• Has your topic been discussed? Check this quick video for search tips. You answer/info might already be waiting!

CBR650R cbr650r - runs too hot and the garage doesn't know why.

kolargol

2019
CBR650R ABS
Sep 14, 2020
2020
Hello

So I am a new biker ( got my licence at the end of August ) and i bought a second hand 2019 cbr650r with less than 4000km 2 weeks later at the begining of September.

I used it for 4 days, then I go to the garage for a service and because the bike got too hot on my way to work ( red light and everything....I had to stop for 20 minutes, then again on my way home )

Since then the garage has the bike, ie. 1 full month, and they confirmed me someting is wrong with the cooling system but they don't know what !

They changed the thermostat, then the radiator and now they are waiting a new water pump end of next week to replace it, even if they are not sure it will fixed the problem.

The bike still has its warranty so I am not really worried but I am REALLY frustrated as I only used the bike for 4 days and it will spent almost a month and half ( 40 days ) and the garage doesn't have a clue about what's wrong.

Any idea what it could be and what I should do ?

( PS : I live in France )
 

Itchytoe

2018
CB650F
Dec 15, 2019
So you will have a new radiator, new thermostat, and new water pump? The only things left in the cooling system will be hoses, the engine block, and a sensor that reads coolant temp. The most likely source of failure of those three items is the sensor.

How do you know the bike is overheating? Is it just the warning light coming on? If so, maybe the bike isn't overheating at all. It could be a bad sensor that is reading too high making you think it is overheating. Ask if the garage can get some temperature readings on the radiator and engine block with one of those infrared temp guns. If the block and radiator are about 200 degrees, you aren't overheating. It might simply be a bad sensor.

You could try to take it to a different garage. Sometimes a new person trying to figure things out works.
 

kolargol

2019
CBR650R ABS
Sep 14, 2020
2020
So you will have a new radiator, new thermostat, and new water pump?
Yep exactly !

How do you know the bike is overheating? Is it just the warning light coming on?
The bike was really hot ( I am a rookie so I do not have a lot of experience yet, but the bike was REALLY hot ), the garage took it for a spin and they confirmed something was wrong as, I quote, "half the motor is cooled down but not the other half !"

Ask if the garage can get some temperature readings on the radiator and engine block with one of those infrared temp guns.
This is exactly what they did ;)

It might simply be a bad sensor.
Now that you're talking about it...when they changed the thermostat they told me that they changed it even if it was working fine when they did test it outside the bike : the problem was that once mounted back, sometime it worked, sometime it did not. So it looks like it could be the sensor...
Is it that complicated to change the sensor(s) ?
If not then it seems crazy to me to change a radiator, a water pump...without checking the sensors !

You could try to take it to a different garage. Sometimes a new person trying to figure things out works.
I thought about it but I have to ride like 100klm and I don't want Honda to take this as an excuse to nullify the warranty.

Thanks A LOT for help ;)
( and sorry for my English )
 

Itchytoe

2018
CB650F
Dec 15, 2019
Ah, if it physically feels hot, the warning light is on, and the garage confirmed it with a temp gun, it's definitely overheating. No doubt about it.

The sensor isn't that hard to replace, so it wouldn't surprise me if they replaced it if they thought it might be faulty.

If half the engine is cool, but the other half is not, I would start to think that the passages through the block are plugged. That would cause weird flow through the block and overheating. There could have been some debris in a hose when the bike was first put together. Maybe a piece of a gasket on the floor that somehow found its way into a hose. I don't know how to check for that kind of problem, or how to get debris out, but it's a possibility. Other than that, I don't know. Definitely keep us updated when you figure out what the real issue is.
 

Road Hog

2014
CBR650F ABS
May 4, 2017
Thailand
I agree with Itchytoe, as I been riding my bike from new since 2014 in very hot weather and never had a overheating problem. So yes check the sensor out as they can go at anytime. I do change my water more often than what the book says because of the heat and use only Honda radiator water.
 

miweber929

2014
CBR650F
650F Alumnus
Staff
Feb 13, 2015
Woodbury, MN
This should be a fairly easy fix and fairly easy troubleshoot so the fact that’s it’s been a month and they still don’t have a repair makes me question them. I’m surprised they went the route of swapping the radiator without swapping the sensor, that would have been one of my earliest replacements and super easy to do.

Cooling systems are fairly simple. For mechanical parts you have the water pump, thermostat and temperature sensor. Then you have the radiator which is your heat “exchanger” device, coolant passages throughout the engine, the expansion tank and of course the hoses connecting it all. Within those items something isn’t working, they just need to find what. Sounds like they are working on it but wow, a month is a long time.

Good luck!!!!
 

kolargol

2019
CBR650R ABS
Sep 14, 2020
2020
Thanks you all for your messages !

I'll call the garage this week to know if they changed the sensors.

I'll keep you updated ;)
 

kolargol

2019
CBR650R ABS
Sep 14, 2020
2020
So, I call the garage myself around 2PM : they confirmed me they did received the Honda order today around 12h00.

No news from them during the afternoon so I just called them after 5PM ( ie. more than 5 hours after receiving the Honda order ) : the water pump is not in it.

They should received it Friday 23th...or not !

I am just stunned by how I am treated as a customer, this is amazing.
 

Road Hog

2014
CBR650F ABS
May 4, 2017
Thailand
That's Honda! When I was changing my spark plugs and didn't have the right tool for changing them. I rang up Honda to see if I could buy one.

They said bring your bike in and we will change them. Well I told them I had my bike all striped down and that I lived more than 150klm from them. Than

they hung up on me, so I had to do some crazy mods. to get the tool that I had to work. Honda in Thailand really only want to sell bikes.
 
Top Bottom