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, 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.

__________________
Plough on

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

__________________
Click here to join the XT Supporter's scheme

Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

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