crank balancing

[galpharm]

I am building a 225 Mugello with 60mm crank and 1mm packer. new light mugello piston
Also altering porting to 175 exhaust and 150 inlet with 30mm Mikuni and Jl3 exhaust.
I have talked to a local 2stoke motorcycle tuner that can balance cranks but we are unsure of balance percentage to use.
Any ideas

[tony]

try Steve on this website mate.
Professional balancer.
http://www.vibrationfree.co.uk/

[galpharm]

Thanks Tony.
Talked to them today and they balance dynamically which meens taking in short block which i may do at a later date.
After another conversation with the tuner we have decided for mid range we are going with 65% as this is what he uses for single cylinder motorcross bikes.
So we are going to have a go and see what happens.

[RinB]

This might help a bit taken from cambridge site

Percentage Of Balance For Pistons
Piston Piston Weight *Approx
Includes all Aux parts Percentage of Balance
Mugello / Imola 186 250g 50.65%
Mugello / Imola 200 292g 44.50%
Mugello / Monza & TS1 336g 38.5%
Mugello / Monza 240 /250 336g 38.50%

Smiffy

[tony]

Thanks Tony.
Talked to them today and they balance dynamically which meens taking in short block which i may do at a later date.
After another conversation with the tuner we have decided for mid range we are going with 65% as this is what he uses for single cylinder motorcross bikes.
So we are going to have a go and see what happens.

No probs mate. Steve is a top guy. For future ref he will require the whole setup, barrel flywheel motor etc and an idea of what angle the engine runs at.

[galpharm]

Still confused. Searching the web i have found that 50%-57% is quoted as best for single cylinder.
We are off to Bristol Classic bike show today so i will ask a few questions

[galpharm]

57% or 65%?