Question about Honda NSR 125 R Motorcycles

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1990 NSR 125 keeps overheating

My bike keeps over heating and I can't seem to think what it could be causing it, the water pump is working as the coolant is getting to the boiling point so it must be getting pumped round. any help would be appreciated

Posted by Anonymous on


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Hi, Anonymous and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant and needs bleeding.
7. Engine idling too long or bike moving too slow.
8. Coolant too old needs to be replaced.
9. Faulty temperature sensor, wiring or connector.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
My Girlfriends ****** NSR125 Overheating
honda nsr 125 rk overheating for the third time arrrrrgghh
NSR125 1988 01 HONDA SERVICE REPAIR MANUAL Download Manuals Technical $10

Posted on Aug 08, 2017


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Posted on Jan 02, 2017

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SOURCE: 1990 bmw 525i overheating ..

No such pump! Make sure you have anti-freeze in the radiator. It circulates better than just water, because water boils and turns to steam (goes UP) proper antifreeze helps it not have pockets of steam/air.

Posted on Dec 22, 2008

  • 1 Answer

SOURCE: overheating

It could be your head gasket.

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SOURCE: removing water pump impeller

you might have to split the case to get to the back side of the impeller.

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SOURCE: 1997 bmw z3 conv. 1.9 overheated, changed

hi jasso, I would recommend checking the water pump if you see no flow in the radiator. Make sure when you fill up the cooling system, that you fill it cold, and that the vent screw in the radiator is loose. fill system until fluid comes out the vent screw. tighten the screw, start the car and have someone run at 1500rpm and check for flow.also, make sure that you have your temp setting full hot and blower on middle speed so that you don't trap air in the heater core.

Posted on Apr 05, 2009

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SOURCE: What would cause the battery to heat up so hot that it would boil

It sounds like the voltage being applied to the battery is way too high. If a 12V system, it shouldn't exceed 14 volts, half that for 6 V systems. If you don't have a meter, buy one at Radio Shack or any auto parts store for < $20 US or if near a Harbor Freight Tool store <$10 US. Ask for a digital multimeter.

Posted on Apr 06, 2009

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Hi, Anonymous and the usual suspects are:
1. Engine oil level and SAE weight are too low or not circulating.
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For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
honda nsr 125 rk overheating for the third time arrrrrgghh
My Girlfriends ****** NSR125 Overheating

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Water shoots out of the radiator when car is running. Unable to add water/coolant because of this. What is causing this to happen?

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Hi i have a 1990 honda nsr 125 with the twin round headlight i beleve it is de restricted as it accelerate up to 11000 rpm 80 mph but once you get in to top gear 6 it slows down and i have trouble getting...

lol sorry to be the bearer of bad news but its still restricted most likely factory unless its second hand and restrictor kit was put in then would take a mechanic to get to the restrictor also stop driving the bike so hard is only a 2 and while do it damage if ya keep driving it so hard low gear driving will wreck your 2 stroke but best of luck in the future drive easy bud

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The phome in the air box keeps getin damp with oil

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1 Answer

Over heating

it could be several reasons

Is it water cooled
2srtoke or 4stroke

i couldnt tell you exactly what could be wrong but they are 2 main thing to check make sure you dont have a water leeek check your oil i think that can make it overheat but not tooooooo sure

May 08, 2010 | 2001 Honda NSR 125 R

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