550 mk 2 woes

[MattyF]

Any one else had this problem with mk 2 crank cases breaking around the back ? 
one of the saws was months old when it broke the other was just over 6 months and retired as the auto tune could not handle the change and ran like a bag of nails. 
I put them both too the back of the shed as I didn’t have time to address , now I’m on first thinning I need some 50cc saws that work! 

[billpierce]

I have a 545 crankcase that should fit if helpful

[MattyF]

19 minutes ago, billpierce said:

I have a 545 crankcase that should fit if helpful

I think replacing the crank case is totally last resort mate.. I was just wondering if husky Know there is a fault or weak spot in the mk 2 .

not one not of the first gen 550’s I’ve ever seen have broken here so the must have redesigned them to make them lighter @adw ? 
I know of one other person this has happened too on the mk2.