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E: Engine Comet Ignition Timing 2018


vibrac

Well Known and Active Website User
VOC Member
It seems ok but it is a messy job Ben has just sent one away to the current manufacturers for a checkup he is not too far from us came back checked and sorted about £45 that's what I will do next time he has all the gear and it's not a long job like a magneto done in a week
 

Normski

Well Known and Active Website User
VOC Member
It seems ok but it is a messy job Ben has just sent one away to the current manufacturers for a checkup he is not too far from us came back checked and sorted about £45 that's what I will do next time he has all the gear and it's not a long job like a magneto done in a week
That's good to hear, I was hoping they did a check/ recondition service but only got the answerphone yesterday, hopefully they'll call back today.
 

Chris Launders

Well Known and Active Website User
VOC Member
Last year mine started missing on one cylinder then lost that spark completely, sent it off and it was back in less than a week, one CDI unit had failed, also he found front cylinder was 5 degrees out so it needed a new back plate which was extra. This one was at least ten years old and had done over 15 k
 

Normski

Well Known and Active Website User
VOC Member
Spoke to them yesterday and have sent the unit to them. Nice people to deal with. I bought my Alton from them backalong, a fair bit cheaper than VOC spares.
 

Nigel Spaxman

Well Known and Active Website User
VOC Member
My Take on timing is that
1) The ATD is a pretty primitive device and I think the factory recommendations were a compromise to deal with what they had.
2) Many modern devices have a fixed advance curve that is a "best guess" at what the engine needs.

I have been running a 2 stage Harley setup for some 20+ years. I set it when I first installed it by an initial advance of about 34 degrees although really can't recall how I did that. I then took it for a ride. Tried to make it detonate and couldn't
Advanced it a little on the adjustable trigger plate. Still no issues.
Repeat
Repeat - Ahh funny noises when lugged hard in higher gears.
Turn back a little.

leave alone for more than 20 years...... Change the plugs once a decade, if I remember.

When it was installed I think we surmised that at higher RPM it was reaching as much as 50 deg advance... with not too much throttle, and when the throttle was wicked open it switches to a more retarded curve.

I suppose it would be more useful if I put my Herve Hamon timing disk on and actually checked to see where it all was.

As for the Flash calling for 42 I wonder if that was an adjustment in the compromise knowing that it would be revving higher generally than a street Comet at 38??

How's that for comments providing no real world use to anyone!
 

Nigel Spaxman

Well Known and Active Website User
VOC Member
Robert I have read various comments about your ignition system on Woolly. I have pretty much the same thing on my bike. I didn't know you had a Herve Hamon timing disk! I have a really nice strobe light that works with that ignition really well. We should find out what you have been doing for the last 20 years. I have experimented a lot over the last few years. My bike has 8:1 pistons and it is so soft that it never detonates. I have been using timings around 34 degrees full advance. I have found it can tolerate full advance at very slow speeds. I have thought of experimenting with the VOES and using a full advance timing at high vacuum of up to 45 degrees and then having it go back to 34 with less vacuum. I think that might be what yours is doing. I have the programing cable for the dyna ignition so I have been experimenting with different curves. I can strobe time my bike through the ATD hole with some marks on the nylon gear that drives the ignition.
 

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