Paging the rattlearti

My bike rattles:

It's rough when the engine's cold and suddenly stops once the engine's
warmed up. There's the odd ticking noise when it's warm but nothing in
comparison to what it sounds like when cold.

I was at the lights earlier and remember thinking that even my old
Bandit didn't rattle like that. It hasn't always done it and has got
progressively worse over the last few weeks.

Valve clearances?

 

Whinging Courier fumbled, fiddled and fingered:

Honda? Point at camchain and/or tensioner assy as a possible culprit.


--
Steve Parry

http://www.gwynfryn.co.uk

http://www.arrivedeprived.org.uk/

K100RS SE
F650
(not forgetting the SK90PY)

 

Camchain? It is a Honda. No, I say this because my XJ600 becomes a bit
rattly and noisy especially when warm bizzarely when it needs the camchain
tensioner given a wee tweak.

 

Bugger. Is that an easy job or one that isn't hard but just takes light
years to do?

 

2 out of 2, it's looking ominous for the camchain then.

This just stops, the noise I mean, it doesn't slowly get quieter, it
just stops.

Arse.

 

Its supposed to be a rat bike isn't it, try removing the "tle".

 

Whinging Courier says...

The tensioner is bolted to the inside of the camchain tunnel so its cams
out time...

When I spoke to a Honda mechanic about it on mine his opinion was that
you could get way with just removing the inlet cam. Mine rattles when
cold but hasn't got any worse over the last 12 months, so I can't be
arsed changing it.

 

Whinging Courier fumbled, fiddled and fingered:

I'm guessing the CBR is similar to a Kawa GPZ900/1000 design? If so the
camchain and tensioner assy will be at the end of the crank. It's not
too hard a job, only major thing is to make sure the cam timing is
correct afterwards.

If the camchain is in between cylinders 2 and 3 then it's a pain as its
an engine out, full tear down job (unless you use a split chain but the
tensioner should be replaced too)

Often, especially on early Kawasaki auto tensioners, the spring in the
device got "weak" and taking the assembly off, replacing or stretching
the spring a little resulted in a quieter camchain.

--
Steve Parry

http://www.gwynfryn.co.uk

http://www.arrivedeprived.org.uk/

K100RS SE
F650
(not forgetting the SK90PY)

 

Paging Muck

That's the thing, there's a ticking noise which you can only hear when
the rattle stops and this was the camchain tensioner, I thought.

I really hope it's only the valve clearances.

What's the worst case scenario of not fixing the camchain tensioner, a
fucked engine I suppose.

 

Whinging Courier fumbled, fiddled and fingered:

I've seen more than one engine that the chain had eaten away through the
alloy of the cam tunnel to the point where it had reached the outside
world, much oil pissing out ensues, the internally ground alloy filings
did'nt do much for the bearing surfaces or the oil filter either. As you
supposed a f*cked engine. OK ish on a little 125 ... potentially lethal
on a 1000cc.


--
Steve Parry

http://www.gwynfryn.co.uk

http://www.arrivedeprived.org.uk/

K100RS SE
F650
(not forgetting the SK90PY)

 

Probably but as I've never had either of those apart...

It's an in or out job and it (the tensioner) is on the cylinder head
according to the HBOL, but in their infinite wisdom, the 'refer to fig
2.1 and 2.2' photos don't exist. Cunts.

I was thinking about the spring stretch as buying a new one from Mr.
Honda would mean a gamble in that it might not just be the spring I
need.

What's the worst that could happen, the chain jumps and puts a valve
through a piston?

 

I'm betting cam chain. My Bandit has a manual cam chain adjuster, and
when it needs adjusting, it starts to rattle when cold and stops when
hot. Aren't those CBR lumps a bit prone to cam chain rattles?

 

Whinging Courier says...

Do the valves, balance the carbs and then how bad it is.

The camchain could jump a tooth leading to a valve hitting a piston and
bending a conrod, leading to the conrod breaking and exiting through the
cases, impaling itself in your gonads and chucking oil all over the back
tyre causing you to crash and burst into flames so dying a horrible death
in agonizing tortured pain, only to be dammed into the very far reaches
of Hell....

 

OK, just so I can get a better understanding of what causes it, why
would the tensioner make the camchain rattle when cold and not warm?

 

<eyes widen in awe>

Coooool!

 

Feck.. that's a bit wanky, putting the tensioner inside the camchain
tunnel? I mean, there's no external bits at all?

Get those adjusted, and see how many rattles it takes out.

Yeh, your cam chain jumps a tooth and all hell can brake loose.

 

Bear fumbled, fiddled and fingered:

Yes, just had this vision of full chat on a 125 seizure at 65 mph ...
controlable.
Whereas a full chat seize on a 1000cc would be a bit more "eek" inducing

bugger ... now my heads twirling trying to recall them too .. thanks for
that )




--
Steve Parry

http://www.gwynfryn.co.uk

http://www.arrivedeprived.org.uk/

K100RS SE
F650
(not forgetting the SK90PY)

 

There is on the 600 but the pictures of the procedure of the thou are
missing.

This is what I want to do. Fancy a trip up here? I'll buy the curry.

 

Whinging Courier fumbled, fiddled and fingered:

expansion ... when warm the heat expansion takes up some free play.


--
Steve Parry

http://www.gwynfryn.co.uk

http://www.arrivedeprived.org.uk/

K100RS SE
F650
(not forgetting the SK90PY)

 

Right, ok.

Cheers.