Cooling Problem - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 16 (permalink) Old 06-25-2019, 02:46 PM Thread Starter
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Cooling Problem

Hi Everyone,

Just to eliminate other problems/solutions,I thought I'd start off with some things that are already checked off. My 09 FJR is topped off with coolant. At the same time, the water pump appears to be working just fine. All hoses and connections are securely tightened, so there are no leaks. I also burped it a time or two in order to get rid of any air bubbles in the system.

Every time I start the bike, the temperature gauge steadily climbs to where it's at the very top. This is especially the case when I put it into gear and go around the block a time or two. There's also been a couple of cases where the bike gets pretty hot at first, and then cools down and retains a good temperature throughout the rest of the ride.

This particular problem first started when I had to take cooling pipe out in order to access a wire and fix an electrical problem. Since then, I also had to buy a new pipe, because the old one seemed so bent, I couldn't fit it back into the cylinder head. The new pipe I received fit just fine with a new pair of O-rings. There's no leaking of antifreeze anywhere. Any ideas?
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post #2 of 16 (permalink) Old 06-25-2019, 02:56 PM
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is the fan kicking on around 6 or 7 bars?
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post #3 of 16 (permalink) Old 06-25-2019, 03:40 PM
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Still some air in the system ? Sticky thermostat ?
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post #4 of 16 (permalink) Old 06-25-2019, 04:53 PM
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I had the same problem with my 06 fjr, I'm not saying it could be your problem, but it's worth while checking it out. You have to remove the water pump, and look inside the engine, you will see a sprocket with a chain on it, use a screwdriver to see if the sprocket turns, if it doesn't turn it's all good, this is for the oil, water pump drive shaft, I had a snapped chain on my bike. I hope it's not your problem.
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post #5 of 16 (permalink) Old 06-25-2019, 05:03 PM
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Get a laser thermometer to verify that your coolant sensor is reporting accurate information. You can point it at the thermostat area.

Robin
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post #6 of 16 (permalink) Old 06-25-2019, 08:15 PM
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Topped off with coolant..... where? At the radiator cap or the overflow tank? (I realize the cap is not actually on the Rad).

You must ensure system is full at the rad cap... I usually tilt bike left and right to get the bubbles out.
After that, ensure overflow tank has coolant and if you still have issues, I'd check the thermostat.
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post #7 of 16 (permalink) Old 06-25-2019, 08:37 PM
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Chances are you still have too much air, which will not allow the system to suck in coolant from the reservoir bottle.. you've ridden it a couple of times I take it, and it means it is low (at the rad cap). Refill, ensure the overflow reservoir is topped up to max or slightly above. After another cooling cycle it should suck some in when the bike cools down.... maybe a tad more on the second cycle but should stabilize.
The high temp reading is because the coolant temperature sensor in the coolant pipe is not in contact with coolant, but most likely air.
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post #8 of 16 (permalink) Old 06-27-2019, 08:40 PM Thread Starter
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Yep, it sure is.
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post #9 of 16 (permalink) Old 06-27-2019, 08:45 PM Thread Starter
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Well, I swapped the heat sensors. It still reads pretty hot. The fans do kick on at around 6 bars or more.
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post #10 of 16 (permalink) Old 06-27-2019, 08:54 PM Thread Starter
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What's the average water temperature on an FJR?
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