98 cbr heats up when at stop for long (Full Version)

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98 cbr heats up when at stop for long

  

CuBa871 -> 98 cbr heats up when at stop for long (6/8/2008 3:34:47 PM)

how yall doing. i have a 98 cbr and the problem is when im at a stop for long  period of time the bike starts to heat up fast but when riding for a bit it cools down but does the same thing when i stop again. Any suggestion on what i need to do for this problem? Thankz

  
Blue Fox -> RE: 98 cbr heats up when at stop for long (6/8/2008 4:08:05 PM)

Heat''s up to what temperature? All bikes (even my 07 600RR) will go from a normal riding temperature of 170 to near 220+ when I stop at a stop light. It''s normal, no problem there.

marc0011 -> RE: 98 cbr heats up when at stop for long (6/9/2008 5:36:30 AM)

My F3 has got this exact same problem.  My bike will go from just above C to just below H with the fan running within a minute or two.  Hec, my fan would kick in at stoplights when the outside air temp was 29 degrees.  It doesn''t overheat, but my battery goes dead after 15 or so minutes when I''m driving around town at low speeds (10 - 15 MPH) and the fan is on.  I have changed the thermostat and coolant and I still have the problem.  My next step was to change the waterpump but I just haven''t had the cash.  I have also read that overheating issues can be caused from a clutch that has excessive slipping.

HondaTech68 -> RE: 98 cbr heats up when at stop for long (6/21/2008 3:47:19 PM)

quote:

ORIGINAL: marc0011

My F3 has got this exact same problem.  My bike will go from just above C to just below H with the fan running within a minute or two.  Hec, my fan would kick in at stoplights when the outside air temp was 29 degrees.  It doesn''''t overheat, but my battery goes dead after 15 or so minutes when I''''m driving around town at low speeds (10 - 15 MPH) and the fan is on.  I have changed the thermostat and coolant and I still have the problem.  My next step was to change the waterpump but I just haven''''t had the cash.  I have also read that overheating issues can be caused from a clutch that has excessive slipping.

sounds like you have a charging problem to boot too

kevin_stevens -> RE: 98 cbr heats up when at stop for long (6/22/2008 4:25:58 PM)

It''s not a problem. Well, it may be a problem, but it''s normal operation. Bikes, especially SS bikes, don''t come with enormous heat sink radiators. For pete''s sake, they only hold a quart or so of coolant in the whole system! They heat up fast when they''re at a stop or below 40mph for extended periods because they just don''t get enough airflow to discharge the heat. Replacing water pumps, thermostats, and coolant that is working correctly in the first place won''t change that. The only real way to affect it would be to get some bigger/more powerful fans.

You can run Water Wetter or one of the equivalents if you like. It won''t stop the bike from heating up in traffic, but it will make it cool down a lot faster once you get some air moving through the radiator. It''ll run a bit cooler during normal operation, too.

KeS

marc0011 -> RE: 98 cbr heats up when at stop for long (6/23/2008 9:22:09 AM)

Yes the bike should heat up if sitting in traffic, but it shouldn''''t happen so quickly.  I understand that these bikes really are ment to have air flowing across them.  It is just that when I can start the bike up and it will go from C to having the fan running in 30 or less degrees (F) after only have been running for maybe five minutes, its a sign a of problem.  When the weather is warm (55 + degress F), I can''''t stop for even 20 second light or the bike will be in the verge of overheating.  Up until couple years ago, I could be at low speeds/stop go traffic for at least 25 minutes before the fan would kick in and the temp guage would climb slowly. Now the temp guage just but now it just shoots up... these seem to be familar symptoms of a problem.

kevin_stevens -> RE: 98 cbr heats up when at stop for long (6/23/2008 9:31:30 AM)

quote:

ORIGINAL: marc0011

Yes the bike should heat up if sitting in traffic, but it shouldn''''t happen so quickly.  I understand that these bikes really are ment to have air flowing across them.  It is just that when I can start the bike up and it will go from C to having the fan running in 30 or less degrees (F) after only have been running for maybe five minutes, it''''s a sign a of problem.  When the weather is warm (55 + degress F), I can''''t stop for even 20 second light or the bike will be in the verge of overheating.  This is a sign of a problem.


Ok, so you *don''t* have the same problem as the OP, who specifically said it was long periods of idling that caused the temp to go up.

What have you done so far to diagnose/treat?  I''d look at thermostat first and then water pump.

KeS

marc0011 -> RE: 98 cbr heats up when at stop for long (6/23/2008 10:16:29 AM)

True, I don''t have the exact problem as OP but it started out that way.  I just changed out the thermostat thinking "That''''ll take care of it."  Of course it didn''''t and decided to look into things before just buying parts.  I pulled out the water pump and can barely turn the thing by hand.  In addition, before I pulled the pump out, it began to leak from the weep hole.  I still have to do a pressure test on cooling to just make sure I CYA.  I''''ll do that once I get everything back together.
I did read something interesting, if a clutch is excessively slipping that it can cause overheating issues.  My clutch had been slipping before I parked the bike.  I pulled the plates out and measured them.  They failed to meet the minimum per the Honda manual.

kevin_stevens -> RE: 98 cbr heats up when at stop for long (6/23/2008 2:35:05 PM)

True but if the clutch is slipping you''ll usually see/smell it in the oil before the coolant temp goes up.  Really darkens the oil and it''ll kind of smell, er, clutch-y.  :)

KeS

Blue Fox -> RE: 98 cbr heats up when at stop for long (6/23/2008 11:51:44 PM)


quote:

ORIGINAL: marc0011

but my battery goes dead after 15 or so minutes when I''''m driving around town at low speeds (10 - 15 MPH) and the fan is on.



I believe that''s due to the charging system not kicking in until the bike is over 2500 RPM (at least that''s what it is on the 600RR''s and most other sportbikes).

marc0011 -> RE: 98 cbr heats up when at stop for long (6/24/2008 5:54:45 AM)

I agree fox.  My F3 kicks in about the same RPM and even then it''s just barely above battery voltage.  But the battery should hold better than that when under a load (15 min or so).  With that thought in mind, I had the battery tested and it came back with an F.  The other issue is the bike heating up so quickly.  I have pulled the waterpump out because of the leak at the weep hole and also found I could barely turn it by hand.  I decided to replace the waterpump since I can get it for $110, so I''ll say something if it improves or  if there is no difference.

dusterdude -> RE: 98 cbr heats up when at stop for long (6/26/2008 11:50:59 AM)

does anyone know the thread pitch on the cooling fan switch.i want to find one that turns on at a lower temp.

marc0011 -> RE: 98 cbr heats up when at stop for long (6/27/2008 8:50:55 AM)

You should be able to pull out the switch and then hold it up to one of those little gizmoes that measure the thread pitch for ya.  I do know this much... it will be metric.

dusterdude -> RE: 98 cbr heats up when at stop for long (6/27/2008 9:02:37 AM)

im with ya there,i just didnt want to have to drain the radiator to do that.

redzintimidator -> RE: 98 cbr heats up when at stop for long (6/27/2008 9:11:09 AM)

marc- my guess is your charging system is putting extra stress on the engine causing it to heat up abnormally. Run the stator/RR/battery check

  

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