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ATLAS FLYWHEEL

Submitted by denis_curry on Mon, 06/02/2023
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Heavy Twins

Hello members, Recently I purchased an Atlas flywheel for my 650ss, which has the same stroke. The ss flywheel was missing when I bought the bike (as a basket case) and only had the webs for 650ss. Took it to be balanced and was told too much metal had been drilled out of that side of the flywheel.  Any thoughts and feedback would be much appreciated.  Have attached a photo of said flywheel. 

Regards - Denis

Attachments
Atlas Flywheel.jpg

Submitted by niall_topping on Mon, 06/02/2023

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Possibly somebody has removed that extra metal to balance some heavier rods, Carillo, for instance,

it should not be impossible to balance it, either replace some of the weight that has been removed, I have seen this done by sweating in plugs which can themselves then be drilled, or by removing the required amount from the other side of the flywheel, after all, you already have a heavier than standard crankshaft.

 

Submitted by jonathan_newton on Mon, 06/02/2023

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Screw in replacement steel. It’s a great way to adjust your corrections in position and depth. This will give you fine and reversible control of weight position. Once you have the desired ratio Loctite in place and stake the tops. Alternative, as Niall said, fill them to the circumference and send back to balancing shop.   Job done.

I take it you have reworked the crank to a condition ready for balancing? ;-)

Jon

Thanks, Jon for your comments, seems like a good option if it could be done that way. Do you know of it being done like that before?

Yes, the webs have been ground 10 thou, have to sleeve the cylinders and purchase new pistons.

There is not a lot of flywheels on offer out there.

Regards Denis.

 

Submitted by tony_wood on Mon, 06/02/2023

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Hi Denis. Not sure where you live, but T&L Engineering in Bedford can add ‘heavy metal’ plugs (tungsten?) to the flywheel and then dynamically balance the crank but it’s not a cheap job.

Good luck with the repair

Tony

Hi Tony .. thanks for your reply.  I live in NSW, Australia, so a bit far away from Bedford !! but I do appreciate your comments. Be disappointed  if i cant use it.

NOC site has been very helpfull with everybodys  comments.

Submitted by jan_nelder on Tue, 07/02/2023

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...of who you get to do work of this sort. In the UK, we have several companies that are very sound, and known to be so, but there are plenty of others without that reputation.I would put the word out until you get several people recommending the same places.

Submitted by philip_hannam1 on Tue, 07/02/2023

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I once fitted a Commando engine into a Featherbed Frame and the crankshaft balance factor had to changed to accommodate the lack of Isolastic mountings. After the engineers had finished drilling, filling and balancing it looked very similar to Denis' crankshaft.

 



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