How A CDI Works (Gen 1) - Page 4 - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #31 of 34 Old 09-22-2014, 10:29 PM
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Damocles,
Your welcome.
But, why didn't you move this camshaft discussion to another thread?

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post #32 of 34 Old 09-23-2014, 01:12 AM
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One question I had earlier was how can an analog CDI provide an advance curve? One answer I ran across on the all knowing Internet--use an "all pass" analog filter.

Ideal All Pass filters (as I was reminded by my papyrus copy of "Signals & Systems") don't attenuate signals, they just delay signals (shift phase) as a function of signal frequency. E.g. As the RPM goes up, the timing signal gets shifted.

AP filters can be made from a nightmarish combination of a ladder of RC filters and/or a network of choke coils (inductors).

Now I really, really want to cut a CDI apart

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post #33 of 34 Old 09-23-2014, 06:29 AM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
Damocles,
Your welcome.
But, why didn't you move this camshaft discussion to another thread?
I addressed the quoted comment from this thread, pdwestman:

Quote:
Originally Posted by Normk:

A simple advance of the exhaust cam, re-jetting and remapping of the ignition advance should improve things.
I've wondered how advancing the exhaust cam (only) increases power output.

No objection to discussing the issue in another thread, or . . . NOT discussing the issue in another thread!
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post #34 of 34 Old 09-23-2014, 06:43 AM Thread Starter
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Quote:
Originally Posted by UncleWray View Post
One question I had earlier was how can an analog CDI provide an advance curve? One answer I ran across on the all knowing Internet--use an "all pass" analog filter.

Ideal All Pass filters (as I was reminded by my papyrus copy of "Signals & Systems") don't attenuate signals, they just delay signals (shift phase) as a function of signal frequency. E.g. As the RPM goes up, the timing signal gets shifted.
My guess also at the spark advance technique, Uncle Wray. The "signal frequency," relating to the pulse rate from the pickup coil, a function of engine rpm.

If so, a simple module could be crafted by a competent electronics technician to alter the spark advance curve, I'd think.

Hey, FREE POWER! Advance your KLR650 spark timing! He'd sell a million of 'em, and . . . some valid, demonstrable, repeatable power increase might actually be available from tweaking the ignition map. (Might have to use high-octane gasoline to reap this bounty (avoiding pinging, "knock"); true KLRistas would not like to pay extra for the high-test fuel! ).

Last edited by Damocles; 09-23-2014 at 06:46 AM.
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