ok dudes there is a weird whistling from the top end when the bike is off am thinking head gasget but not sure becouse it was only done a few months ago?

Hi

head gasket gone on an engine is best diagnosed at tickover revs.

Some common effects:-

---Typically it makes a "Farting" noise in time with the compression part of the stroke.

---Normaly also acompanied with "eating" cooling fluid.

---Difficulty starting from cold because the cylinder fills a little with coolant during non use.

---Pressurising the cooling circuit when hot.

Just want to fully understand what you meant when you said "when the bike is OFF". Do you mean switched off (so when kicking it over?)

Dom

thanks for replay it isint eating the coolant when the bike is switched off not runing as if you where puting it away

Sounds like a leak from the coolant system from a location above the level of the water ie at the highest point - maybe the cap seal leaking steam or maybe the pressure relief device in the cap is leaking a bit of steam.

Try also loosening the fuel tank cap while the noise is happening to test if the noise is from there or not.

It's just happy after a day of riding.

Seriously though feetupfun's right, it could only be coolant or gas tank venting as the cylinder doesn't hold pressure for very long and then only if the piston is in just the right spot. I'm inclined to think gas tank as any hole big enough to whistle in the coolant system will usually cause a boilover.

Mine did that and I found I had a hair line cut in the radiator vent/overflow tube (coming off the cap). A little liquid tape and it hasn't whistled since.