Overheating problems

sah27513 · January 30th, 2013, 07:39 PM

Alright, so I just finished fixing my 2007 ex250 and got it to running pretty well except that it overheats in stop and go traffic. What I have already done to the bike, is cleaned the carbs and the jets, readjusted the mixture screws, and did a valve adjustment. Unfortunately the chain popped off, but that is another issue, I am waiting for parts to come in to replace that and will be changing the gear ratio to 15/42. Anyways the question is, what do I do to prevent the bike from overheating? ad what is the purpose of the liquid coolant if it does not cool the bike? any input would help thanks

csmith12 · January 30th, 2013, 07:51 PM

Did you just simply fill it up with coolant. Possibly there is still air in the system somewhere. Gotta burp that stuff out sir or she can still overheat.

Motofool · January 30th, 2013, 07:51 PM

Take a look at this:

http://faq.ninja250.org/wiki/Cooling_system

Things that always help:
Fresh coolant
Proper type and level of oil
Recommended idle rpm's
Clean radiator fins

sah27513 · January 30th, 2013, 07:55 PM

when filling it up, do I put it into the overflow? or directly into the radiator?

choneofakind · January 30th, 2013, 07:59 PM

Here's some info on servicing the coolant system:
http://faq.ninja250.org/wiki/How_do_...ling_system%3F

sah27513 · January 30th, 2013, 08:02 PM

Thanks, I did not realize that the fan was not supposed to come on just below the red line, I got nervous because it got about a third of the way from the red line, good to know it is running just fine

csmith12 · January 30th, 2013, 09:04 PM

Quote:

Originally Posted by sah27513

when filling it up, do I put it into the overflow? or directly into the radiator?

Add to the radiator, fill 'er up, start 'er up, warm 'er up (cap off)... blip the throttle 3-5 times, top 'er off... good to go.

MistahT · January 31st, 2013, 06:16 AM

Quote:

Originally Posted by sah27513

Thanks, I did not realize that the fan was not supposed to come on just below the red line, I got nervous because it got about a third of the way from the red line, good to know it is running just fine

I had heard it might come on sooner or wait right until redline. My 250 had overheating problems when I got it. Fresh coolant didn't help. Stripped it down to paint it this winter. I've already changed the fan switch sensor or whatever it is on the left side (when on the bike) of the radiator, also have a new thermostat and the sensor on the housing coming in. Hoses look good.

I'm pretty much changing the entire cooling system except the rad. If after all this the fan still waits til redline to come on, I'll accept it.

Motofool · January 31st, 2013, 05:22 PM

Quote:

Originally Posted by MistahT

I had heard it might come on sooner or wait right until redline.........I'm pretty much changing the entire cooling system except the rad. If after all this the fan still waits til redline to come on, I'll accept it.

The gauge temperature is measured at the thermostat and it should not reach the red line.

If temp is high and the new sensor of the fan doesn't command the fan to start, then the problem may be the radiator.

Calcification of its walls cause difficulty to transfer heat and to flow coolant.

The fan's sensor reads the temperature downstream the radiator, which should be just a little lower than the temp upstream, but not so much that the fan doesn't feel the need to start up.

MistahT · February 1st, 2013, 06:06 AM

Quote:

Originally Posted by Motofool

The gauge temperature is measured at the thermostat and it should not reach the red line.

If temp is high and the new sensor of the fan doesn't command the fan to start, then the problem may be the radiator.

Calcification of its walls cause difficulty to transfer heat and to flow coolant.

The fan's sensor reads the temperature downstream the radiator, which should be just a little lower than the temp upstream, but not so much that the fan doesn't feel the need to start up.

Thanks for the info!! In a couple months it should be back on the road. If it's still an issue I'll look into a new rad. Thanks!

FvnnyL3tt3r1ng · February 3rd, 2013, 11:25 AM

How far exactly does your needle go before the fan kicks on? I just want to clarify that your bike does hit the redline? I thought my ninja was overheating when I first got it but it just moves close to the upper end of the gauge while the fan keeps it from overheating. Never had it actually hit the right line even sitting there in FL stop n go traffic in the summer.

MistahT · February 3rd, 2013, 11:27 AM

My gauge gets about one needle thickness before red before the fan kicks on

FvnnyL3tt3r1ng · February 3rd, 2013, 01:15 PM

Quote:

Originally Posted by MistahT

My gauge gets about one needle thickness before red before the fan kicks on

Seems close. I think mine is about 2/3 the way there...

rickthefix · February 5th, 2013, 07:02 PM

your thermostat could be sticking partially closed or your water pump might could be not pumping enough fluid

January 30th, 2013, 07:39 PM	#1
sah27513 ninjette.org member Name: Steve Location: Tysons Corner Join Date: Dec 2012 Motorcycle(s): 2007 Ninja 250 Posts: 14	Overheating problems Alright, so I just finished fixing my 2007 ex250 and got it to running pretty well except that it overheats in stop and go traffic. What I have already done to the bike, is cleaned the carbs and the jets, readjusted the mixture screws, and did a valve adjustment. Unfortunately the chain popped off, but that is another issue, I am waiting for parts to come in to replace that and will be changing the gear ratio to 15/42. Anyways the question is, what do I do to prevent the bike from overheating? ad what is the purpose of the liquid coolant if it does not cool the bike? any input would help thanks

January 30th, 2013, 07:51 PM	#2
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Did you just simply fill it up with coolant. Possibly there is still air in the system somewhere. Gotta burp that stuff out sir or she can still overheat. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

January 30th, 2013, 07:51 PM	#3
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	Take a look at this: http://faq.ninja250.org/wiki/Cooling_system Things that always help: Fresh coolant Proper type and level of oil Recommended idle rpm's Clean radiator fins __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
	1 out of 1 members found this post helpful.

February 3rd, 2013, 11:27 AM	#12
MistahT ninjette.org member Name: Matthew Location: Maryland Join Date: Jan 2013 Motorcycle(s): 2012 FZ6R, 2006 Ninja 250, 1977 Suzuki GS550 Posts: 186	My gauge gets about one needle thickness before red before the fan kicks on __________________________________________________ 2012 Yamaha FZ6R (mine) 2004 Kawasaki Ninja 250 (wife) 2003 Kawasaki Ninja 250 Street Fighter project

February 5th, 2013, 07:02 PM	#14
rickthefix Crashing sux Name: Rick Location: N. Ga Join Date: Sep 2012 Motorcycle(s): 07 EX250, 04 ZX6R, 96 Vulcan EN500, 79 XS650-SF, 80 TS185 Posts: 62	your thermostat could be sticking partially closed or your water pump might could be not pumping enough fluid
	1 out of 1 members found this post helpful.

January 30th, 2013, 07:55 PM	#4
sah27513 ninjette.org member Name: Steve Location: Tysons Corner Join Date: Dec 2012 Motorcycle(s): 2007 Ninja 250 Posts: 14	when filling it up, do I put it into the overflow? or directly into the radiator?

January 30th, 2013, 07:59 PM	#5
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	Here's some info on servicing the coolant system: http://faq.ninja250.org/wiki/How_do_...ling_system%3F

January 30th, 2013, 08:02 PM	#6
sah27513 ninjette.org member Name: Steve Location: Tysons Corner Join Date: Dec 2012 Motorcycle(s): 2007 Ninja 250 Posts: 14	Thanks, I did not realize that the fan was not supposed to come on just below the red line, I got nervous because it got about a third of the way from the red line, good to know it is running just fine

February 3rd, 2013, 11:25 AM	#11
FvnnyL3tt3r1ng ninjette.org certified postwhore Name: Justin Location: Florida Join Date: Aug 2012 Motorcycle(s): Ninja 250 2001 Posts: A lot.	How far exactly does your needle go before the fan kicks on? I just want to clarify that your bike does hit the redline? I thought my ninja was overheating when I first got it but it just moves close to the upper end of the gauge while the fan keeps it from overheating. Never had it actually hit the right line even sitting there in FL stop n go traffic in the summer.

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