NSR Overheating, thermostat changed..

[Cwizard]

hey all,

Other week the NSR decided to hit the nice red line on the temp dial, great. Now changed the thermostat. Still overheating.

Thinking waterpump, anyone changed one before, how much work ami looking at?
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Honda NSR 125 R1 (51)
Back and better than ever!!

[ncrn]

You have checked there is in fact coolant in the system right? My bike lost mine due to a loose clip while I was riding and so I got a red temp line.

I can't see a price for the water pump but if you email the people at https://www.davidsilverspares.co.uk they should be able to tell you.

But yeh I'd check first that there is coolant in the bike and you haven't got a leaking pipe somewhere.

Oh and don't ride it if it's doing this, you may sieze the engine.
____________________
Past: 55 Sym Jet, 91 ZZR250, 03 NSR125R. Present: 97 ER-5.
https://www.nsr125.co.uk - NSR Owners forum.

[ncrn]

Another thought did you bleed the system after filling it with coolant? I'm assuming you were the last person to fill it with coolant here.
____________________
Past: 55 Sym Jet, 91 ZZR250, 03 NSR125R. Present: 97 ER-5.
https://www.nsr125.co.uk - NSR Owners forum.

[Cwizard]

yeh theres tons of coolant, only checked the other day, got a little test the local bike shop said, lift tank start cold with rad cap off to make sure water movement. it suddenly happened. didnt notice till got to my house. overheating with coolant dropping out of the overflow. checked all the hoses, none loose.
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Honda NSR 125 R1 (51)
Back and better than ever!!

[alains]

change head gasket !
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the worst day fishing is better than the best day working

[ncrn]

If you wanna inspect the water pump at all then you'll need to drain the coolant, also to change the head gasket you need to drain the coolant.

Have you got a copy of the manual? I recommend you take a look at it, do as alains recommends he knows the NSR inside out . I guess it wouldn't hurt to look at the pump while the coolant is out.
____________________
Past: 55 Sym Jet, 91 ZZR250, 03 NSR125R. Present: 97 ER-5.
https://www.nsr125.co.uk - NSR Owners forum.

[Cwizard]

what on earth for , the engine has only got 1000 miles on it, remember was a new engine alains

https://www.bikechatforums.com/viewtopic.php?t=126161&highlight=
____________________
Honda NSR 125 R1 (51)
Back and better than ever!!

[bugsy46]

[Cwizard]

[iooi]

Stupid question time......

Does that fan come on when it starts to overheat ??

Is the rad full of dead flies and other such crap, which will stop it working....


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Just because my bike was A DIVVY, does not mean i am......

[Cwizard]

fan? what fan?

i dont have one, bit of background, since the engine refit the bike has been running sweet as, its only a couple of weeks ago it suddenly overheated, by sudden i mean i had been riding about in the evening, put bike away, took it out next day. Halfway to friends house, red line and steam. now this was enough for me to call ahead and say im gonna be a while. let it fully cool down as i pushed the 2 min to his house, left to cool all day. rode back in the afternoon, 5 mins down the road the needle is tickling the red line. no steam, left to cool, spoke to father in law who suggested changing the stat. done and not much difference. thats where i am at the moment.
____________________
Honda NSR 125 R1 (51)
Back and better than ever!!

[iooi]

Should be a fan behind rad to draw cool air through when you are stopped.
____________________
Just because my bike was A DIVVY, does not mean i am......

[bugsy46]

Just because the needle moves doesnt mean to say the switch cant be faulty, BUT it could also OR be a fault with the clocks
____________________
Laura - "And where did looks come into this and bugsy leave steven alone. You are not gods gift to women you may think you are but you're not."
Keith - "All the best"

[Cwizard]

never had one, NSR's dont have them do they?
____________________
Honda NSR 125 R1 (51)
Back and better than ever!!

[bugsy46]

Shouldnt be anything to do with the fan, how often this time of year does your fan come on when riding? ie when does the temp reach fan territory? especially on a low powered machine
____________________
Laura - "And where did looks come into this and bugsy leave steven alone. You are not gods gift to women you may think you are but you're not."
Keith - "All the best"

[ncrn]

[Cwizard]

ok proper novice question, how can i test the switch, short of replacing it. though i dont want to get into the point of replacing everything till i find it
____________________
Honda NSR 125 R1 (51)
Back and better than ever!!

[Cwizard]

would it be suffering a leak problem with a newly built top end fitted and checked by honda?
____________________
Honda NSR 125 R1 (51)
Back and better than ever!!

[bugsy46]

Find the switch, there should be a wire going into it, put this wire to earth, or , remove the switch, put in water, heat the water, then using a multimater measure the resistance whilst referring to specs
____________________
Laura - "And where did looks come into this and bugsy leave steven alone. You are not gods gift to women you may think you are but you're not."
Keith - "All the best"

[bugsy46]

If it was pissing out coolant youd know it, there will be dried in white splash marks, and a nice sweet smell!!!
____________________
Laura - "And where did looks come into this and bugsy leave steven alone. You are not gods gift to women you may think you are but you're not."
Keith - "All the best"

[Cwizard]

well none of that. so thinking switch check then. i'll be glad when this poxy bike doesnt have any problems. pretty much replaced the entire bike.
____________________
Honda NSR 125 R1 (51)
Back and better than ever!!

[prawny1]

Do you live in a hard water area? If so it might be a furred up rad (limescale) try running some viniger or half a calgone tablet throu your system.

Might be worth popping the water pump cover of and checking that it is engaged with the gear properly and that it is secure on the shaft.
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hellkat wrote:

Some people are only alive cos its against the law to kill them.

[Tango675]

[ncrn]

I agree with Goat-Boy really, you should take the cooling system apart and have a good look at it, obviously after testing the switch as mentioned above.
____________________
Past: 55 Sym Jet, 91 ZZR250, 03 NSR125R. Present: 97 ER-5.
https://www.nsr125.co.uk - NSR Owners forum.

[Thom_NSR]

Could lack of two-stroke (broken pump?) cause this sort of rapid heating of the engine?