Chainsaw Repair

Hello,
My name is Don. My skill is with auto repair.(39 yrs.  ) Pleased to make your acquaintance.
My 156 blew up the cooling fins on the flywheel. I ordered an new one from Chainsaw Shed. It doesn't have the keyway or the steel center in the aluminum cast flywheel, just a raised aluminum boss where the keyway should be.
My question is: Has the manufacturer modified the flywheel in production? The date on the old one is "08" the new one is "12".
Thanks

Digging info up on model.   IPL's and owners manuals.  http://www.efcopower.com/resources/data-sheets

It doesn't have the keyway or the steel center in the aluminum cast flywheel, just a raised aluminum boss where the keyway should be.
My question is: Has the manufacturer modified the flywheel in production? The date on the old one is "08" the new one is "12".
Thanks

Crank key is molded into the flywheel.  Yep modifed in production and coils are different too.  Was  lookin @  the cranks coils yesterday they will not interchange much to my dismay.  Cut remember the NOS 165 w/bad crank brgs i think the coil is bad too.  That's why I was looking @ the cranks/coils.  Was going to try one off a 962, 956, CS56 those are project saws.
Shep

Shep are you saying he has to have the other coil to match the new flywheel?  Older coil dont work with new flywheels?

Old coil does not work w/new flywheel according to IPL I haven't tried one to see if old coil works w/new flywheel.  He will have to get old flywheel or new digital coil to go w/new flywheel.
Shep

Never mind on the muffler mod.  Think I will just leave it alone after checking the inside of muffler out and the outlet.

Big side outlet from factory shown from inside. Maybe open deflector up some.

 Inside 2 big holes on each side already.

 Saw cant have any time on it hardly. Rim not even marked. Piston looks like new.