Rattling noise under acceleration

Dreamer 69

Joined
Oct 23, 2010
Messages
13
Location
Australia
Hi all, hope all is well.

Im here once again for some advise on an issue i have, i purchased my 2008 1300 about 4 mths ago it now has 105,000 will full
service history. My issue is that only under moderate to hard acceleration there is a rattling sound the harder you you twist the
throttle the more prominent the noise is. When you are cruising at whatever speed it is as quiet as a mouse. Even in neutral on the
stand and you whip the throttle its there no where near as prominent as when your riding it but still there. By the way i can feel the
rattle through the pegs as well which made me think maybe uni but then i thought if was the uni why is it still there when in neutral
no were near as bad but still can just hear it. Am really hoping this is a fairly easy fix. Any suggestions would be greatly appreciated

Thanks Guys
 
Hi Jeff
Mate i use 98 in the st and i thought at one time maybe im just hearing each pot fire but being not so mechanically minded
dismissed it as just a thought....
 
Starter Valve Sync - ??? Dont have a 1300 but remember reading some post and starter valve sync solved a couple of issues and its not a difficult procedure .:dr13:
 
Al st1100 said:
Starter Valve Sync - ??? Dont have a 1300 but remember reading some post and starter valve sync solved a couple of issues and its not a difficult procedure .:dr13:
Click to expand...
Sorry no. that is a process to change in idle and fuel mileage, not under acceleration. Strange without hearing it, and could be engine but consider the drive train, clutch chatter possibly? Any way to record the noise? Any idea of where it is originating? Engine front, out the exhaust? Need some more info. The 5 way tee is what you could have been thinking as well Al. It clogs and causes issues.
 
jfheath said:
My first 1300 A6 used to do it from brand new, and it was worse when it got hot - particulalrly in Summer climbing the high mountain passes. I discovered a few things :

The Higher 98 RON fuels in the Uk reduced this significantly.
Thicker oil for hot weather 10w40 instead of 10w30 made quite a difference.
It seemed to prefer fully synthetic oils
Ethanol based fuels made the problem significantly worse eg E10)

My current A9 model - which is now 5 years old (built 2013) has just started doing it, but using 98RON instead of standard 95 makes the problem go away. 98 is more expensive but i find that if i fill up before the tank is empty and alternate, then the combined 95/98 mix works well.

Not all fuels are equal. Try filling up at different places and with different brands when the tank is low on fuel ( so that it makes it easier to attribute the change in fuel to any change in behaviour) and avoid the places that don't have a lot of veicles passing through so there is more chance of getting fresh fuel.

I've no experience of having the knock sensors fail ( not that i know of) , but that might be worth a bit of research.

Note that the handbook mentions that some pre-ignition is normal under acceleration.

Do you have the OEM spec exhausts, air filter and the recommended spark plugs fitted ?

There is also a possibilty that the balancer shafts are a little 'slack' which results in a rattly engine particulalry noticeable under acceleration. These can be adjusted to reduce the gear 'lash' - front left side of crankcase. Too little lash and the engine whines, too much and it rattles. Its an easy adjustment with a screwdriver and a stethoscope (or scredriver to the ear). Well worth checking - but you need the left lower cowl off.
Click to expand...
John, bit of a :hijacked: but interesting to read your views on Super Unleaded. There was a thread recently on MPG and the merits or not of Super Unleaded. My view was whilst I couldn't say what difference it made to MPG I was totally convinced on its merits as a fuel system cleaner and on the general smoothness and rideability of the 11. The Mustang's basically got up above and shot this Spitfire down, comments were along the lines of, "why waste money", "They'll run on kerosene", etc.
So thanks for confirming my own belief that in the UK at least SU does make a difference. I figure the extra £50.00 a year in fuel costs is more than repaid in the smooth feel it delivers.
Ta me duck.
Upt'North.
 
Not an expert but my exhaust clamps on the rear of the exhaust has rusted and one is loose ,this produces a rattle ,look all over the bike before taking it apart ,something may just be loose
 
Heat shields inside fairing pieces (lower cowls)? Might they loosen with age? Or is your rattle more like the knock sound of too low octane fuel detonating?
 
Anyone explain that the V4 in the ST13 will growl and grumble if you give it too much thrpttle and try to accelerate hard when the RPM is too low?
 
T_C said:
Anyone explain that the V4 in the ST13 will growl and grumble if you give it too much thrpttle and try to accelerate hard when the RPM is too low?
Click to expand...

Exactly and completely normal. You can make it a little better by tightening up the counter balance shafts. I did this procedure about 3 weeks ago. Easy enough and there are several good threads here explaining the procedure. The growl will get a little better but will always be there. Should happen between 2,500 - 3,500 (ish) rpm.

I think most of the guys on here refer to it as 'a box of rocks'! This is my opinion of what you are hearing anyway. And apparently T_C.
 
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Thats obviously what im hearing as well as im so used to inline 4s that just roar under hard acceleration and not rattle
 
Its because you have the rpm's too low for the amount of throttle you are using. Down shift and bring the rpm's up and it should go away.
 
Dreamer 69 said:
Thats obviously what im hearing as well as im so used to inline 4s that just roar under hard acceleration and not rattle
Click to expand...

The ST13 like to be upwards of 3k rpm before you open the throttle all the way. You can drive it at a lower rpm, but no hard acceleration.
 
Dreamer 69 said:
Hi all, hope all is well.

Im here once again for some advise on an issue i have, i purchased my 2008 1300 about 4 mths ago it now has 105,000 will full
service history. My issue is that only under moderate to hard acceleration there is a rattling sound the harder you you twist the
throttle the more prominent the noise is. When you are cruising at whatever speed it is as quiet as a mouse. Even in neutral on the
stand and you whip the throttle its there no where near as prominent as when your riding it but still there. By the way i can feel the
rattle through the pegs as well which made me think maybe uni but then i thought if was the uni why is it still there when in neutral
no were near as bad but still can just hear it. Am really hoping this is a fairly easy fix. Any suggestions would be greatly appreciated

Thanks Guys
Click to expand...
Hi, did you ever find a solution for this problem rattle?
I just bought a 2004 pan in mint condition apart from some light corrosion on the left handlebar no damage at all. Only 14000km.
But now I discovered than like you under hard acceleration also a loud rattle,, a metal clattering noise. Under normal light acceleration nothing. I'm worried this would mean damage in the engine? Is this possible?
I bought this 16 year old pan because of the reputation of " bulletproof" bike.
I hope this isn't a serious cost?
Thanks in advance.
Kind regards
Dieter
 
Hi - I replied to this thread ages back, but I had a severe prune of my posts recently, and deleted about 2,000 of my old posts - including this one. My 2006 used to do it quite a lot from brand new - fortunately, @Upt' North quoted my entire post - which is in post#7 above - 23 Oct 2018. - Click on the 'click to expand' text in the orange quoted bit. Brief summary: hot engine, thin oil, type of oil, low octane fuel, 'stale' fuel, ethanol mix - all made a contribution to this engine rattle or 'knock'.

Do the usual stuff - put in some quality fuel from a petrol station that is popular (ie the fuel doesn't sit around in the tanks for weeks on end), get some fuel injector cleaner and put it into a couple of tanks of fuel. Ride the bike without putting strain on the engine - ie keep the revs up high for long runs, and as soon as possible give it some quality fully synth oil 5w-40 0r 10w-40. I'm not saying it cured it, but all of that sure made a difference. It would always do it when accelerating really hard up steep hills if the engine was already hot.

The sound is not the same as the balance shaft rattle. That is a lower pitched 'gargling with marbles' sound. The pinking is like someone rattling a bunch of keys - so before you do anything else, make sure you don't keep your keys in the fairing pockets.
 
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