Ignition timing

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mawsy
Posts: 86
Joined: 12th January 2012 - 9:09pm

Ignition timing

Post by mawsy » 5th February 2018 - 12:09pm

Hi all having a nightmare setting up timing on my 72 square, was running then started missing and popping changed dizzy to electronic acuspark , with new coil, no better , process of elimination found starter bush had failed, replaced and had starter reconditioned, at last problem sorted. Set up timing light started on button timing spot on , had cup of tea returned and started again , spot on with timing light. Tightened dizzy holding clamp tried to start no joy , will pop and fart but not run. Help please cheers Mawsy :

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purplepeter
Posts: 2031
Joined: 8th August 2006 - 4:41pm
Location: Bath,Avon/Corsham,wilts

Re: Ignition timing

Post by purplepeter » 5th February 2018 - 1:03pm

Depending on how much You've loosened the clamp, its perfectly possible for the dissy to move whilst running/cranking- Start again & tighten the clamp as soon as You're happy with it, or loosen it so you can only just move the body

mawsy
Posts: 86
Joined: 12th January 2012 - 9:09pm

Re: Ignition timing

Post by mawsy » 5th February 2018 - 1:13pm

Have tried turning dizzy to no effect, just hoping electronics not kaput

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937carrera
Posts: 667
Joined: 7th June 2013 - 11:54pm
Location: North Yorkshire

Re: Ignition timing

Post by 937carrera » 5th February 2018 - 4:01pm

mawsy wrote:
5th February 2018 - 12:09pm
Tightened dizzy holding clamp tried to start no joy , will pop and fart but not run. Help please cheers Mawsy :
Looks like you disturbed something when tightening. Have a look round if you could have disturbed a connection, otherwise, back to basics, use a spare plug and see if you still have a spark.

It is unlikely that something else has failed......but that means it is still possible, check daft stuff as well, you still have fuel ?
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon

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broady_6
Posts: 1433
Joined: 13th January 2009 - 9:55pm

Re: Ignition timing

Post by broady_6 » 5th February 2018 - 8:13pm

Could be more simple than that, the dissy can ride up while its loose. If its too loose you may find its come up enough for the drive dogs to disengage. Take the dissy cap off and get someone to crank it and see if the arm is going roundy round.
The sultan of swing

mawsy
Posts: 86
Joined: 12th January 2012 - 9:09pm

Re: Ignition timing

Post by mawsy » 7th February 2018 - 4:05pm

Hi again noticed dizzy rotor turning intermittently, removed dizzy machined 2 mm to allow deeper drop, running a bit ough will fit strobe and sort it hopefully cheers all Mawsy

mawsy
Posts: 86
Joined: 12th January 2012 - 9:09pm

Re: Ignition timing

Post by mawsy » 8th February 2018 - 11:22pm

Sorted now cheers all Mawsy

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937carrera
Posts: 667
Joined: 7th June 2013 - 11:54pm
Location: North Yorkshire

Re: Ignition timing

Post by 937carrera » 9th February 2018 - 2:03am

What was the final solution then - so we all learn ? :)
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon

mawsy
Posts: 86
Joined: 12th January 2012 - 9:09pm

Re: Ignition timing

Post by mawsy » 23rd May 2018 - 10:53am

Final solution to dizzy problem was to go back to vaccum advance dizzy as the electronic in my experience was pants, running better now but left hand carb not accellerating, will take off and investigate cheers Mawsy

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