CB500K1 ignition timing conundrum

[AndyH]

Prior to going on a nice ride last weekend, I decided to check the timing using a strobe light.
My ignition system is Dyna S.
Once the bike was warmed up, I checked the idle (~1000rpm) timing and it was at the 1.4 F /2.3 F marks.
However at 2500rpm and above the | | timing marks were not lining up with the outside mark, instead about 5mm (3/16") to the left of the outside mark.
I think I'm missing something fundamental here.....
Can those far more experienced than me please help!

[Johnwebley]

I don't have experience with Dyna.But I use Boyer.
They recommend timing by strobe at 4500rpm.at full advance

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[AndyH]

I don't have experience with Dyna.But I use Boyer.
They recommend timing by strobe at 4500rpm.at full advance

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John I revved up to 7000+ and still the same advance.

[K2-K6]

With a simple/static strobe gun you should see the timing moving as you rev it.  The advance mech should bring the timing mark earlier on the scale as you rev it. So you won't see it stay in the same place.

Non static guns have facility in which you can set the advance you expect to get at maximum,  then when you rev it it should show still at same F point.
The gun runs an offset to compensate for the desired advance,  if that makes sense.

[Johnwebley]

Set it at full advance. That is normally the best way.
Have you got the set up instructions?
Otherwise try to find them online

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[Bryanj]

Not sure about your description, do you mean that both advance marks on the advancer were to the left of the static mark(extra advance) or to the right of the static mark(insufficient advance).

[AndyH]

Not sure about your description, do you mean that both advance marks on the advancer were to the left of the static mark(extra advance) or to the right of the static mark(insufficient advance).

Both marks were to the left of the static marker.

[Bryanj]

In that case you need to set the timing when running at full advance between the marks as you are running with too much advance for standard engine and will cause damage

[kevski]

They really are a piece of cake to install, here is the link to their instructions.
http://www.dynaonline.com/skins/downloads/instruct/DS1-1_1-2.pdf

[AndyH]

In that case you need to set the timing when running at full advance between the marks as you are running with too much advance for standard engine and will cause damage

That's exactly what I've done Bryan for that exact reason.  Any idea why full advance would be higher than expected?

They really are a piece of cake to install, here is the link to their instructions.
http://www.dynaonline.com/skins/downloads/instruct/DS1-1_1-2.pdf

Thanks Kev but the Dyna has been installed for some years now and was originally set up as per the install notes.
This recent anomaly is why I posed the initial question.

[deltarider]

Not sure about your description, do you mean that both advance marks on the advancer were to the left of the static mark(extra advance) or to the right of the static mark(insufficient advance).

In that case you need to set the timing when running at full advance between the marks as you are running with too much advance for standard engine and will cause damage

Bryan, his doesn't advance enough. Below a pic of the advancer. Andy, please describe your strobe. Is it a normal one or one where you can dial the expected advance (which may lead to errors!)? If the latter, make sure to zero the adjust. From what I've read here: when at idle (around a true 1000-1100 rpm) it flashes on the 'F' mark and when over a known 3000 rpm does not reach the II advance marks, it would indicate to me the advancer doesn't work as it should. Unless your inductive strobe is somehow fooled by interference. Now I've heard of EI's that, when fitted, somehow blocked the advancer, by a bolt that protruded too far or something similar. Check the back side of the plate and if a bolt sticks out that could limit the movement of the advancer, replace that bolt by a shorter one or add washers under the head of that bolt.
A checklist in general. Did you have the inductive pickup clamp positioned correctly? This because polarity can play a role. When in doubt: ignore 'THIS SIDE TOWARDS PLUG' and flip the clamp or have it as you had, but then on the other corresponding plugwire (same coil). Also it wouldn't hurt to have the strobe powered by an external battery. Please report back.

[Bryanj]

Hang on mate, crank turns clockwise and on full advance the marks are to the left of static mark so that means it is firing before it should so its too advanced.
I know this because many years ago we built a Yoshi 500 and in the instructions it said give extra advance and we were timing it between the advance marks and the spring pillar.

[deltarider]

I know, but I took the liberty to interpret what Andy wrote in the other direction, him living on the other side of the equator. 

[Bryanj]

You know i missed that bit, surely that would make it upside down not back to front?

[deltarider]

But... hang on... with you lot driving on the opposite side of the road, isn't it your models CB have the ignition on the LH side of the bike then?