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Best ignition advance #688704
03/20/17 2:23 am
03/20/17 2:23 am
Joined: May 2009
Posts: 288
Omaha, NE, USA
Paul Sammut Offline OP
BritBike Forum member
Paul Sammut  Offline OP
BritBike Forum member
Joined: May 2009
Posts: 288
Omaha, NE, USA
Hi all,
I am replacing the magneto with an electronic BTH unit on my Series C Rapide. The instructions make no mention as to the appropriate timing in a specific number of degrees BTDC. Given current fuels, what is the most appropriate "fully advanced" number of degrees I should use to time my engine, please? Should this be different for the BTH unit? I should probably have asked John Healy when I bought it, but I'm hoping he's watching this list, anyway. John?
Thanks in advance


Paul

'74 Commando
'15 R1200 GS Adv
'51 Vincent Rapide
'58 Ariel Square Four
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Re: Best ignition advance [Re: Paul Sammut] #688760
03/20/17 2:22 pm
03/20/17 2:22 pm
Joined: Aug 2010
Posts: 318
New Hampshire, USA
David Dunfey Offline
BritBike Forum member
David Dunfey  Offline
BritBike Forum member
Joined: Aug 2010
Posts: 318
New Hampshire, USA
Paul,

I am not sure what John would recommend, but I set the ignition advance on the dyno, which is not much help to you, at the moment. I think BT-H wants you to rely on the Factory specs for ignition timing. This would be listed in Richardson. From memory, it is somewhere around 36°. Many owners have remarked that modern fuels like more retard of at least a few degrees. I think 32° would be fine.

I would use the piston stop method to determine TDC. The BT-H uses a 6 mm rod to mark the point where the timing should occur. When you have set the timing, make sure that after you insert the rod you put the bike in gear and nudge the rear wheel in the direction of forward motion until the rod is tight in the mag. With all of the slack is removed see where the degree wheel is. The point of taking the slack out is that when you slip the rod into the mag it is not a tight fit and the mag can move a few degrees in either direction. By making sure the rod is tight by gently moving the wheel in a forward direction you will be consistent about where you set the timing.

David

Re: Best ignition advance [Re: David Dunfey] #688834
03/21/17 3:37 am
03/21/17 3:37 am
Joined: May 2009
Posts: 288
Omaha, NE, USA
Paul Sammut Offline OP
BritBike Forum member
Paul Sammut  Offline OP
BritBike Forum member
Joined: May 2009
Posts: 288
Omaha, NE, USA
As always, David, you're enormously helpful. Thank you so much. I Have the Richardson book, but the timing it recommends varies by piston make. I have no idea what that is in my bike, so hence my question. I will start at around 36 or 34 deg and rotate the "magneto" to fine tune it.


Paul

'74 Commando
'15 R1200 GS Adv
'51 Vincent Rapide
'58 Ariel Square Four
Re: Best ignition advance [Re: Paul Sammut] #689311
03/25/17 1:30 pm
03/25/17 1:30 pm
Joined: Feb 2007
Posts: 2,230
Atlanta, GA USA
S
Semper Gumby Offline
BritBike Forum member
Semper Gumby  Offline
BritBike Forum member
S
Joined: Feb 2007
Posts: 2,230
Atlanta, GA USA
So you can ride it to the TSMR right!

😉👍


Gaggle of BSAs
a Honda
an old BMW
and a Montesa
Parking lot Elf in training
Re: Best ignition advance [Re: Semper Gumby] #689321
03/25/17 4:18 pm
03/25/17 4:18 pm
Joined: May 2009
Posts: 288
Omaha, NE, USA
Paul Sammut Offline OP
BritBike Forum member
Paul Sammut  Offline OP
BritBike Forum member
Joined: May 2009
Posts: 288
Omaha, NE, USA
I'd love to, Semp, but there is a conference in D.C. at the same time at which I have a commitment. I'm unhappy about that.
Hope you and your R3 have a great time, anyway.


Paul

'74 Commando
'15 R1200 GS Adv
'51 Vincent Rapide
'58 Ariel Square Four

Moderated by  John Healy 


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