coolant leak

[mr dave]

ive just noticed a slight leak from what looks to be a small hose from the thermostat cant be 100 %sure, question is the bike has been sitting on a rear paddock stand for a few weeks while the subframe was away getting powder coated i was wandering if there was an overflow or something that could be leaking fluid due to the position of the bike, or am i clutching at straws and being unusually optimistic

[lloydie]

Run it up on temp and you should see where it's coming from .

[fabiostar]

your mechanical water pump seal is on its way out, iv just had the very same thing.

[mr dave]

drip is hanging on the end of what looks like a metal connection between the rear cylinder head and the small hose that connects to the thermostat housing , cant really see it too well and cant start the bike coz all the electrics are disconnected and the fuel tanks full to the brim so i aint taking it off . So its going to have to wait till spring so i can burn up some fuel

[fabiostar]

can you take a pic of the offender

[mr dave]

bikes got the back end back on started it up and the drip dried up, let it run till the fan came on a couple of times, checked the next day still no drip, so everything good for now

[tony.mon]

That little hose is often the source of leaks.
To access it you have to take off the tank, airbox lid, carbs and airbox.
Simple job.
Half an hour.

[redpig]

your mechanical water pump seal is on its way out, iv just had the very same thing.

Heyup Fabio,
Just noticed a leak of what looked to be muddy water just below the water pump casing, bent down to have a look and there is a little hole in the casing where I think the leak came from, can't tell cos it hasn't left a trail just dried up on the front of the casing. There is indication of a tiny bit of oil coming from the hole.
Don't know much about it but according to Haynes there should be a little hose there, mine has nothing of the sort just a little hole, I'm worried about it being a big job as money wise I'm struggling these days. Not riding her since I noticed it though.

[VTR3545]

had a similar thing, thought a hose was split from the expansion tank but no....anyway as an interim measure (well for this year lol) I added radweld advanced and no more leak
Would have had a proper look but couldnt work out how to remove the carbs

[Wicky]

There is indication of a tiny bit of oil coming from the hole..

Sounds like water pump seal has faliled so it comes out the small overflow hole (later models '01+ have a overflow spigot) to prevent leaking coolant getting into the oil sump. Clutch cover and waterpump off. New seal, fresh oil and coolant and new gaskets.