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.
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.
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.
If I go out for a 3 hour ride and come back and don't touch it for like an hour and start it back up its as if there were no problem with it at all. It will start right up with a full crank.
I have seen where a bad or going bad starter is affected by heat soak causing heavy draw on the battery. Just throwing it out there, there are alot of pros here with more knowledge than me. Good luck with repair.
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.
I will be changing the start or motor as I have heard that they can be severely effected by heat and age. Also I have replaced everything else in the charging system. So I don't know what else to do.
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.
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 ?
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.
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