Overheating problem, any ideas?
Lloyd Reed
DE3won wrote in message <19981126201834...@ng124.aol.com>...
>Hello,
> I am new to this newsgroup, but I hope somone here can help me out. I am
>encountering an over heating problem that I cannot seem to solve. The bike
will
>heat up to the point of boiling over after only about ten minutes of
riding.
>Here is what I have done so far.
>
>Disassembled all cooling system parts, and flushed them.
>Had the radiators flushed
>Checked the jetting.......I jetted up to the point the thing would barely
run
>for being so fat, and it still got hot just as quick.
>
>What's weird to me is that it started it out of the blue one day. I had
made no
>changes to the bike at all. We rode all morning and it was fine, the about
noon
>it stated doing it. The tempature had not changed much at all. After I
flushed
>and checked everything I could think of, I went back out and still have the
>same problem. The bike does not run bad nor does it seem to have lost any
>compression. I checked for water in the oil and visa versa and don't find
any
>problem there. I pulled the head off and the piston and cylinder looked
fine,
>the head gasket was completely covered in anti freeze and there were a
couple
>of drops on the piston, but I think it was just a little that ran out of
the
>head when I pulled it off, although it might have been a blown head gasket.
Is
>that very common? Any other ideas will be appreciated, I am stumped now.
>
>
>Thanks,
>Mike Long
>95 CR-125 <~~~ over heats
>92 CR 250
>
Blown head gasket can cause it to puke it's anti-freeze. If it's not blown
bad (yet), it might not have any other symptoms. (yet)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
If it can't kill you, It ain't a sport!
Bandit1200
LT250R
Lloyd
DE3won
F4BikeNuts
>encountering an over heating problem that I cannot seem to solve.
Have you checked the water pump impeller?
-Chris Orndorff
F4Bik...@aol.com
JFisher304
Almost671
MX Tuner
>Hello,
> I am new to this newsgroup, but I hope somone here can help me out. I am
>encountering an over heating problem that I cannot seem to solve. The bike will
>heat up to the point of boiling over after only about ten minutes of riding.
Don't overlook something simple like the radiator cap not holding
pressure adequately. My RMX did the exact same thing. A new cap fixed
it. An automotive cooling system pressure tester can check this
accurately.
MX Tuner
DE3won
find any markings on it.
MX Tuner
>Good idea, I never thought of that. What pressure should it hold? I couldn't
>find any markings on it.
They vary but it should hold about 1 bar (15 psi). Check the shop
manual for specific info. You will have to "tee" into the bleed hose
between the two radiators (instead of buying a cap adapter).
MX Tuner
Simmonsmc
>manual for specific info. You will have to "tee" into the bleed hose
>between the two radiators (instead of buying a cap adapter).
>
>MX Tuner
>
>
>
>
>
>
I took the cap off an old bike I hade down to the dealer he had a tol to check
it,it was bad, he suggested i go buy a cap from a KTM they hold a few more
pounds than the honda ones, he (this is a honda dealer) tells me this is an old
trick a lot of CR500 riders use to stop the overheating.
Mike Simmons
99 KTM 300
MX Tuner
>I took the cap off an old bike I hade down to the dealer he had a tol to check
>it,it was bad, he suggested i go buy a cap from a KTM they hold a few more
>pounds than the honda ones, he (this is a honda dealer) tells me this is an old
>trick a lot of CR500 riders use to stop the overheating.
I heard the hot ticket was a KX cap for a CR 500. I think its rated
pressure is 1.5 bar vs 1.0 for the CR OEM.
Seems like the first place to start is determining if the original cap
is letting go prematurely.
MX Tuner
Adam
-Adam
DE3won wrote:
> Hello,
> I am new to this newsgroup, but I hope somone here can help me out. I am
> encountering an over heating problem that I cannot seem to solve. The bike will
> heat up to the point of boiling over after only about ten minutes of riding.
Simmonsmc
bucks, it worked so well I bought the rest of the bike!
99' KTM 300 mxc
Mike Simmons
JFisher304
quick. I have the motor torn down now, so we'll see what happens. Thanks for
the ideas so far, I'll get it one of these days.
hite...@best.com
> Thanks,
> Mike Long
> 95 CR-125 <~~~ over heats
> 92 CR 250
>
>
After reading all the posts, it sounds to me like your head gasket my have
been the problem. If the head gasket has a small leak (pin hole size is all
it takes), hot gases from the cylinder will heat your coolant in a hurry.
I've seen this happen on car engines and have heard about it happening on
motorcycle engines. Less likely possibility is a crack cylinder. Good luck
and let us know what fixed the problem.
Dan-o
CR500
http://www.best.com/~hitecdan
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JFisher304
see what happens.