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Need help badly.

1K views 20 replies 8 participants last post by  rv6john 
#1 ·
Hey guys. So I have a 2007 gsxr 600. I am having a problem where my bike struggles to start and will not start when it is hot (200deg farenheit +.) it is almost like the batter is dead but it isn't. It is a brand new week old battery.

I have also put in a brand new rectifier and stator as well and the battery is getting its 14.5 @5000 rpm as well and holds its charge great.

When the bike is getting a cold start or around 180 degrees or less it will start no problem. By anything higher and it is like the battery is dying.

Everytime I turn my bike off I have to wait at least 30 minutes before It will actually start when I crank it.
 
#2 ·
Welcome.

Are you saying the bike cranks slowly during a hot start?

If so, I would first start by making sure that the battery terminals are clean, bright and tight.

Your charging voltage of 14.5 v DC at 5k is right on target.

If the terminals are good. Put a voltmeter on the battery and check the voltage when you are cranking it hot. It should not go below 10.5volts.

Sometimes even new batteries are defective. Rule the simple things out first.

Also, post an intro, with pics of your bike, in the "new riders and members" section when you get a chance.
 
#4 ·
My terminals are nice and tight and bright.

And yes it cranks slow as if it has low voltage.

I can ride the bike for as long as I want from cold start or warm start. but when I shut her off after riding, it needs to cool down before the crank will actually start to speed back up and turn over,usually around 180 degrees faren.
 
#13 ·
My terminals are nice and tight and bright.


Have you checked the other end of the earth wire? Is it making a good clean solid ground connection?

Resistance increases with heat so I would be checking this and the connections on the starter too.


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#5 ·
There was no need for a duplicate thread. If youd like I can change the title of this one to the more helpful name you gave the dup thread.

Take the advice given in this thread and then go from there. It sounds like you have a problem with your charging system which is very effected by temperature much the same way many voltage systems and electronics are.

Get a voltage DURING crank and report back.
 
#12 ·
Yes, this is a good thought.

I'd do one more test and that would be to check the voltage drop between the positive terminal of the battery and the starter terminal when you crank the bike. I would expect less than a half a volt drop, but I've never checked this on my bike.
 
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#17 ·
Hello,

Most starter-motors are either working or not. Often it's the brushes that wear away, or the end bearings elongate ( become oval in shape ),& then cause a short-circuit with the armature.

The load test you speak of will vary depending on the motor, compression & temperature.

If your battery is a non-genuine item, or a Heavy-duty variant, I'd replace it first to an up-rated specification, before spending all that time & money needlessly on a starter-motor & charging system.

Remember that once your ignition is on, your headlamp draws approx. 15-amps, & your EFI system ( fuel pump ) 10-amps. Your starter-motor would also need around 180-amps too to turn your motor over....So the real load is on your battery sir, & if it's not at the least the genuine item, then chances are your battery is really what's letting you down.

Grab a heavy-duty battery & see what happens. I'm sure you'll be fine from here.

Cheers,

Rastus
 
#19 ·
I have exactly the same issue on my k7 600 and its driving me nuts. Ive signed up to this page to try find an answer. I have recently changed the reg rec, stator and battery and it still struggles when hot. I thought it may be a bad earth so ran a new one from the battery to the frame and still no joy. Did you ever got yours sorted ?
 
#20 ·
I see where Rastus is going with his line of thought.

How hot is the battery when the engine is hot? Do you have one of the batteries you pulled out when you put the new one in?

If so this is what I'd do. First make sure the spare battery is fully charged. Then ride the bike till it's nice and hot and showing signs of difficult turning over. Then hookup the spare (cold) battery and see if a) it starts fine, or b) still struggles.

If a then it's the battery. If b then it might be the windings or brushes in the starter motor that are failing.

Just throwing an idea out there...


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#21 ·
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