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June 27th, 2007, 11:37 PM   #1
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ignition timing - your thoughts?

how many of you have used a strobe to set the ignition timing and if so which and what line did you go to?

did you half the figures as suggested by lineaweaver?

did you try full advance or just at idle?

i've found that this doubling figure screws with the RPM and the advance degrees. i hate it!

anyway, your ideas?

amazing how dealers never join in isn't it?

regards

Taffy
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June 28th, 2007, 08:01 AM   #2
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amazing how dealers never join in isn't it?
they're too busy adjusting valves and changing oil this time of year.
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June 28th, 2007, 09:41 AM   #3
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Re: ignition timing - your thoughts?

Originally Posted by Taffy
how many of you have used a strobe to set the ignition timing and if so which and what line did you go to?

did you half the figures as suggested by lineaweaver?

did you try full advance or just at idle?

i've found that this doubling figure screws with the RPM and the advance degrees. i hate it!

anyway, your ideas?

amazing how dealers never join in isn't it?

regards

Taffy
Hi taffy,

I have made some crude mapping of the 2000 Husaberg ignition timing.

You must have a dial back strobe with an inductive pickup. The one I use is a Craftsman model 21023. It is adjustable from 0 deg up to 65 deg. This permits you to measure the exact number of degrees of delay it takes to adjust the strobe to fire when the flywheel TDC mark is in the inspection window on the Husaberg.

On the Husaberg there are 2 flywheel pulse magnets and the single pole trigger pulse coil. It operation as the center of the gap between the 2 magnets on the flywheel passes the trailing edge of the trigger pulse coil lamination stack 40 crank shaft degrees before TDC wave form triggers the CDI timing circuit to time out. The CDI delays the spark for 25 crank shaft degrees starting and at idle firing the plug 15 degrees before TDC , but then gradually advances the spark 15 degrees more to a total of 30 degrees before TDC at ~ 3200 rpm.

In summary, it seems as if the the wave form as the center of the gap between the 2 magnets just passes the trailing edge of the lamination at 40 degrees before TDC triggers the CDI timing circuit . The timing circuit delays the spark for 25 degrees ( fires plug at 15 degrees BTDC) during starting and up to idle speed (1600 to 1800 rpm). Then from idle up to ~ 3250 rpm the circuit gradually reduces the delay an additional 15 degrees such at 3250 rpm the plug is firing at 30 degrees BTDC.

The SEM stator is adjustible on the 2000 Husaberg and is indexed at the SEM factory to enable correct adjustment to be Mechanically set to 40 crankshaft degrees before TDC.

I was alone during this test and could not manage a detailed mapping curve, but then your question was how to set the static timing so this should help.


Joe
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June 28th, 2007, 12:14 PM   #4
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Re: ignition timing - your thoughts?

Interesting that Joe all the one's I have up on the rig the timing stays pretty much static until around 3500 3700 rpm then you start to get the advance curve.
There is also a small amount of retard in there as well just before it starts it's final advance.
Unless the 501 cdi has a different curve to the rest or it's because I have not run a 501 system.

Regards

Sparks.
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June 28th, 2007, 12:19 PM   #5
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RE: Re: ignition timing - your thoughts?

cheers joe

i have two sanp on strobes my late father left me a turn knob and i have a digital which i used to hate but have learnt to love!

i measured the timing on this particular bike as 70btdc but retarded the ignition down to 45 btdc which is as far retarded as the stator can be turned. so i either have 22d or 45d? one thing i can say is that the bike goes like snot - it's very quick! but alas the speedo is defunct so ..... impressions , impressions!!!

the flywheel mark for TDC was out by 10 degrees and in order to get the ignition timing right i have had to turn the stator CW to it's limit.

regards

Taffy
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June 28th, 2007, 01:19 PM   #6
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Re: ignition timing - your thoughts?

Originally Posted by sparks
Interesting that Joe all the one's I have up on the rig the timing stays pretty much static until around 3500 3700 rpm then you start to get the advance curve.
There is also a small amount of retard in there as well just before it starts it's final advance.
Unless the 501 cdi has a different curve to the rest or it's because I have not run a 501 system.

Regards

Sparks.
Hi Steve, Taffy.

I forgot to mention that my 2000 is a FE501E.

Taffy, I am willing to bet that your 400 CDI is more radical than my 501.

Regards,

Joe
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June 28th, 2007, 01:23 PM   #7
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RE: Re: ignition timing - your thoughts?

hey joe (sorry - couldn't resist that hendrix starter!)

this is a 650 this time but i reckon tomorrow night i'm going to run through the timing of my bike and the 650. i thought that the 400 got extra revs perhaps but nothing else, least that's what other manufacturers do on their bikes.

more later.

regards

Taffy
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June 29th, 2007, 07:51 AM   #8
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Taf, the strobe delay might be scaled for non waste spark ignitions. Doesn't matter which if you eleminate the source of confusion, the delay.
Put a mark on the flywheel at tdc. Measure and mark the flywheel at 45 deg before the tdc mark. Do the same at 70.
If you are at 45 deg you will strobe at your 45 deg mark. If it flashes at the 70 mark your at 70.
Or you can make more marks, but the idae is the same. But don't use a delay strobe unless you are familiar with the delay. That's the experience. (sorry - couldn't resist that hendrix ending!)
Regards
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