Coolant expansion tank bubbling.
 

hi looking some advice
my sv650 race bike is filling the expanion tank with water and it is bubbling
the temp was reading 40 degrees then rising and falling to about 80this could not be right any ideas thanks.

Re: exp/ tank
 

so the temp on the clocks is 40c ? or in the tank ?

checked for bubbles in the rad (removed cap and tilted bike side to side ? rad full ?

what year bike k1-2 k3-9

Re: exp/ tank
 

clock is 40
no bubbles in rad
rad 200ml to top up after practice and race

Re: exp/ tank
 

i would expect the coolant to get warm in the expansion tank but not hot because that comes out of the cool side of the rad, fully warmed up temp on my k3 is 72c - 100c

when you say bubbling is that from heat or just the coolant been forced in to the tank ?

Re: Coolant expansion tank bubbling.
 

Radiator cap is not sealing correctly.

Re: Coolant expansion tank bubbling.
 

Sounds like yer bikes donald ducked, would you take bad money for it, or a trade with a "works" carby model ?