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david451 |
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david451 Borekit Bruiser
Joined: 06 Nov 2016 Karma :
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Posted: 14:28 - 01 May 2022 Post subject: NSR 125 R Cooling system problem |
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Hi guys, i will try to explain the problem the best i can:
The bike was getting hot over time. Taking a look into cooling overflow tank i noticed that it was getting filled over the max level like if the bike were pushing it out there.
My first tough was thermostat not correctly opening, so i took it out. Result? the problem still there.
Then i tough that the radiator could be blocked?¿ so i bough an used one. No luck.
Finally, after months thinking what the problem could be i saw air with some coolant trying to get out by the thermostat joint.
I tough that maybe i didnt squeeze the "screw" (sorry dont know the exact word im not english) tigh enough. But no, it was correctly set up.
So it looks like some extra pressure was getting into the system. That would explain why the coolant was getting pushed to overflow tank.
So my question is: im not a mechanical expert, does my theory above makes any sense? and, if so, it would mean that some gasket are actually bad and are filling air into the system, pushing the coolant to the overflow tank?
and, if so, which gasket could be? the cylinder or could it be the one by the water pump? if it would be the cylinder one, shouldnt coolant be getting into the cylinder aswell as air is getting out?
thx for your time! |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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MCN |
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MCN Super Spammer
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david451 |
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david451 Borekit Bruiser
Joined: 06 Nov 2016 Karma :
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Posted: 21:29 - 01 May 2022 Post subject: |
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Forgot to mention that.. about 2 years ago i replaced the piston for a bigger one.
Before replacing the piston a cylinder width measure is supposed to be done.
Since the cylinder had on its back about 50.000 km by then, i decided (by shopper advice, all be said) to buy the biggest one, without any measurement...
This leads me to another posibility, may a bigger and incorrect piston size be causing that extra unbearable pressure?
Anyway, i ordered a gasket set for the cylinder. I will check all the posibilties you told me and if everything is ok and the problem persist, an incorrect piston is the last explanation i can imagine of.
Thx for the replies. |
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steve the grease |
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steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
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david451 |
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david451 Borekit Bruiser
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jeffyjeff |
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jeffyjeff World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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MCN |
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MCN Super Spammer
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david451 |
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david451 Borekit Bruiser
Joined: 06 Nov 2016 Karma :
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Posted: 16:47 - 06 May 2022 Post subject: |
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Hey guys, so i have got my hands dirty today and something is bugging me about the gasket. Look at the picture please:
The cylinder has a big hole bottom where its supposed to pass coolant? and the gasket is closed just in that place? does that make any sense? my model is NSR R 1997 and the gasket set is this one:
https://www.amazon.es/dp/B00IRWL20K/ref=cm_sw_r_apan_i_KT524CNTFJ41ETN9MS1W?_encoding=UTF8&psc=1
Which is tagged as valid Honda NSR 125 F / R 1986-2001.
The old gasket was wet with the exact form of the cylinder hole like if coolant were trying to go trough there. |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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david451 |
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david451 Borekit Bruiser
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Posted: 17:46 - 06 May 2022 Post subject: |
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Mmm so that means the gasket is correct for the cylinder?
I still dont understand why there is a hole there when coolant is not supposed to go trough there?
Shoudnt it be easier to just had that hole closed? i mean, in the engine, there is also a hole in that place. |
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 18:53 - 06 May 2022 Post subject: |
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Pretty sure that void just goes nowhere so there's no benefit to having coolant pass through the gasket.
Your first port of call should have been to test the pressure cap as Jeffyjeff suggested. Now that you have the top off though make sure that you clean the gasket off the top of the cases where that base gasket goes. Stuff rags into the casing to make sure none goes into the crank case and don't use emery or whatever you've cleaned the barrel bottom face up with. Definitely don't use it on the head gasket faces. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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david451 |
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david451 Borekit Bruiser
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 19:44 - 06 May 2022 Post subject: |
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I could get that bolt out for you where are you? ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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david451 |
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david451 Borekit Bruiser
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Posted: 19:54 - 06 May 2022 Post subject: |
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ahah wish you were here man, but i guess we are a FEW milles away.
Im here -> https://goo.gl/maps/oktG5KhYvNjPFiDw6 Spain.
If you anywhere near here ill gladly take your offer.
Many thx anyway! |
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david451 |
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david451 Borekit Bruiser
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to v or not to v |
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to v or not to v World Chat Champion
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david451 |
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david451 Borekit Bruiser
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bikenut |
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bikenut World Chat Champion
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david451 Borekit Bruiser
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bikenut |
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bikenut World Chat Champion
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bikenut |
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bikenut World Chat Champion
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david451 |
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david451 Borekit Bruiser
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bikenut |
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bikenut World Chat Champion
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Old Thread Alert!
The last post was made 1 year, 353 days ago. Instead of replying here, would creating a new thread be more useful? |
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