Author Topic: Speaking of vibration  (Read 13759 times)

Offline Hubie

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Speaking of vibration
« on: 12.07. 2010 06:46 »
Can anyone tell me a good place to get my crank balanced here in Victoria?  Might just be the next step in fully sorting this A10 of mine.  She runs great now but vibration kills the top end.

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline dpaddock

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Re: Speaking of vibration
« Reply #1 on: 12.07. 2010 13:30 »
Are the engine plates good and tight? Is the head steady fitted properly?

David
David
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Re: Speaking of vibration
« Reply #2 on: 12.07. 2010 14:41 »
G'day Dave,
                   David took the words. My cafe developed a bad vibe around 3grand and a horrible knock under load. I had visions of big ends and or mains failing, till I noticed the rear top engine mount bolt missing and the lower rear bolt loose. Tightened the lower and got home with most of the vibe gone.
 There was a bit of a discussion on balancing here a while back. 54% std, 65% racing, I went as high as 76% on my A7SS racer. Not that hard to do yourself but any motor shop that grinds cranks should be able to balance them.
 Just had a look back. Josh posted this link. Very interesting. http://www.ajs-matchless.com/article_read.asp?id=26
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline MG

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Re: Speaking of vibration
« Reply #3 on: 12.07. 2010 14:47 »



 *lol*
Found that on the net recently, hits the nail on the head.
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

www.histo-tech.at - Restoration, Repairs, Racing

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Offline Hubie

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Re: Speaking of vibration
« Reply #4 on: 13.07. 2010 01:38 »
Head steady is good as i just fitted new gaskets to the rocker boxes, will double check the engine plates, the front ones are fine after removing them when doing work on the dynamo.  Gotta check the rear ones, but i suspect the balance factor on the motor is not as good as it could or should be.

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

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Re: Speaking of vibration
« Reply #5 on: 13.07. 2010 12:54 »
G'day again Dave,
                            before stripping the motor down run a few tests first. Compression same in both hot & cold, timing same on both (use a strobe and degree wheel) and plug colour identical on both. Uneven running caused by one or more of the above will cause vibes.
  The balance of the crank may need attention if you have pistons of greatly different weight to the originals or bored to 80 thou or more.
Try to eliminate everything else first.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline mark

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Re: Speaking of vibration
« Reply #6 on: 14.07. 2010 07:06 »
Dave if you still want someone in Melbourne try Dyson Motorcycle Eng Ph 9390 2826. They balanced my brothers Triumph crank and he seems happy with their work.
Regards
Mark
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Offline Hubie

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Re: Speaking of vibration
« Reply #7 on: 15.07. 2010 06:57 »
G'day Mark,

I rang Dyson and was very surprised at how helpful he was, and blown away with the price he quoted to balance the crank if I supply it to him sans crank cases.
I have gone over the engine plates and checked the everything else out that was suggested so I might have to order a full gasket set from SRM (unless someone knows where to get one cheaper!) and get back in touch with him.

Cheers,

Dave
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline zitman

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Re: Speaking of vibration
« Reply #8 on: 15.07. 2010 21:03 »
For gaskets, parts etc I have used DargAnFly, Kidderminster Motorcycles and TMS.  And of course EBay.

Z

Offline mark

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Re: Speaking of vibration
« Reply #9 on: 16.07. 2010 04:21 »
Dave  I got my gasket set from British Spares in NZ for $NZ120 or about $A100. I'm not sure what Modak charge but the're worth a call at least.
Regards
Mark
55 road rocket




71 Norton Commando Roadster 750


Australia

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Re: Speaking of vibration
« Reply #10 on: 16.07. 2010 11:09 »
G'day Dave,
                    I got my last set from Burton's for about $65AU landed. I use them as templates to make my own from gasket paper from Repco.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline Hubie

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Re: Speaking of vibration
« Reply #11 on: 10.09. 2010 06:57 »
G'day all,

Have booked in to get the crank balanced at Dyson's, ordered a full gasket set from SRM ($59 landed) but am leaving out the belt drive dynamo kit (more pricey than i can afford right now) and the 21 gearbox sprocket.  Thought it would be best so see what the result is like after the balancing is done.  The barrels have had a hone run through them so it will be ready to be re assembled as soon as the crank is balanced which I should have back in about a week and a half.  Looking forward to it!

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline BSA_54A10

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Re: Speaking of vibration
« Reply #12 on: 10.09. 2010 12:16 »
So with a bit of luck you will be at the 6th BSA National Rally in Maitland on October 1-3 .
If so have a chat with Steve who has just put a belt primary on his A10, unbelievable difference.
I hope Trev( from OZ )  will be there as it is right in his back yard and I think Musky is coming along as well.
that is why we hold m so riders can do the touch feely thing which can't happen over the net.
All you with those smirky grins wipe em off right now. It is touchy feely the motorcycles, not the riders.
Bike Beesa
Trevor

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Re: Speaking of vibration
« Reply #13 on: 10.09. 2010 21:02 »
G'day Dave,
                   what % balance factor are you getting done?
I have a SRM dyno kit in the cafe and a Lytedrive (Melbourne) kit in the '51. So much quieter and less maintenance than the chain.
I'll second the belt primary too. So smooooth, does away with the cush drive and with the sNorton Commical clutch no slip or drag. From Lytedrive as well for $1000AU. Save your pennies, both mods are well worth it.
Yes Trevor, sent my entry away earlier this week. Freshening the top end of the '51 for the trip. Removing the wife's seat to bodge up a rack.
I think Trev has to work that weekend, but I'm planning to swing by that way on the return trip.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline Hubie

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Re: Speaking of vibration
« Reply #14 on: 10.09. 2010 22:21 »
G'day again,

I'm going for 60-62%.  Has been recommended as the best factor for the bike.  I will eventually get the dynamo belt drive kit but it is not urgent.  As for my clutch, it works perfect with no slipping at all so no issues there.  Will be very exited to get it back together and on the road.  Will be working as far as the meet goes, but one day!!!  it is my daily ride so the sooner the balance is done, the sooner i can reassemble it.

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!