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LTZ 400 current problems?

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8.7K views 15 replies 6 participants last post by  jetmech25  
#1 · (Edited)

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-P...-LTZ-400-Z400-05-08/140790807297?hash=item20c7c93b01:g:PNoAAOSw5cNYPG~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.
 
#2 ·
what happens when you loosen the gas cap ?
 
#4 ·
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?
 
#7 ·
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?
 
#6 ·
Huh?
 
#11 ·
interesting........what do you run with your Dyna Alan?
I don't have a kill switch at all with mine.
 
#12 ·
I can’t see where that would make a difference. No kill switch works fine, just use the key.
 
#13 ·
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.
 
#14 ·
had one ....took it off
 
#16 ·
Good to hear, thanks for posting the remedy!