T120 top end rattle

[raptorkev]

when at around 3000 rpm and engine not under any load an hear metalicrattle open the throtle a touch and it goes engine does not smoke or use any oil
i checked the valve clearances and all fine but did notice yuo could push the rocker to and fro quite easey could it be this
any ideas

[rogerwilko]

Before you pull anything apart, check carby slide wear!

[raptorkev]

Before you pull anything apart, check carby slide wear!

forgot to mention new carbs

[wetdog]

sounds very much like a problem i had , turned out to be both inner valve springs on the inlet side had broken , never had this problem before or since but was told this is common on some Triumphs , mine was fitted with E3134 cams , mushroom tappet adjusters , and R followers if that makes a differance . went well

[raptorkev]

sounds very much like a problem i had , turned out to be both inner valve springs on the inlet side had broken , never had this problem before or since but was told this is common on some Triumphs , mine was fitted with E3134 cams , mushroom tappet adjusters , and R followers if that makes a differance . went well

looks like the heads coming off then

[Revband]

Then take the block off and check the little end bushes.

[wetdog]

there were no little end bushes on mine , what year is the bike

[Revband]

If this model doesn't have bushes then lets all hope the little ends are not worn.

[Rex]

Well, yeah, but if the bushes were worn he'd be stripping the engine to fit and ream new ones, and if the rods are "bushless" he'll still be stripping the engine to get bushes fitted. Pain in  the wossname either way, really.

{I know some people say small end bushes can be fitted and reamed in situ, but I'd rather do it properly on the bench}

[wetdog]

this is a job which can be done in situe . by turning up a suitable guide / mandrel and useing a adjustable reamer ( where are you as i have these tools already ) , you can use each rod eye in turn as a guide and from experience i know this method works well , it also means no bottom end strip down , pack the crank case mouths well , i think you will find there are no bushes fitted and i do not think this is the problem but would be interested to know what you discover . PS just remove the rocker boxes in order to see if you have a spring gone

[triman65]

If you have not started stripping it yet you could try using a hearth poker or large screwdriver like a stethoscope to try and determine were the noise is coming from.

[raptorkev]

If you have not started stripping it yet you could try using a hearth poker or large screwdriver like a stethoscope to try and determine were the noise is coming from.

thanks guys its a 65 unit motor ive tryed running the motor at stand still but dont seem to able to make it make the noise i am in plymouth soon as i get time will remove rockerboxes and check springs and hope this is the problem anyone tryed renewing springs without taking the head off ?

[Rex]

It's one of those jobs where it takes longer trying to avoid doing the job properly than it saves. It's only an easy morning's work to remove/replace the head, and grind in the valves while you're in there.

[wetdog]

no bushes fitted to these rods ( and its not a retro fit job ) , changing springs with out taking the head off , ive heard can be done but sounded like to much of a risk packing the chamber with greese and rag with piston at tdc , why bother its easy to remove the head , are you sure this noise is from the motor , has the engine been reboared and are the pistons new ?

[Duppy Conqueror]

any chance it might be preignition