berg goes BANG

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you got it sickd,thats what happens.thats why i would never put the same balancer back in after a rebuild,poor little buggers do some miles hey.i've heard it a few times now,people putting the same balancer back in then before too long she goes bang again.
fwiw the balancer on the crank is a great idea,i know it probably does increase the crank flex cause the crank has to be a little longer,but you see the other brands how they have to have a separate balancer shaft sticking out the front of the engine cases like an adams apple.an extra shaft with extra bearings & bigger engine cases to fit it all in,it has to all add extra weight to the donk.take a look at the weight difference between a 09-10 fe450 & a 08 fe450,thats part of the reason an 09-10 models are 6.5kg heavier than the 08 fe450's,but weight positioning is better in the newies,so they sort of counteracted the extra weight difference.
..weed..
 
the berg cases are light my engine is 26-27kg depending on the scales, no estart no CB, the cases/barrel weighs 5kg, thats 2.5kg less than set of 08 crf250 cases + barrel then theres the cylinder head, ours is lighter, cam; ours is lighter etc etc.

most jap 450 engines are 28.5 -30kg.

08 kx250 2stroke engine weight 24kg. its got a steel frame

sickd the CB bearings only experience the centripital centrifugal or the like running loads of 1X engine speed so while the lil balls must spin twice as fast the radial loading on them from the mass of the CB isn't doubled.
 
bushmechanic said:
the berg cases are light my engine is 26-27kg depending on the scales, no estart no CB, the cases/barrel weighs 5kg, thats 2.5kg less than set of 08 crf250 cases + barrel then theres the cylinder head, ours is lighter, cam; ours is lighter etc etc.

most jap 450 engines are 28.5 -30kg.

08 kx250 2stroke engine weight 24kg. its got a steel frame

sickd the CB bearings only experience the centripital centrifugal or the like running loads of 1X engine speed so while the lil balls must spin twice as fast the radial loading on them from the mass of the CB isn't doubled.

yeah i was pretty sure the load was the same, just that the balls would wear out faster due to them spining faster year, its good to know that so that we do change the CB bearings at a rebuild, i like all this information :bounce3: love new information. :)
 

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