Coolant FLOOD/pouring out??

[toshntv650]

Hi Guys hope you can share some advice.

Whilst i was carb-syncing the carbs on idle the engine got hot (3/4 on temp gauge) and the fan kicked in in for approx 1min. I notice coolant was pouring out from the over flow pipe under the engine. Since I bought the bike a month ago i never let it idle to check if the fan worked . I did to up the reservoir with distilled water as it was a bit low.

Does anyone have any idea why it started to pour out coolant from the overflow tube,

Many Thanks

Tosh

[Jake]

Just a theory but:

Maybe the coolant reservoir (or expansion
bottle) was already overfilled with old out
of date coolant, when you were balancing the carbs.....

Did you top up the coolant reservoir with a
50/50 ‘ethylene glycol-water mixture’, rather
than just water? The glycol-water mixture has
a lower boiling point than just water alone,
and won’t tend to expand (i.e. overflow) as much.....

www.hawkworks.net/manual/5.html

Another possiblity is that the mechanical seal on
the Water Pump is failing:

www.hawkworks.net/manual/5.html#5-7-water-pump

Also check that the cylinder head gasket is intact.