Ballance the Crank. Yay or Nay?

I haven't seen any opinions on balancing the crankshaft. Is it too much effort for too little gain, or is it not possible in reality.? It would seem that instead of fixing a very early problem, Norton ISOLATED IT. Views gentleman please, as my bottom end is coming apart as I speak.

Dynamic balancing is not expensive and well worth the effort, especially since you have the engine apart anyway.

Hi

Ballance the crank, it will make the motor run smoother, it don't cost that much to get done, I have my 850 Norton crank ballanced but I had to as I put the motor in a Featherbed frame and use solid mounts, but even in the standard Commando frame it will make a diffrence, it cost me $49 in 1980 when I got mine done, but you need to take every thing that is connected to the crank when you get it done, well worth it in the long run...

Ashley

AussieCombat said:

I haven't seen any opinions on balancing the crankshaft. Is it too much effort for too little gain, or is it not possible in reality.? It would seem that instead of fixing a very early problem, Norton ISOLATED IT. Views gentleman please, as my bottom end is coming apart as I speak.

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If by early problem you refer to vibration inherant to a verticle twin, dynamic balancing will not remove that. It will reduce vibration caused by uneven weight of the moving parts...such as rocking motion.

Proper aligned and adjusted isolastics can take out a wide range of Balance Factor vibration but not the side to side imbalance which is more a buzz than stronger engine vibrations, like if something on power until solidly touching chassis.

The most expense would be changing the BF, just dynamic balance is simpler so cheaper. About every report says its was detectably worth while. Also good to have the crank run out checked and corrected and of course inspected for cracks.