I caught mine in time MS660 (CrossPerformance)

I think I caught my Cross Performance just in time. Only about 15 tanks of 40/1 tuned at 13500 rpm.
A lot of plating came of on exhaust side. TAUGHTS anyone. Bad photo but there's a lot missing.

 

All and all they are junk.

 

I think before using AM cylinders one must be sure he has a competent knowledge of what to look for and what corrections need to be made before insatlling them so they run right. They can be a decent cheap option to the right people who can for see problems. But nothing compares to OEM for quality and service life. I don't want to judge the OP's intentions starting this thread, its chainsaw related & he's asking for advice/help. But in the back of my small brain I wonder if threads like this are a concocted ploy to have a new replacement sent to them at no cost. It happens a bit and I'd hate to see the Gentleman's generosity to be mistaken for stupidity.

 

I do not wish to have a replacement sent just wondering if I did anything wrong with tuning /oil mix. bevels looked good to me on this one. I know aftermarket is hit and miss. some good some not so good

 

No. That's a defective product.

 

It looks like the plating that was on the bevel chipped off the bevel and buggard everything.

 

I'm running 2 Cross 660 P+Cs, so far w/o any problems, but I don't have that many tanks through them.

However, i have done some milling, which is tough on saws. I was thinking after 7 or 8 tanks I was likely not to have problems, but I guess I could be wrong.

You should put "Cross" in the title, and I'd be interested to hear from those who have, and have not, experienced problems with these things.

 

Defective plating is easy to see here.
Glad I stuck with a used OEM cylinder on my build, even though I really wanted to try one of these.

 

I'm really starting to believe that all am jugs need port work in order to be usable. ...

But that's just me.

 

I'm really starting to believe that all am jugs need port work in order to be usable. ...

But that's just me.

 

I guess my question is, would beveling the ports prevent this, or is it a defect that the user can not address???

 

Looks like it chipped on the bevel first then the rest just flaked off. If one were to grind the plating off the inside of port and put a new bevel on it might of helped save it. But from the looks of it the plating would of flaked off there regardless. With any am cylinder I think it would be best to go over all the port bevels. Alot of folks aren't setup to do this unfortunately and just want a bolt on cylinder.

I am with mike on the quality of the cross cylinder. Mine looked very nice. All the ports had descent bevels and the plating had no flaws. After cutting the base on mine I took a diamond ball to the edge of base and it didn't chip or flake at all. Ive only got a couple tanks on mine but it still looks good through exhaust port. I'm going to tear it down shortly to make sone changed and check everything out.

 

I'll bet getting the plating correct around such angles as those bevels is trixy. ...then when the hone goes through there to do the final polishup....maybe just the very edge is too thin....and prone to breakage.

I'll bet this would have been fine if that bevel wasn't plated.

 

all AM parts are subpar in one way or another, so defective is the wrong word to use

plating comes off because it's to thin and not put on correctly. didn't bond because steps are skipped to save money

 

Agreed, there was no saving that cylinder

 

Thanks the bevels looked good on this one I did not do any extra work on it. Apart form that it performs rarely well for a after market. Back to OEM for me now. I'm glad I caught this before the big bang. And there is no damage.

 

ome? that a new brand?

 

Sorry me bad OEM/Stihl

 

Wouldn't matter. The plating is still defective. It should never just flake off like that.