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Zxr 400 l no spark

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zxrdonny
L Plate Warrior



Joined: 18 Dec 2014
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PostPosted: 21:41 - 18 Dec 2014    Post subject: Zxr 400 l no spark Reply with quote
Hi I have zxr 400 with 2 live wires on each coil should the both be live ??
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CaNsA
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Joined: 02 Jan 2008
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PostPosted: 23:37 - 18 Dec 2014    Post subject: Reply with quote
Join the ZXR forum.

https://www.zxrworld.co.uk/zxr400oc/index.php

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Taught2BCauti...
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Joined: 12 Jan 2012
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PostPosted: 11:11 - 19 Dec 2014    Post subject: Reply with quote
Both sides of each coil go to the CDI unit, so don't expect a true reading from a volt-meter.

You can test the coils off the bike with an Ohm-meter or with 12V DC, but your problem is most likely to be with the CDI unit.
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zxrdonny
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Joined: 18 Dec 2014
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PostPosted: 14:06 - 19 Dec 2014    Post subject: Reply with quote
Taught2BCautious wrote:
Both sides of each coil go to the CDI unit, so don't expect a true reading from a volt-meter.

You can test the coils off the bike with an Ohm-meter or with 12V DC, but your problem is most likely to be with the CDI unit.
. Changed Cdi the 2 wire on each side have live feeds does the coil earth off bolts that hold it in place cheers
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Taught2BCauti...
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PostPosted: 14:14 - 19 Dec 2014    Post subject: Reply with quote
Neither of the terminals on the coils go directly to earth, but disconnect the wires from the coils and test both coils with an ohm-meter.
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zxrdonny
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Joined: 18 Dec 2014
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PostPosted: 14:22 - 19 Dec 2014    Post subject: Reply with quote
Taught2BCautious wrote:
Neither of the terminals on the coils go directly to earth, but disconnect the wires from the coils and test both coils with an ohm-meter.
. Will do I put coil on off other bike but al try testing them . Cheers al write let u know . It's jst a pain bike was going fine
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zxrdonny
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Joined: 18 Dec 2014
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PostPosted: 16:57 - 19 Dec 2014    Post subject: Reply with quote
Vincent wrote:
All the HT caps OK? They can wear with vibration where they join at the plug sometimes.
. All fine mate it was the 4 live wires I didn't get . Bike was fine aswell replaced Cdi with one with same numbers yellow l one prob restricted lol
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zxrdonny
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Joined: 18 Dec 2014
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PostPosted: 17:57 - 19 Dec 2014    Post subject: Reply with quote
Vincent wrote:
Sorry, can't help with the coil leads, does the bike run at all...on two cylinders for eg?
. No not even a puff o smoke . Took pick up cover off chain in all still in tack . Really a jst didn't understand the4 live wires but if that what it's ment 2 be like good stuff . A thought it had short
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Taught2BCauti...
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PostPosted: 10:41 - 20 Dec 2014    Post subject: Reply with quote
3 possibilities - faulty coils, faulty CDI, or faulty sensors (assuming all the wiring, HT leads and plugs are good).

It is easy to test the coils, by disconnecting the wires from the CDI unit, and checking the readings with an ohm-meter.

When coils fail they usually fail open-circuit, and this is easy to see with an ohm-meter set to a low range.

You can also test them by disconnecting the wires from the CDI unit and connecting 12v DC across the coil. You should get a spark at the plug when you disconnect one of the wires.

Testing the sensors and CDI unit is not so easy, but most of the CDI's I have worked on, do not put a voltage out to the coils if the engine is not turning.

Best method is substitution with a known good unit from a working bike, as replacing it with one off eBay - or even a brand-new one from a dealer - doesn't guarantee it is any better than the one you already have.
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zxrdonny
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Joined: 18 Dec 2014
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PostPosted: 20:45 - 15 Jan 2015    Post subject: Reply with quote
Taught2BCautious wrote:
3 possibilities - faulty coils, faulty CDI, or faulty sensors (assuming all the wiring, HT leads and plugs are good).

It is easy to test the coils, by disconnecting the wires from the CDI unit, and checking the readings with an ohm-meter.

When coils fail they usually fail open-circuit, and this is easy to see with an ohm-meter set to a low range.

You can also test them by disconnecting the wires from the CDI unit and connecting 12v DC across the coil. You should get a spark at the plug when you disconnect one of the wires.

Testing the sensors and CDI unit is not so easy, but most of the CDI's I have worked on, do not put a voltage out to the coils if the engine is not turning.

Best method is substitution with a known good unit from a working bike, as replacing it with one off eBay - or even a brand-new one from a dealer - doesn't guarantee it is any better than the one you already have.
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Old Thread Alert!

The last post was made 11 years, 265 days ago. Instead of replying here, would creating a new thread be more useful?
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