weird noise in the top of the engine kat 400?

[superfly]

Hi lads,

I was having a look over on the bike tonight and she needs love.
I think I am going to have to fork money in it this year again (chain, shock absorber, carbs), but I might have to do something else.

I was listen to all of it running the bike as a noise coming from the top of the engine, a bit like a rattle sounds, between the chain and the exhaust I never notice it.

But now I do need to do something. I am think the only thing which could rattle will be the belt tensioner or the belt it self?

Any idea if I am heading in the right direction or not?

Does someone as an idea of the cost involve in parts and/or getting it done by a garage place?

I never done it, but I don't think it will be too hard.

What do you reckon?

[Pedda]

I'm not familiar with 400 cc engines. Do they have a belt? I thought of the cam chain tensioner in the first place, maybe you'd also check the valve clearances.

Might even be a stange noise coming from the exhaust gaskets leaking...

[superfly]

There is a chain as far as I know, I thought about the valves clearances too.

I don't think this kind of rattle come from the exhaust gasket leaking, as the noise seems to be really inside to me, however it is worth to have a look definitely.

It sound that next weekend, I have a big mecanic week. I have the cage to finish and the bike to change the carbs...

[Katgeezer]

Really hard to say without hearing it Arnaud.

Camchain is the most likely but valves also worth checking. Fossie's done a million miles on his so might have a different insight.

[fossie]

As Katgeezer said my 400 has been round the clock and the camchain has never been a problem , but the bike was in regular use.
camchain tensioners do stick if not used too often, unfotunatley unlike the earlier kats there is no external wheel to jolt it.
I would howver check valve adjustment first , also carb balance , if you've not already done so.

Jimmy's 400 makes the sound you describe and I feel it is valves , the tolerance is very small and witha short stroke engine the tapping sounds like a rattle.

[superfly]

ok sounds lads, I will start from there, today I could not go to work the bike would not start....