better crank balancing

EYY

Member
May 22, 2010
159
1
37
#2
They should already be balanced? I'd assume something is wrong if you're searching for less vibration?
 

jaguar

Subscriber
Jul 29, 2000
1,339
27
60
South America
www.dragonfly75.com
#3
My '89 had too much vibration. I had to put buckshot inside the handlebars to make it livable. It's not the first time a manufacturer let part of the bike design be "close enough". If my next KDX is the same way then when I change out crank seals and bearings I will drill 6mm holes in the flywheels to see what happens. If its made worse then I'll have to take it apart and add more metal to that area instead of take it away. I'll post my results.
 
Jun 8, 2012
9
0
36
#4
When I replaced the main bearings, has less vibration.
Also you can crank itself has runout exceeds the limit.
 
Dec 6, 2005
340
0
55
#8
Unless you have a balancer you are taking a crap shoot, the odds of getting it "more balanced" are pretty low. I would get a new fly if you are so sure that is the problem, being a fairly good mechanic, I am sure you already know that as well as the consequences or reducing fly wgt.
 

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