The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: Hubie on 04.03. 2010 11:02

Title: Timing adjustment
Post by: Hubie on 04.03. 2010 11:02

Hi all,

Just wondering as I have not done it on this bike before, how to adjust the timing on an a10 flash.  It is too far retarded and needs to be advanced up.  It is the reason for my lack of top end go.

Cheers

Hubie.

Title: Re: Timing adjustment
Post by: Goldy on 04.03. 2010 18:11

http://www.britishonly.com/pdf/bsa/sectionA_BSAservicesheetno203.pdf                                                                                       The main thing is to take your time. If you get it right first time then you will be lucky. All the best

Title: Re: Timing adjustment
Post by: a10 gf on 04.03. 2010 19:14

btw, the manuals are here (http://www.a7a10.net/forum/index.php/topic,454.0.html), the service sheets here (http://www.a7a10.net/forum/index.php/topic,1475.0.html), Lucas Manuals here (http://www.a7a10.net/lucasmain.htm), Search tips are here (http://www.a7a10.net/forum/index.php/topic,1352.0.html).

Good luck, you'll soon get your ignition timing perfect.
e

Title: Re: Timing adjustment
Post by: Hubie on 05.03. 2010 05:27

Thanks so much for the info, it's definately the cause of my lack of go at the top end.  I have a mate who runs a shop here in Oz who did his apprenticeship with Triumph in the UK 40 years ago and knows brit bikes very well.  He told me when I went there lastnight following a tyre blowout that my timing was too far retarded so it is time to sink my teeth into it and correct the problem.

The difference in power and torque between my flash and my super meteor is massive at the moment and it should not be so obvious.

Cheers

Hubie

Title: Re: Timing adjustment
Post by: muskrat on 05.03. 2010 14:18

The Flash shouldn't be too far behind the Meteor. Mine argues with an Atlas. Might have to take some of your own medicine re pinging thoughts.
Cheers mate.

Title: Re: Timing adjustment
Post by: Hubie on 07.03. 2010 11:11

Reset the timing tonight, thanks to the instructions given it wasn't a difficult job.  Set it to the factory reccomended 11/32 btdc with the points just starting to open.  Fired into life immediately but will have to wait to ride it as it is 10pm here and we've had massive hailstorms.  Both of my cars appear written off.

Will report on the progress and thanks to all for the great advice.

Hubie.

Title: Re: Timing adjustment
Post by: a10 gf on 07.03. 2010 12:01

Thanks for the feedback, always nice to read about good results and a running engine.
(but sorry for the car mishaps!)

Title: Re: Timing adjustment
Post by: dpaddock on 07.03. 2010 21:59

Both cars "written off" - yowch!

David

Title: Re: Timing adjustment
Post by: Hubie on 08.03. 2010 06:15

Now all I need to know is which direction advances the timing, nearer to TDC or more BTC.  Will need this in case I need to advance it more.  At least it is easier to adjust than my super meteor!

Title: Re: Timing adjustment
Post by: muskrat on 08.03. 2010 07:20

G'day Hubie,
                 Shame about the cars, hope they were insured.
To advance the cam ring needs to go in the opposite direction to the points plate spinning. If you only want to go a little opening the points advances and closing retards. One thou is about two degrees of timing.
Advancing means the spark happens earlier. eg 3/8" btdc is more advanced than 5/16"btdc.
Cheers

Title: Re: Timing adjustment
Post by: Hubie on 08.03. 2010 07:52

Thanks muskrat,

So the more btdc, the more advanced.  Now I just have to ride her!

Title: Re: Timing adjustment
Post by: Hubie on 13.03. 2010 08:41

Finally got the chance to take her out.  With iridium plugs and reset timing, goes like a cut cat compared to before.  Much happier.

Cheers

Hubie.

Title: Re: Timing adjustment
Post by: Hubie on 20.03. 2010 22:21

Now that I have the timing sorted, I've also reverted to more original carb settings as my plugs were quite black.  Dropped from a 270 main jet to a 210 (manual says 170 but I don't have one) and the needle clip is in number 1 position.  Will see how it goes, at least I am having fun!

Cheers

Hubie

Title: Re: Timing adjustment
Post by: Hubie on 21.03. 2010 05:15

Now goes like a cut cat without being over rich.  Happily have it sorted now and loads of torque, plenty of power left at 60mph.

Cheers for the help and advice.

Hubie.