nashville, TN
W
wkoenig Offline OP
BritBike Forum member
wkoenig  Offline OP
BritBike Forum member
W
Joined: Sep 2013
Posts: 14
Nashville, TN
The cam was not stiff on the shaft but the springs are too weak to provide any tension. I found some new auto advance springs on Eurotrash for $11 and will try those. if that doesn't do the trick it's time for an electronic ignition, probably Tri-Spark because of its ease of installation.

Re: BSA B25 Points Cam [Re: wkoenig] #507780
09/25/13 1:14 am
09/25/13 1:14 am
Joined: Oct 2008
Posts: 4,875
Gnashville
DavidP Online content

BritBike Forum member
DavidP  Online Content

BritBike Forum member
Joined: Oct 2008
Posts: 4,875
Gnashville
PM sent


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
Re: BSA B25 Points Cam [Re: DavidP] #507806
09/25/13 10:56 am
09/25/13 10:56 am
Joined: Oct 2008
Posts: 1,658
Canada
L
LarryLebel Offline
BritBike Forum member
LarryLebel  Offline
BritBike Forum member
L
Joined: Oct 2008
Posts: 1,658
Canada
I would think installation of all the EIs is more or less the same. Most of the time is required to mount the black box some where (tool box in my case on my B44) and wire it up to the battery and run the trigger wires through the side case. You'll wire crimpers or a solder gun for this.

Re: BSA B25 Points Cam [Re: wkoenig] #507941
09/26/13 11:19 am
09/26/13 11:19 am
Joined: Sep 2006
Posts: 85
Wales
R
Ray Smith Offline
BritBike Forum member
Ray Smith  Offline
BritBike Forum member
R
Joined: Sep 2006
Posts: 85
Wales
My advice would be to stop messing with points and mechanical advance and retard.
I ran my B25 for a couple of years with points and auto advance unit.It was ok but the bike was at times difficult to start,often kicked back.Deciding I had to get it right I strobed the timing and found it to be all over the place.Messing with the points and auto unit brought little improvement.
On advice from others I fitted a Pazon unit.
The improvement is immense 1:- Guaranteed first kick starting (hot or cold engine) 2:-Better and reliable tickover. 3:-Better driving not always changing gear to keep the bike on the boil. 4:-Much improved fuel consumption. 5:-No longer eats plugs.6:-The bike is a lot more fun to ride
Best 97 I have ever spent on a bike

Re: BSA B25 Points Cam [Re: wkoenig] #507975
09/26/13 3:06 pm
09/26/13 3:06 pm
Joined: Feb 2007
Posts: 586
California
Don M. Offline
BritBike Forum member
Don M.  Offline
BritBike Forum member
Joined: Feb 2007
Posts: 586
California
I had the same experience with my 441 BitSA with the early, replacable pilot jet carb. After carefully adjusting the points & timing I could get the bike to start well--For awhile, then it would regress to the multi-kick mode. After installing a Pazon unit & adjustable throttle stop it consistantly starts 2 or three kicks cold & 1 when warm. The Pazon is better than some of the older electronic ignitions as it has the same advance curve as original. The old 2 step is OK for high revving twins that spend most of the time in the upper rev range but big singles spend much of their time at the low end, just chugging along. Cheers, Don.

Re: BSA B25 Points Cam [Re: Don M.] #508511
10/01/13 12:10 am
10/01/13 12:10 am
Joined: Sep 2013
Posts: 14
Nashville, TN
W
wkoenig Offline OP
BritBike Forum member
wkoenig  Offline OP
BritBike Forum member
W
Joined: Sep 2013
Posts: 14
Nashville, TN
So I replaced the Auto Advance Unit springs and this added sufficient tension to return the AAU cam to the retarded position. Not a lot of tension, but 100% better than before.

We'll see if this does the trick after I have a chance to time and reset the points and test drive the bike. Hope this $10 fix works well enough or else I'm going to install a Pazon unit.


Moderated by  Allan Gill, Jon W. Whitley 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.1.1