A friend gave me an OS .60 FP a while back, and last night I was looking inside the cyl. w/a flashlight and noticed some blue discoloration spots in the cyl...So, I took the head off for a better look, and sure enuf, there are bluish "blotches" in and around the top lip of the cylinder...This engine is several years old (he can't remember exactly,he's 85 and can't fly "gassers" any more, I'm re-teaching him w/a park flyer tho...) Could be this one is from the "bad batch" of peelers I've heard so much about??? Is there a way I can recognize it before things get nasty and chew things up? Is the blue nickel area(s) gonna peel? I don't want to run it any more, cuz it's almost brand new (2 tanks @ a rich 2 cycle setting) Thanks...

Proptop, Blue usually means heat. Peeling will uncover the brass lining and will look shinny and with a gold color. It will also have a raised area around the peeling that you can feel with your finger. Careful, it can cut that finger too!
Suptter

Hi!
Blueish! The Nicasil liner in all OS engines is a little blueish in colour.......that's perfectly normal.
If the nickel has peeled away the brass underneath is yellow and not blue....
Over here in Europe (Sweden) I don't think anyone has heard of any OS engine peeling nickel from a cylinderliner or heard this happen to any other ABC or AAC neither!! I have definitly not.. and I have been into this hobby/sport for more than 27 years.

Regards!

Jan K
Sweden

Suptter and jaka, thanks for the speedy replys...I guess it's the "blotchy" spots of blue (not a uniform color) that concerns me. I've been doing this since the early 70's, but have never encountered this sort of thing...I am familiar w/ the bluing of motorcycle exh. pipes due to heat, but this is the first time I've seen it INSIDE a cylinder...There's no brass exposed, and I know it's never been run lean, because I'm the only one who's run it...I guess maybe I'm just a little paranoid after hearing+reading about the other occurances of peeling...I might as well use it, and if something happens, then I'll take care of it, after all, it ain't doing me any good just sitting around, aye? Thanks gentlemen, I'm not gonna worry about it, I'm gonna use it and enjoy it...Tom.

I haven't kept up on the whole peeling problem, but I thought I remembered it only being the FX series, not the FP's.

I'm with you..run it!

Jaka;
My OS 25LA peeled. Now you've heard of one