LTZ 400 current problems? - Suzuki Z400 Forum : Z400 Forums
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post #1 of 16 (permalink) Old 04-10-2018, 07:21 PM Thread Starter
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LTZ 400 current problems?


This happens when the engine is hot after riding in slow speed for 20-25 mins.
If the engine is hot and it is riding in high speeds it don't do this.
When the engine is back cool it would start right back up and act normally like nothing ever happened. My spark plug is fine but i am getting a very very weak spark.

I do not think it is overheating because my fan comes on and the temperature light does not come on . I use pre-diluted coolant with an extra liquid the dealer give me to raise the boiling point of the coolant.

I have a performance box cdi:
https://www.ebay.com/itm/BLACKBOX-Pe...NYPG~p&vxp=mtr

I want to try another cdi but there is only 3 z's on my Island and their harness is different.

I don't know what to do.

Any kind of help is appreciated.

05' Ltz 400
BBK 434
New style hot cams
Ported head
FCR 39
K&N Air filter
Tusk nerf bars

Last edited by The Tru; 04-10-2018 at 07:37 PM.
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post #2 of 16 (permalink) Old 04-10-2018, 07:55 PM
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what happens when you loosen the gas cap ?

The White Beast
03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #3 of 16 (permalink) Old 04-10-2018, 10:22 PM Thread Starter
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Quote:
Originally Posted by cataway View Post
what happens when you loosen the gas cap ?
no change.
i have raptor petcock as well

05' Ltz 400
BBK 434
New style hot cams
Ported head
FCR 39
K&N Air filter
Tusk nerf bars
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post #4 of 16 (permalink) Old 04-11-2018, 09:20 PM
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In your pm, you mentioned it does the same thing with a stock carb and an FCR. I see you have a raptor petcok as well and have tried opening the gas cap. Other than a fuel line being linked or dirt in the gas tank, that pretty much rules out fuel delivery.
I would be sure no wires in the CDI harness are touching the exhaust or engine block. They can warm up and change their resistance enough to affect the CDI.
You can also check the resistance on the coil as per the manual. Check it when cold and immediately after it starts acting up when warm. You may find it is going out of range when it is hot. Other than that, a spare CDI is always good to have, right?

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #5 of 16 (permalink) Old 04-13-2018, 01:36 PM
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post #6 of 16 (permalink) Old 04-15-2018, 10:52 PM
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Huh?

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #7 of 16 (permalink) Old 05-04-2018, 10:00 PM Thread Starter
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Quote:
Originally Posted by jetmech25 View Post
In your pm, you mentioned it does the same thing with a stock carb and an FCR. I see you have a raptor petcok as well and have tried opening the gas cap. Other than a fuel line being linked or dirt in the gas tank, that pretty much rules out fuel delivery.
I would be sure no wires in the CDI harness are touching the exhaust or engine block. They can warm up and change their resistance enough to affect the CDI.
You can also check the resistance on the coil as per the manual. Check it when cold and immediately after it starts acting up when warm. You may find it is going out of range when it is hot. Other than that, a spare CDI is always good to have, right?
I bought a dynatek cdi and they told me I will need a A/C Kill switch.Does this mean I will now have to kill the engine using only the A/C kill switch or can I use the stock kill switch on the black blob to kill the engine?

05' Ltz 400
BBK 434
New style hot cams
Ported head
FCR 39
K&N Air filter
Tusk nerf bars
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post #8 of 16 (permalink) Old 05-05-2018, 08:58 PM
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Who told you that?

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post #9 of 16 (permalink) Old 05-06-2018, 01:19 AM
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I think he means NC kill switch? Normally closed?

2007 LTZ 400.. 94mm J&E piston, +4mm hotrods crank, 536webb cams,wiseco valves, 39mm fcr, tokyo mods throttle spring, honda thumb throttle,spring removed. yoshimura full exhaust, honda 400ex intake tube, no air box
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post #10 of 16 (permalink) Old 05-06-2018, 12:13 PM Thread Starter
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Quote:
Originally Posted by amcf18 View Post
I think he means NC kill switch? Normally closed?
Yes a N/C tether kill switch. Dynatek told me. They say I risk frying the cdi and having no warranty.

05' Ltz 400
BBK 434
New style hot cams
Ported head
FCR 39
K&N Air filter
Tusk nerf bars

Last edited by The Tru; 05-06-2018 at 12:18 PM.
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post #11 of 16 (permalink) Old 05-06-2018, 09:35 PM
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interesting........what do you run with your Dyna Alan?
I don't have a kill switch at all with mine.
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post #12 of 16 (permalink) Old 05-07-2018, 05:20 AM
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I canít see where that would make a difference. No kill switch works fine, just use the key.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #13 of 16 (permalink) Old 05-08-2018, 06:34 PM
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Quote:
interesting........what do you run with your Dyna Alan?
I don't have a kill switch at all with mine.
I just had the stock kill switch, so it must be normally closed as well.

2007 LTZ 400.. 94mm J&E piston, +4mm hotrods crank, 536webb cams,wiseco valves, 39mm fcr, tokyo mods throttle spring, honda thumb throttle,spring removed. yoshimura full exhaust, honda 400ex intake tube, no air box
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post #14 of 16 (permalink) Old 05-10-2018, 10:51 PM
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had one ....took it off

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03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #15 of 16 (permalink) Old 06-05-2018, 01:30 AM Thread Starter
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The current problem is solved. The problem was a faulty cdi
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05' Ltz 400
BBK 434
New style hot cams
Ported head
FCR 39
K&N Air filter
Tusk nerf bars
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