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Messages - bigmockuk
1
« on: August 09, 2025, 01:08:39 PM »
i should probably have honed the cylinders,i just gave them a good visual check,oiled them up and rebuilt the engine,as to end float on the arms,murf, i can certainly check n see what their at and compare to what you have.the fact the bike was running fine for the first 100 miles driven at relatively low speeds with no harsh acceleration when this fault developed,ive been looking for obvious things like damaged parts or out of place parts and not really gave thought to worn parts so as theres nothing obviously out of place i`ll need to start checking tolerances in various parts especially rocker gear.
2
« on: August 05, 2025, 12:35:10 PM »
Cheers for that Murf,its certainly in depth,and gives food for thought,im gonna step away for a few days n get some fresh perspective on things,i`ve got two bolts de-threaded now inside the top breather cover probably due to amount of times i`ve had it apart in last few weeks,so i`ll use thread inserts that i have to sort them.the bike is 48 year old but lay in a garage for 35 year so was only really on the road for like 13 year and covered around 25,000 miles,i would`nt expect to see any real wear n tear,it was running fine until recently then this noise developed so more sudden than gradual,it does have a loud clutch basket that i need to look into so the way ahead is to strip top half completely down n take measurements and renew all gaskets,do you know off hand where i could get a hold of shims thin enough i could use on side rockers? i`ll post back once i`ve had time to go through things and determine whats wrong and like you say,hopefully have it running sweet again soon 
3
« on: August 03, 2025, 12:43:26 PM »
nursejulie thats my thoughts too,i was so sure it sounded like a very loose tappet,or damaged shaft,another member wrote about a 400cc having side movement at the tappets even though that bike has springs to help prevent sideways movement,up close,some of mine look nicely rounded off but others have slight imperfections,almost pitted,not sure if that could cause it.my tappets have a lot of sideways movement im thinking putting shims in there might help.im still positive its related to the rocker gear somehow.
4
« on: August 02, 2025, 10:12:16 PM »
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« on: August 02, 2025, 09:43:33 PM »
hi guys,im not long finished building the engine back up,decided to strip it back down and fit rubbers to camchain tensioner,but no joy! rattle is still there,the camchain guide is fine and i dont believe the chain is worn,after fitting chain to the sprocket and sprocket to camshaft i loosen adjuster nut when no1 cylinder is on commpression stroke and advance spring is in alignment with timing notch then the tension on the chain seems fine,nothing loose.the only thing i have`nt checked on the top end is to see if there was a broken inner valve spring which i doubt.i`ll upload a short video i took of the noise to youtube and post the link,again,cheers for allyour input on this.
6
« on: August 01, 2025, 02:17:03 PM »
was so sure i`d find somethingoutof place upthe top end like a damaged rocker shaft or valve spring but found nothing,so this noise must be resonating upwards from down below and the only thing i can think of is the tensioner rubber at the bottom,as the camchain is moving round the tight spot that a chain has must be pushing the tensioner against the groove it located in and resulting in the tapping sound so thats the next job,hopefully get that done before the weather changes in the next few days 
7
« on: July 31, 2025, 11:28:50 AM »
so Bryanj you think maybe whenever the tensioner is removed the rubber may stay put? i`ll upload a small video to youtube at some point later today of a recording i took of the noise and post a link here if anyone can determine what it could be,this has only occured recently,the engine has been sound up to now so im asking myself was it something i disturbed? in which case its only been the tensioner .i hope to take the rocker cover off later and remove the shafts to check things are ok there and if not i`ll go further down to possibly fit new dampener rubber,im too stubborn to let this get the better of me but its chipping away at me haha.back to work shortly too then time will be against me.
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« on: July 30, 2025, 10:28:59 PM »
ye Bryanj just fitted new ones the other day too,just seen on DS that the tensioner is supposed to have a rubber dampener fitted at the end,mine doesnt so could it even be that resonating upwards
9
« on: July 30, 2025, 10:03:06 PM »
Hi Guys looks like its back to the drawing board :'( started the bike up and tapping noise is still there even tho tensioner is in pace,gave it a few revs and noise didnt sound too bad so went for a run but 5 mins later the noise became a concern,loud tapping sound which rises with the revs and you would put your last buck on it being overly loose tappet,but is definately coming from the top end left hand side,right hand side has no sound at all its running quite,this sound is from the top left so thinking its either damaged valve springs on no1 cylinder or damaged rocker arm shafts,ive already had no2 valves out to check them and lapped the valves in too
,now wish i had did no1 also.i`ll take rocker cover off tomorrow and take shafts out to inspect things,if all looks good its head off time again to check no1 valves,strangely enough when i first got the bike i had to replace no1 valve and guide as there was a whole lot of side play in the inlet valve but all the rest were sound,weird,what could possibly have worn the valve away to such extent it wore away the guide! any ideas im all ears lol
10
« on: July 30, 2025, 12:24:43 PM »
Cheers Murf appreciate it,i`ll check in later todady 
11
« on: July 29, 2025, 10:31:23 PM »
just to finish putting things back together tomorrow and give it a try now that tensioner is in place,Cheers guys for your help and assistance!
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« on: July 29, 2025, 10:26:12 PM »
having to upload 1 pic at a time as it wont allow 2 or more ?
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« on: July 29, 2025, 10:23:24 PM »
got engine top half stripped down today and can verify that tensioner is i the wrong place,i also noticed a bolt had worked loose by quite a bit so eith vibration or PO not nipping it up
14
« on: July 29, 2025, 09:37:35 AM »
ye definately murf,that pic posted by johnny is exactly the same as mine so its hitting that chain,i hope to take it apart again either today or tomorrow so i`ll post my findings cheers
15
« on: July 27, 2025, 10:18:33 PM »
jonny4428 that pic you have of the marks on the tensioner is identical to the marks on mine!! which means its still not in place  cheers for the other pic it lets me see what to look for when i drop the pan,ive seen two vids on youtube now that shows the tensioner being fitted to the barrels prior to lowering the barrel? might be a good idea to do this,could take away the guess work
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