Hello
I have an 08 CBR1000. I flushed out my old coolant in the following order:
- Drained out the coolant reservoir
- Opened drain bolt to drain from radiator

To fill up I added new coolant to the reservoir about halfway. Then I started to fill the radiator. Upon doing do I noticed the coolant isnt going in even though the radiator is empty. I rocked the bike side to side trying to remove air pockets. There are some tiny bubbles coming to the surface which then allows the new coolant to flow through. I have to repeat this process several times but very little coolant is flowing through after a lot of rocking the bike sideways. I have also squeezed the hoses on the left hand side of the bike and noticed a few bubbles from the radiator fill cap but its not enough for a normal flow.

When I loosen the drain bolt just a little and then start adding the new coolant it fills up normally. And as expected there is coolant draining from the other side. But as soon as I tighten the drain bolt the radiator fill cap does not want to take in coolant.

Any help would appreciated on how to resolve this.

Thank you.

 

how much new coolant ru able to get in there?
could try bleeding the air by running the bike up to temp.
but if almost no new coolant can go in, that sounds like there's something odd going on.

 

Thanks, that solved the issue. I did like what you mentioned and was able to bleed the air out while the bike was running with the radiator cap off. Thanks again