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Old 01-10-2011, 08:49 AM   #1
nosaec
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Help! 2003 750 having an issue with temp

I apologize in advance if this has been asked before but I did do a search and found nothing that could help me. I have an 03 GXSR 750. On Saturday, the temps were about 55 to 60 so I went for a ride. My bike temp got up to 225 by the time I reached my desitination. I went inside store came back out, and it wouldn't start. It has happened before so I just waited about 20 to 30 minutes and she cranked up and I was off rolling again. My mechanic seems to think I need to flush radiator and use Engine Ice. I can understand temps getting up to 225 in the summer when outside temp is 90 degrees plus but at 50 to 60 degrees does this seem normal? Can anyone give me some insight as what to do to resolve this issue or what my problem actually is? Do I have a radiator, water pump or some other issue? Please help...thanks.

By the way, the only mod it has is a Yoshi pipe, not full system. I have not installed a power commander or new air filter yet but will within the next couple of months.
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Old 01-10-2011, 08:58 AM   #2
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have you checked you fluid level in the overflow/reservoir tank lately?
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Old 01-10-2011, 08:59 AM   #3
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The thermostat does not even open till over 200. The temps you mention are not really high. I would expect the engine to hit those temps even at 50 deg. Your battery may have been weak.
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Old 01-10-2011, 09:06 AM   #4
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The fluid level in the reservoir is at midway point. The battery is not something I thought about since it starts after temp gets to about 175-180. I will have battery tested. Thanks for the info.
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Old 01-10-2011, 09:12 AM   #5
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are your fans kicking on and off? does the temp go up to 225 and come back down? what speeds were you traveling at when it hit 225?
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Old 01-10-2011, 09:19 AM   #6
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Witchdoctor, I was averaging 80 to 85 on a 13 mile stretch. The temps started to rise when I exited and had to wait at a light. When I started riding it would go down. When it got to 225 I was at another traffic light then I stopped at the store and shut it off. I cannot be positive fan came on. When this happened in the past, it was tested and it did come on.
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Old 01-10-2011, 09:24 AM   #7
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i wouldn't worry too much then. just verify your fans are coming on. if it were to hit 225 at highway speed I would get concerned. sitting at a light, there is no air movment unless the fans are on.
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Old 01-10-2011, 09:30 AM   #8
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What about the starting issue? Each time I have to wait 30 minutes before I can start it. Is this a normal occurrence for GSXR's? Or at least older ones. Mine is an 03. I guess I really need to have that battery checked out.
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Old 01-10-2011, 09:32 AM   #9
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battery
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Old 01-10-2011, 09:32 AM   #10
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Quote:
Originally Posted by nosaec View Post
What about the starting issue? Each time I have to wait 30 minutes before I can start it. Is this a normal occurrence for GSXR's? Or at least older ones. Mine is an 03. I guess I really need to have that battery checked out.
I had an '02 750. This is not normal. When you say "doesn't start" do you mean that it doesn't even crank, or just that it doesn't catch/light off?
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Old 01-10-2011, 09:33 AM   #11
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A weak battery could cause hard starts when hot. I would charge it and see if it clears up. Either way I would dump the coolant and refill with engine ice or wetter and distilled water. What side of town?
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Old 01-10-2011, 09:36 AM   #12
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It won't crank. Just a one time attempt to turn over and then nothing. It actually sounds like it could be the battery. Kind of like when you don't start your bike for weeks, it gives the weak attempt to start and then nothing. That is what I get.
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Old 01-10-2011, 09:37 AM   #13
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Oh yeah, I am going to have the coolant flushed. Going to go with Engine Ice and distilled water. By the way, is it true you need two bottles of the Engine Ice for a flush? I keep hearing conflicting stories.
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Old 01-10-2011, 09:41 AM   #14
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Oh by the way, I live in Stafford.
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Old 01-10-2011, 09:43 AM   #15
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No need to use it for the flush. Flush with water only. Drain and refill with one bottle and top with distilled. Burp hoses and wait for thermostat to open. Once it opens top it off.
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Old 01-10-2011, 09:52 AM   #16
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Thanks BlueWave, guy at Cycle Gear told me I need it two, one for radiator and one for the reservoir. I guess he was just trying to get more money from me.
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Old 01-10-2011, 10:06 AM   #17
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That thing is running 225* at 80mph? Something is not right. It should run between 168-180* on average at freeway speeds, especially at 60* ambient tempts. Now in traffic it will get up to 225* easily. The fan will likely kick on around 220-225*....shouldn't ever go over 228* or so at idle.

But at cruising speeds at 50mph or more, that thing should run well under 190*....especially when it's cool out.

I would flush the radiator/system with regular water. Then refil with distilled water and about a half gallon of Prestone antifreeze. Don't mess with the engine ice or water wetter....that will gum everything up and it's to get it all out.

But all that being said, there shouldn't be a starting issue with it even if it's running 225-230*. It should still start like normal so that is something else. Does it not even turn over? Or does it turn over and not light off?
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Old 01-10-2011, 10:09 AM   #18
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Engine Ice is . After a while it breaks down and leaves a soap like residue in your cooling system inhibiting it's ability to shed heat.
The '00-'03 GSXR's radiators were very prone to corroding from the inside out, a condition made worse by running water without any antifreeze. I would run a mixture of antifreeze, distilled water and Water Wetter.

You may have two issues; the first being it sounds like the bike is running very warm.
Your fan should come on at 217-218 degrees and you should start to see the temp come down or at least stabilize. 225 is starting to get a bit warm.
Several things to check are; does your radiator cap hold pressure? Is the fan coming on for sure and at what temp? What condition is your radiator in? What condition is your coolant in? Is the thermostat opening and at what temp? Do you have good flow through the cooling system; water pump, no hoses/pipes crushed collapsing.

Second is the starting issue; check your cables for being tight and if there's any corrosion, not just at the battery but the solenod and chassis ground too. Check your charging system output, load test your battery.

Hope this helps, if you have any questions feel free to call me at the shop.
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Last edited by Patrick; 01-10-2011 at 10:14 AM.
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Old 01-10-2011, 10:11 AM   #19
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ZXALAN,
No, when I am riding it does run under 190. When I am at a traffic light or sitting idle it creeps up to the 225 temp.

It doesn't even turn over. Not until the temp gets to about 175 or 180 then it cranks with no issue at all.
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Old 01-10-2011, 10:13 AM   #20
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Patrick,
I may just have to come and see you. Heard a lot of good things about your place. Kind of tired of going around and around with it. I cannot get true enjoyment out or riding because of this issue.
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