leaking radiator
 

hello the warning light on the display came on for overheated motor,so when the engine cooled down i checked the radiator no water so i filled it up again and rode home,when i came home my right foot was wet and water waz leaking from the filler cap.has anybody an idea what it can be .the bike is 08 xt660r with 50,000kms,help

Did you notice if the fan came on or not?

yes the fan came on.

the fan came on when the warning light came on,:100: but after i filled it with water it did not come on,the water that leaked was warm and not hot

I would check to make sure that all the clips are tight that hold the radiator hoses on, fill up and test it again. I had a leak in my raditor hose once and have still yet to find out why the water level keeps ever so slightly going down in the bottle over a few months riding.

If not and it is probably the cap, it could just be a worn rubber seal, a new radiator cap shouldnt be too expensive.

It was in my case. Go with inner tube for both seals.

thanks guys ill try to fix the cap with the innertube hope it works

Radiator cap info.

http://www.xt660.com/showpost.php?p=143923&postcount=4

I'd check the oil for any water contamination just to be on the safe side.

thanks for the info kev new cap on order 40 euro:thumbsup:

I bought a brand new Aprilia Pegaso Trail a few years ago.
As i had a trip planned already, I took a taxi to the shop, where they had mounted all the bags and stuff already, put all my gear on it and went to the trip. Through muddy / gravel roads of course. After 100km, overheat warning came on. After I shut down the engine, I noticed i've lost all my coolant. It all came out via overflow pipe or something (dont know how to call that pipe on radiator). Didn't have any coolant as i was in the middle of nowhere, we used drinking water (with bubbles) to get me out of there. Drove back trhough normal roads, with high gear and low revs, to keep the engine cool. Took the bike back to the shop the same day. My trip was ruined, i was tired and the salesman was surprised.

Next day they called me they ordered a new waterpump.
Then a week later they told me they replaced all coolant-related stuff.
2 weeks later no news. Called the shop and asked for money back. Got the money back (all of it), went to Yamaha centre, bought a new XT660 :P

Few months later i had to buy an oil filter to another aprilia so I had to visit the shop. Asked, what happened to the Pegaso. The salesman went a bit red - a week after i returned the bike, they accidentally changed (during some testing) the radiator filler cap from my bike to another. The fault then moved from one bike to another. So there it was ;)

I don't blame tha Aprilia centre, NOBODY ever thought that the simplest thing could go wrong on a brand new bike... That's why nobody ever tried to replace that.

well i got the cap it stopped leaking ,but it started leaking with the pump so ive changed all the seals in the pump and now its fine :smile[2]:

Please can you give me the date stamped on your leaking radiator cap, thanks.

I've just developed the exact same issue on my 07 XTX, the radiator cap was leaking but not massively. When I took the rad cap stoppers off, let the bike idle for about 2 minutes, then it gushed out. The coolant is flowing with no other leaks, as far as I can see that is. The overheating light hasn't come on yet and neither has the fan. I've checked the rubber seals and they look OK but then again I've really no idea!! My question is, did replacing the rad cap solve your issue?

I've posted this before but just in case anyone does have Rad issues. Try these guys first before you splash out on a new one. They do good work and to be honest good people like this are hard to find... I've used them to sort a rad leak on another bike. They pressure test and go from there and aluminium rads are not a problem.... hope this helps..

http://www.felthamradiators.co.uk/

The water will poor out if the cap is left off, the radiator cap is there apply pressure to the cooling system which raises the boiling point of the cooling system to around 110 degrees C. The XT660 fan only kicks in at 105C so if the cap is leaking the water will poor out & the fans won't run due to the pressure loss & the water will boil at 100 degrees C.

Yes my new radiator cap fixed my coolant leaking problem.