Suzuki ATV Forum banner

1 - 14 of 14 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter #1
Just got a mates old 2010 king quad 300, from what I've been told, he took it into the shop and they said the ECU is rooted, and it's not worth the time in labour to repair it. Apparently they said you can't just throw a new battery in it as it will ruin the battery. I've thrown one in it, runs fine, starts up every time without issue. So what's the go, the shop just trying to get him to buy a new quad, or is somethin actually bad in it?
 

·
Registered
Joined
·
1,688 Posts
KQ 300s don't have an ECU


Unless the new ones from other countries are fuel injected....which I doubt.....are you sure it's a 2010.
Where are you from?
 

·
Super Moderator
Joined
·
7,305 Posts
Yes, a CDI is absolutely plausible. And correct. And the last model King Quads (300) were discontinued in the U.S and Canada after 2004. Though as mentioned, they are still manufactured in Australia. Not sure if they are any longer. Post up the 17 digit Vin# and one of us should be able to tell you the what you have.

Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
5 Posts
Discussion Starter #6
I'll have a look at that vin # this arvo when I get home. Surely if it was a CDI it wouldn't run correctly? But maybe it is and all its doing is just screwing over the battery
 

·
Registered
Joined
·
174 Posts
Just looked it up 2010 king quad 300 has a mikuni bsr 29mm carburetor. No fuel injection.

Is it overcharging or undercharging?

If it's overcharging and burning out batteries it's probably the regulator/rectifier. It could have gone bad or be poorly grounded.

Undercharging could also be regulator/rectifier.
Bad generator.
Loose wire connections.
Shorted out wires.
To much draw on the battery from running to many accessories.
 

·
Registered
Joined
·
5 Posts
Discussion Starter #8
Yeah ok, my thinking was over the course of a few days, run it around a bit and monitor the voltage on the battery. Am I thinking along the right path or?
 

·
Super Moderator
Joined
·
7,305 Posts
Your rectifier might be causing the issue with your battery. The rectifier/regulator regulates your atv’s electrical system. When it goes bad if can cause two sorts of issues. An undercharging scenario which will drain your battery repeatedly until it can no longer hold and charge. Or a overcharging scenario where to much voltage creates havoc with your atv’s electrical system. Either one can cause issues with your battery, as well as performance issues as well. Checking to see if the rectifier/regulator is your problem is fairly easy. Using a volt meter or multimeter, start the bike and take a reading at the battery. At idle you should get a reading of about 13.0 - 13.3 volts. When revving the engine you get a reading of about 13.8 to 14.0 volts. If your readings are way lower or higher then the above mentioned then the issues lays with your rectifier/regulator.


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
5 Posts
Discussion Starter #10
so, I've done the little test, getting 12.55v at idle, revving does nothing to it. and i'm guessing that since there is no trouble, starting the quad itself that it wont be the cdi issue. are there any tests that i can run on the rectifier to see if she's rooted or not? and is there anything else that i should be checking that i might not have thought of, other than like a short/ broken wire somewhere, alternator etc.
 

·
Super Moderator
Joined
·
7,305 Posts
Yup, sounds like the rectifier is your culprit. Your reading of 12.55 volts at idle and when revving the engine indicates it’s not suppling a charge. That’s the reason your battery keeps dying. Your electrical system is relying solely on your battery to provide power to your entire system. And if your battery dies multiple times, it will eventually discharge and no longer hold a charge altogether.


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
2 Posts
Similar Charging Issue

My 2002 KQ 300 is not putting out any charging voltage. 12.5 at idle and at 4000rpm.
Could it be the generator? Replies seem to jump to rectifier. Is it rare to have a generator problem? What are some sources for new rectifiers?
 

·
Registered
Joined
·
1,688 Posts
The rectifier is most likely the problem....very common.

You can check ALL connections to the battery and all grounds....check the plug ( connector ) to the rectifier for corrosion or burnt contacts first to rule that out.

There are many places for an after market rectifier....Amazon--ebay etc....sometimes hit or miss on the quality....I have had decent luck with them but just be sure to be able to exchange or return if not up to par.

Generator ( stator ) problems do occur but usually not that common.
 

·
Registered
Joined
·
1,780 Posts
CDI is not connected to the battery at all. No common components. The stator has 2 separate windings, one for the CDI/ignition and one for the accessories.


12.55 volts is about right with the battery in place, however you should test it with the lights on and battery disconnected while running. It should get up to around 14 volts DC.
 
1 - 14 of 14 Posts
Top