VFR 750 making strange noise. What is wrong?

[dangerous]

My 1986 Honda VFR 750F RC-24 has started making a strange high pitched noise. What is wrong with it?
Here is a video of the noise
http://www.youtube.com/watch?v=hjUs7FVakJE

hey mate... thats one of my old bikes, when I sold it it was on about 140km whats it up to now?
Would you like me to come and have a look/listen?

[MSTRS:Me]

Just sounds like the cam gears to me.

[quickbuck]

Sounds okay to me.....
Noises can sound louder when you are listening for them.

[dangerous]

Sounds okay to me.....
Noises can sound louder when you are listening for them.

Yeah but as said it wasnt sounding like it is now before.
With the milage on this bike the gear drive cams will be getting worn, I have seen them noisie at the same milage that I expect this one to be at.

[quickbuck]

Yeah but as said it wasnt sounding like it is now before.

Or, it wasn't as apparent as before....

No matter, good on you for offering to have a listen.

I said on TM, it could be a lower viscosity oil.
I've done that myself.
Used the 15-50 one time, then the 10-40 the next....

Can make a difference.

[humvee]

I think I have sorted it now.

The key thing was I had always set the oil level on a cold cold engine but since last time oil change I had found a owners manual for that model bike and it said to run the bike then turn it off for a few minutes then check the oil level so I did.

I have now drained off about 400ml or a little more of oil so it is back at the level I have used for the last 4 or so years measured on a cold cold engine. after 2 mins idle the noise was 50% gone and after a 20km ride the noise is now 95% gone and Im not sure if the last 5% could be a small noise I havent noticed before.

Anyway thanks for the help hopefully all is well Im hoping to do the TT2000 this weekend so I dont need it breaking down on me.

[humvee]

hey mate... thats one of my old bikes, when I sold it it was on about 140km whats it up to now?
Would you like me to come and have a look/listen?

Hi, Thanks for the offer, I think I have it sorted now. It is now up to 160,000km, As long as all is well and I do both days of the TT2000 it will be up to 162k by next week :-)

[humvee]

Or, it wasn't as apparent as before....

No matter, good on you for offering to have a listen.

I said on TM, it could be a lower viscosity oil.
I've done that myself.
Used the 15-50 one time, then the 10-40 the next....

Can make a difference.

Same oil as last time Castrol 15w/50 I use the use 10w/40 but have used 15w/50 for last 2 changes.

[cheshirecat]

MIght pay to check the oil level cold and warm. I've found on mine, albiet a 94, that the level changes dramatically depending finishing a run or cold. On my last change including a new filter thought the level was perfect and now one month after discover it's a bit over. Guessing but may be too much therefore muffling low frequency noise. Doesn't seem an unhappy noise though. Good luck

[quickbuck]

Same oil as last time Castrol 15w/50 I use the use 10w/40 but have used 15w/50 for last 2 changes.

Sweet....

Glad it is all sorted for you.

Yes, Honda's measuring method seems a bit mickey mouse.
You need you have your engine actually working before you can put the correct amount of oil in..... Not always possible on some bikes.