Maintenance & Technical > KX500 Original

radiator cap

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Charlie500:
What is the stock radiator cap pressure? I just ordered an after market one that is 30 lbs. Is that right?

flyingfitz:
I think most caps are around 16 psi or 1.1 bar.  I bought a 1.6 bar or around 23 psi. It works great. 

Fitz

bob larry:
I flipped through the manual but didnt see stock.  Would like to know too

 :mrgreen:

Danger4u2:
Part numbers for a 2004 KX500
Stock part # 49085- 1070  1.1 bar or 15.95415 psi
Optional part # 49085- 1073  1.6 bar or 23.20603 psi

1 bar = 14.5037738 pounds per square inch
1 bar is atmospheric pressure at sea level

maddoggy:
flyingfitz is right, 1.1 bar = 15.95 psi is the stock cap rating. the optional cap is rated at 1.6 bar = 23.20 psi. anyone that rides their k5 hard will want to run the 1.6 bar cap due to the potential to overheat. the higher pressure cap will keep the coolant where it belongs. if you are running the high psi cap and still overflowing coolant you may have a head leak issue or some other problem.

looks like danger snuck one in under me while i was typing :-D

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