OK, me too, after this...Bearing support is for the crank is one of the reasons for shake, balance factor is another.I have put an extra bearing on the front a G62 in place of the crank seal and found no difference in vibration...Same with the G23/G26, they have 2 on the front but don't shake any worse if the front is replaced by a seal..Some of the GoPed 23s are made that way, so they put anoutboard bearing on the other end of the drive spindle to support it better..The first A&M engines USED Sachs cranks..They were OK, except for the cases that were bored too big or too small for proper fit on the bearings..The first cantilever crank 4.2 MKII was no great advance either...The hardware store washer that took up all the thrust when the prop was tightened would bend and let the hub rub on the case, binding up the engine..The fix was a hard washer..Gave cantilever cranks a very bad name...The larger crankcases were EXACT copies of the chainsaw, so much so that a chainsaw front case would fit a machined rear case..Great design on the 3.2 crank, too..The Sachs 3.2 crank is smaller after it goes through the front bearing, and is easier to bend..How come the great designers didn't at least make it the same diameter instead of EXACTLY copying the Sachs ? And put another bearing in the front where the seal is ? There's room..And who designed the carb linkage ? If youre going to make a new carb insulator you could make it so the carb has the shaft vertical and go away with the sloppy bell crank that was bolted to one of the fins on the cylinder....
Can't blame it all on the evil DR from North Korea...