Why did KLR change from CDI to TCI? - Kawasaki KLR 650 Forum
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post #1 of 2 Old 07-01-2019, 10:56 AM Thread Starter
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Join Date: May 2019
Location: Lake Macquarie, NSW, Australia
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Why did KLR change from CDI to TCI?

Anybody got the answer for this? Most of the other Gen1- Gen2 changes seem to have an obvious reason, either engineering or marketing. I'm curious as I never heard of a problem with the Gen1 CDI system which justifies the change.

For what it's worth, I'm wondering if it might be to improve the emission performance. This is purely a guess based on the fact TCI has a stronger spark at low revolutions.

Anybody know the real reason or want to provide an alternative theory?

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post #2 of 2 Old 07-01-2019, 12:02 PM
Pretty in Pink, dunno why
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I've no idea. I think it was a step backward and have installed a Gen 1 ignition on my Gen 2. The TCI has pretty much the same hokey advance curve and lack of tunability that the CDI had. Of course, you need to have at least a mostly-dead-but-but-not-totally-dead battery in place to push start the thing. Enough voltage, mebbe 9ish volts, is enough to get the TCI to make spark so you can push start it.

By changing the ignition they were able to eliminate the two exciter coils, replacing them with charging coils. That, and a change to the rotor style, increased the electrical output of the alternator. The number of poles was not increased but the rotor has a higher flux density. Putting the charging coils in probably smoothed out the three-phase output and makes for a cleaner DC voltage, though I've never scoped it.

There's some info on the charging systems here: https://www.souperdoo.com/stuff%20th...nges-over-time
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Last edited by Tom Schmitz; 07-01-2019 at 12:04 PM.
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