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Falcon 55 Vibration

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Falcon 55 Vibration

Post  Callen on Wed Jul 12, 2017 7:57 pm

Has anyone a running falcon 55, if so does it vibrate. mine vibrates to the point of being such a uncomfortable ride as to me not wanting to ride it, the engine has been rebuilt by Villiers services so I assume that side of it would be OK so do they just vibrate. Sad

clive

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vibration

Post  piston 197 on Thu Jul 13, 2017 5:50 am

In a word NO, there should be no uncomfortable vibration that is not normal for any period machine of this era.
When the bike is stood still and revved up does the vibration increase with revs ? if so then it will be engine based, if it only does so when riding could be wheel balance, trueness etc.
Is it more noticeable in gear, maybe a tooth off the layshaft or final output gear, or possibly tooth off gearbox sprocket
Bottom line if it vibrates enough to make it uncomfortable to ride there is something amiss and some detective work will be required to find it ?
JH
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Virbration

Post  kerabo on Thu Jul 13, 2017 7:05 am

Silencers and pipes that bolt to the frame can make a bike vibrate.
I know it would be standard but it happens.
Is the engine throughly tight?
Even a loose fuel tank can create a hell of a noise and Virbration.

Might be worth playing about with this.

Ken
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Vibration

Post  Callen on Thu Jul 13, 2017 8:30 pm

Thank you for your comments, I have just run the bike stationary and yes it does vibrate and increases with revs and all the fixings are tight, Villiers fitted a new crank re-bored it and checked the flywheel so i am surprised that it vibrates like it does, the only thing it may be worth trying is to run it without the primary chain and see if it still vibrates, what do you think?.

Clive

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First thought

Post  piston 197 on Thu Jul 13, 2017 8:39 pm

First thought is apart from putting a socket and electric drill on the flywheel nut, it will be a bit difficult to start without a primary chain, but if you can do it, it will let you know if it is an engine balance problem ?
JH
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no primary chain

Post  Bigjim on Thu Jul 13, 2017 8:40 pm

It's going to be an interesting starting method. No chain no engine sprocket to be turned.
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Can be done !

Post  piston 197 on Thu Jul 13, 2017 9:02 pm

I had a friend who had a 1923 Bown with Villiers 350cc engine and he was too frail to start it, but could ride it, he used to start it with a cordless drill and a socket on the flywheel nut, it was just a matter of spinning it up with the decompressor in and when it was turning over drop the decompressor and away it went !
This method would work with the Falcon and no primary chain .
JH
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Starting

Post  kerabo on Thu Jul 13, 2017 9:12 pm

I started my 8E with a drill as it was on the bench unfinished.

I cut off a 3/8" socket extension and fitted it into my old 240v drill a plug spanner on the end and on the flywheel nut. My Drill on slow and hold tight but it started easy.
You need to hold the throttle open as you need two hands on the drill
Ken

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Last edited by kerabo on Fri Jul 14, 2017 4:17 pm; edited 1 time in total
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Starting

Post  MoscowFlyer on Thu Jul 13, 2017 9:34 pm

Just take off your belt, wrap it round the flywheel and pull it, job done! Just watch your pants don't fall down!!  Laughing
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Vibration

Post  Mollbhan on Thu Jul 13, 2017 9:56 pm

I remember a serious vibration problem with a mates bike aeons ago, he had used fibre washers on the head steady, worth checking.
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still vibrates

Post  Callen on Sun Jul 16, 2017 10:34 am

I have just run the engine with the primary chain disconnected, and it still vibrates so that excludes the clutch and gearbox, so it has to be the engine.

Clive

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Vibration

Post  piston 197 on Sun Jul 16, 2017 10:57 am

Well with gearbox disconnected it can only be the engine itself, the way the engine is mounted into the frame, or the exhaust mounting.
Obviously check all mounting bolts are the correct diameter and tight, and exhaust is firmly clamped both at the securing ring and the "P" clip around the silencer as well as the nut on the silencer exit being tight to push the silencer against the sealing cup and clamp.
If all of the above conditions are met sounds to me like it ought to be going back to where it was rebuilt ?
JH
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Virbration

Post  kerabo on Sun Jul 16, 2017 1:13 pm

Disconnect the complete exhaust from the frame and try it

Ken
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Re: Falcon 55 Vibration

Post  Jack Clegg on Mon Jul 17, 2017 9:37 am

I once had an accident on an 8E motor Falcon, where the car hit the big flywheel case & put the crankpin out of line. I had it realigned, but it was never the same & shook like a bastard after that. I suspect the same might be true here? TTFN Jack
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Re: Falcon 55 Vibration

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