slight tapping

[tattoo]

On my way to the office this morning i noticed a faint tap tap tap from the engine,it only sounded under acceleration,as soon as i shut off it disappeared and it doesn't sound while ticking over..

First thing i checked was the cct's but all the paint lines i put on them are still aligned so i thourght i might be an exhaust joint blowning but on inspection they are all ok,i checked with my hand for any signs of air leaks....only thing i can think of is it needs shims rechecking...the exhaust shims were alittle tight when i rebuilt it after the cct failure but not out of spec..

Any ideas

[Veturinkuljettaja]

If the valve clearances become too tight I believe it should make the engine quieter, not noisier. The manual CCT may need adjustment from time to time. Also, I've noticed, if the weather is very cold, it may take quite a long time for the engine to warm up enough so cam chain stops rattling completely. "Tap tap tap" doesn't sound like cam chain though... So could be something else.

[tattoo]

i'll have to listen to it again on my way home...the bikes running good,picks up nicely and revs right round the rev counter so it can't be anything that's going to cause damage....i know these bikes have all sorts of knocks, bangs and taps but this is a new one and it's annoying that it just does it when i accelerate and no other time.

[bigtwinthing]

i'll have to listen to it again on my way home...the bikes running good,picks up nicely and revs right round the rev counter so it can't be anything that's going to cause damage....i know these bikes have all sorts of knocks, bangs and taps but this is a new one and it's annoying that it just does it when i accelerate and no other time.

air leaks can cause that too, check all the hoses and clamps etc.

[lloydie]

Check the chain and sprockets too !

[darkember]

Carb slides worn

[tattoo]

Well on the ride home i had another listen to the new sound comng from the bike and it sounds more like a loud tick,it has to be loud to be heard over the cans tbh but again it only sounds when i accelerate,it stops when i ease the throttle back or shut off,i even stopped and knelt down at the side of it and listened to see if it did it on tickover but it doesn't...i have tomorro off so looks like taking the fairing off and checking the cam chain tension,all the hose clips and the exhaust for leeks

[Hairy biker]

Check for an exhaust blow from the head to down pipe joint, this can give a noise like your describing.

[lloydie]

It is strange that it only happens under load em when on the throttle .
If it was exhaust wouldn't it happen all the time ?

[Hairy biker]

Not unless it was quite a substantial blow,a slight blow from somewhere near the front of the exhaust(head to down pipe gasket or cracked manifold/down pipe) would give that characteristic loud ticking noise when the engine is under load,it's sometimes hard to find if it only does it under load,the easiest way I've found to check for leaks is by looking for soot marks or dark coloured dust stains around the exhaust area.

[tony.mon]

It is strange that it only happens under load em when on the throttle .
If it was exhaust wouldn't it happen all the time ?

Not if it's a crack at the rear of the system where the pipes separate after joining together.
That is held together by the rest of the pipes under normal conditions, but under higher pressures (wot) it can be forced apart.

[lloydie]

Ooh ok

[tattoo]

I've not had chance to check anything today due to the mrs wanting to go upto yorkshire to see my mum n dad and i'll not have chance to look at it until thursday as i'll be in paris...i will check everything thats been mentioned in this thread though

Thanks for the ideas as to what i could be lads

[Saintsman27]

what fuel grade and make r u using ? normal unleaded I hope
high octane makes my vtr tap and pink sometimes.. Murco and Asda
ones for me .. strange but true ..

[Storm Trooper]

Check the cam guides in the head. I had the same a few months back coming back from Troon, only to find after being recovered home that one of my cam guide caps had sheared in half!!!

Sounded like a CCT rattle, but knew it wasnt as have manuals installed.

Back on the road again now. Managed to get a cap with the exact oil clearance for my head. (Lucky or I would of had to use the new head that I bought)