Coolant refill for Super Four

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iansoady
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Bike owned: 1993 CB400 Super Four
Coolant refill for Super Four

Post by iansoady » Mon Feb 06, 2017 3:35 pm

I was convinced I'd already posted this.....

I'm refilling coolant on my 1993 SF. It's very slow to fill and seems to get airlocked all the time - air bubbles up through the coolant I've just put in (through the pressure cap housing, with the tank off).

Is this normal? Is there an air bleed screw somewhere I've missed? Or do I just need to be very patient?

Superjack44
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Bike owned: 1CB400 SF 1 VFR800 1 Moto Guzz
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Re: Coolant refill for Super Four

Post by Superjack44 » Mon Feb 06, 2017 5:54 pm

I usually lean my 92 superfour as far to the left as possible (a friend helps) when refilling mine so as the filler cap is as high as possible makes any trapped air easier to release.
There is no bleed screw, well not on mine.

JamesHambleton
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Re: Coolant refill for Super Four

Post by JamesHambleton » Mon Feb 06, 2017 10:04 pm

I rock mine from side to side when I do it and occasionally run the engine as it seems to shift some stuff round the system and helps to clear the air out of it.

iansoady
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Bike owned: 1993 CB400 Super Four
Re: Coolant refill for Super Four

Post by iansoady » Tue Feb 07, 2017 10:05 am

Thanks both.

Oddly, I actually found that getting it vertical seemed to help but still slow.

It's kept the level overnight so hopefully is full now.

It would have been nice if they'd arranged it so I could get at the cap without taking the tank off.


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