Hi all,

Have a 91 ZX600 that is acting up on me.
Tried to search the forums for answers, but got no results.

Bought it used about a year ago, cleaned out and lined the tank, had the carbs rebuilt, replaced the fuel filter, replaced the thermostat and started riding it. All in all it runs really well, starts right up and has plenty of power.

Now it has a cooling down/dying problem when running at highway speeds after about 30 minutes of ride time. Air temperature does not effect it. It can be hot or cold out and it still does it.

Riding down the road at highway speed (60-90 mph) bike is running great and then it starts to loose power, the temperature drops off and it dies out. Roll it off the side of the road, play with the throtle to keep it running for a few minutes, let it warm up and off you go again for a while.

Antifreeze is full and it is a new thermostat.

Could this be a coil issue?

Coils(s) getting hot and cutting out, which causes engine dying out, which in turn lets temperature go down. As engine cools, coils(s) cool and start working again, which allows engine to run correctly and heat back up. Repeat over and over.

Any thoughts would be appreciated.

Thanks,
Mike

 

It very well could be the coils. I would say coils, MAYBE plugs, or fuel pump. Your bike doesn't have a fuel pump. so I would test the coils and at least rule those out. Easy enough.

 

yes, rule something out so that you can get a baseline

 

Ready??
It's fuel (or lack of)
Check the vent line on the tank. When you lined the tank, you may have blocked the vent tube (gotta let air in when fuel comes out) and the tank is vacuum locking on ya. This slows the fuel flow to the carbs, and the the float bowls don't stay at the right levels. Also pull the petcock off and check the screen for dirt, old gas sludge, etc...