In general and also specific to a 2007 wr250f with a 290 big bore piston.....

Has anyone added tungsten weight to the counterbalance shaft and or crank to equal or exceed the stock piston weights balance factor (regain balance).?

which reminds me I need to find out how much more the large bore piston weighs than the stocker.

old enduro competitors need low vibes for their old gnarly mitts!