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E: Engine Rattling Comet

Colin

Well Known and Active Website User
VOC Member
I've just got my Egli Comet back on the road after a few years SORNED. Straightforward recommission, a general check up , new battery, oil tank clean out change all oils, reset all clearances, adjustments etc new plug, and a carb re-tune check chain. It started easily and, after the carb tune ticked over regularly and went well.
I had acouple of rides clocking up around 120 miles in total. It accelerated well was happy to cruise around 70 mph and still had some left. Generally no problem, then on the next ride, at 50mph in top (and corresponding revs in lower gears) a rattle started up. Below 50 it sounded exactly like it always has.
The rattle sounds exactly like a loose metal mudguard. I can find nothing obviously loose and have to conclude it is in the engine.
It runs as sweetly as ever below 50 and sounds about to fall apart above that,
Has anyone any ideas please?
 

Robert Watson

Well Known and Active Website User
VOC Member
Time for a stethoscope? I had a nasty rattle once, turned out a loose tank bolt had let the tank contact the oil filler tube on the UFM. Took a bit of sleuthing to find it.....
 

Trickymicky

Website User
VOC Member
After a long lay off, the innards of my silencer came adrift, which started with a rattle, and ended with them blocking the tail pipe.
 

macvette

Well Known and Active Website User
VOC Member
I've just got my Egli Comet back on the road after a few years SORNED. Straightforward recommission, a general check up , new battery, oil tank clean out change all oils, reset all clearances, adjustments etc new plug, and a carb re-tune check chain. It started easily and, after the carb tune ticked over regularly and went well.
I had acouple of rides clocking up around 120 miles in total. It accelerated well was happy to cruise around 70 mph and still had some left. Generally no problem, then on the next ride, at 50mph in top (and corresponding revs in lower gears) a rattle started up. Below 50 it sounded exactly like it always has.
The rattle sounds exactly like a loose metal mudguard. I can find nothing obviously loose and have to conclude it is in the engine.
It runs as sweetly as ever below 50 and sounds about to fall apart above that,
Has anyone any ideas please?
Try running on the stand, increase revs until you hear noise. If its in the motor, stop if not you may be able trace the resonance. It doesnt take much contact to cause rattles.
 

Chris Launders

Well Known and Active Website User
VOC Member
You will find it easier with an assistant, to hold the bike and operate the throttle, also to triangulate where the noise is coming from, riding it will only disguise where the noise is actually coming from.
 

vibrac

Well Known and Active Website User
VOC Member
I worry more if it doesn't rattle :)
seriously that silencer suggestion is a good starter there is no corrosion protection in there and its been empty of fumes and heat a long time
 

Gary Gittleson

Well Known and Active Website User
VOC Member
And if it's something like a loose mudguard, try rapping it with the heal of your hand. A friend's Rapide had a loose bolt on one of the front mudguard stays that I found by that method. It took several shots to find the one loose bolt. My friend doubted my sanity for a bit, but then all was put right. Let me see. Person, woman, man ... I'd better stop there.
Gary
 

erik

Well Known and Active Website User
VOC Member
The magneto cowl likes to rattle,even if the screws are all fixed. Erik
 

peter holmes

Well Known and Active Website User
VOC Member
I don't think this will apply to a Comet, but a rattle that drove me insane until I tracked it down was the chain oiler on a twin, if the pipe just brushes the chain the rattle resonates through the UFM, I had totally convinced myself it was the magcowl loose on the bottom studding, so I epoxy'd the studding into the magcowl, but the rattle was still there driving me crazy, I was so relieved when I discovered the culprit.
 

erik

Well Known and Active Website User
VOC Member
This an Egli Comet with I suppose no chain oiler and different ufm.Regards erik
 

Colin

Well Known and Active Website User
VOC Member
Thanks Gentlemen.
As of now I still don't know what it is, but I do know it is NOT, a dodgy silencer, a loose mudguard, or alien "rattle" messages from outer space.
I will keep at it, or take it to my local Old Bike Repairers, who have been excellent in the past:)
 

A_HRD

Well Known and Active Website User
VOC Member
Colin,

Take off the 2 tappet covers and check there's oil in the tunnels and covers. I once had a blocked oil supply to the exhaust rocker and it was running completely dry and making hell of a din!

Also, drain the sump and check there's no metal debris in the oil - if not, at least you'll sleep better...

Peter B
 

Colin

Well Known and Active Website User
VOC Member
Chris. Agreed ,but I know people who know more than me on this one.
Peter. Good idea will try that one tomorrow
Tim. Not yet, awaiting my assistant mechanic (aka wife) to find time to work the throttle.
 

Colin

Well Known and Active Website User
VOC Member
SORTED! My absolutely invaluable assistant mechanic became available for a consultation and a bit of throttle blipping this morning, and it is now sorted.
Problem(s) were twofold. The tank sits over the top tube/oil tank on a shaped former, and at the back sits on two thick rubbers on the rear sub frame rails. All held in place by a strap over the top pulled down at the rear by strong rubber loops. The two rubber blocks on rear sub frame rails had completely flattened over time allowing the petrol tank to move (vibrate) both up and down and slightly sideways. Two new blocks made from specially selected hard foam kneeling mat, and a bit of padding from an equally specially selected pink camping mat (If I remember correctly abandoned by Bill Easter several Internationals ago![as I previously pointed out to my assistant mechanic."It may come in useful sometime"}) and that was that
The other problem was a surfeit of tools in the fibreglass side tool box pushing out the lid and rattling around
(lots of tools "Blessed is he who expecteth the worst, for him shall I not disappoint" 1st book Pessimists Chap 1) Solved with more pink sleeping mat and a cunningly drilled hole through the lid of the box and through the inner box and then pinned in place with a long thin, headed pin

But the best bit is still to come. Went out on a testing run and really giving it some stick, and all running well ,On a long clear "A" road up. hill I rapidly came up behind 3 modern bikes, admittedly just pootling, dropped into third and shot past and changed up, giving them the benefit of a Comet on song with an absorption "silencer" Left them for dead! Several miles on round the roundabout and heading back the same way, I gave them a cheery wave, and would have loved to see their faces!
Many thanks to all who gave advice, at least it eliminated what was not the problem, and I,m glad I persevered and solved it. Bike cruised happily at 70 mph down the M20 and did briefly run up to, oooh a bit more.!
A Comet on song is a perfect cure for the Covid Lock Down blues.
 

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