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.
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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

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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.

Posted on Mar 29, 2009

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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

  • 5568 Answers

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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