RX4 overheating

pyoungbl · 05-19-2023, 10:43 AM

Your bike should not be running so hot. My first thought is thermostat not opening correctly. If you do replace the thermostat it's good time to swap the fluid although the fluid is so new it should not be the issue. Can't hurt, though. Since the fan is coming on the only other variable is the water pump. Although you can pull the pump to check for obvious problems I'd call that a low probability of being the problem. If the pump were toast you'd see much higher temps. Overall, these bikes tend to be over cooled so your problem is one for concern.

**JerryHawk250** · 05-19-2023, 10:48 AM

You may have air trapped in the hoses.

mvander · 05-19-2023, 11:13 AM

Thanks for the replies.

Looks like the thermostat is 10$ from CSC. I’ll pop one of those in, new coolant, and try to get any air out of the system.

Any tricks to purging air, or just let it run at operating temp with the radiator cap off?

05-19-2023, 10:48 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,555	You may have air trapped in the hoses. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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05-19-2023, 10:43 AM	#1
pyoungbl Join Date: Feb 2016 Location: Portsmouth, Virginia, USA Posts: 632	Your bike should not be running so hot. My first thought is thermostat not opening correctly. If you do replace the thermostat it's good time to swap the fluid although the fluid is so new it should not be the issue. Can't hurt, though. Since the fan is coming on the only other variable is the water pump. Although you can pull the pump to check for obvious problems I'd call that a low probability of being the problem. If the pump were toast you'd see much higher temps. Overall, these bikes tend to be over cooled so your problem is one for concern.
	1

05-19-2023, 11:13 AM	#3
mvander Join Date: May 2023 Posts: 11	Thanks for the replies. Looks like the thermostat is 10$ from CSC. I’ll pop one of those in, new coolant, and try to get any air out of the system. Any tricks to purging air, or just let it run at operating temp with the radiator cap off?
	2