Piston Slap Threshold?

[jrfastbanshee]

Ok...the last few trips out I noticed my left cylinder has a little piston slap. I re-ringed about 6 months ago and have about 140psi in each cylinder still. When I rev high and cut the throttle I can hear the piston "slapping" for a second or so. I know it's not good but I want to know if I can get a few more trips out of it? I just don't want to rebuild it till I get my coolhead...not sure why...just don't.

 

Has anyone ever broken a piston skirt? And is that from piston slap or something other? The bike runs perfect but I should know better. So once again here is the stupid question. Can I get a few more rides out of her without breaking the piston skirt?

 

Thanks...

JR

[Justintoxicated]

the only time I have heard serious piston slap is when I had a dome that was cut a little off and it was leaking coolant into the cylinder.. Any smoke or coolant issues?

[frocashmoney24]

yea ive broken a skirt before, and if ur worried about that happening dont ride it man, broke off, went into the top end, smashed the hell outta the head, the piston and the jug, ghtn went down into the bottom end and fucked my crank, not worth it, i had to go from a .40-.80 over bore, like cuttin my engine life in half, and drop 400 bucks on a hot crank n rods

[cgamla]

Same thing happened to me. I knew it weren't right but rode it anyways. Damn thing blew up when I was just coasting now I got two cylinders being sleeved and new set of pistons and a new crank . all to the tune of a thousand dollar bill. If I would have fixed it right away It would have cost me about 250 for a whole fresh top end. I'm an idiot.

[jrfastbanshee]

cgamla, that's when it makes the noise...just off full throttle and coasting. Guess that's all I needed to hear...new top end it is! It is just hard to do when it runs sooooo good after a year of replacing other crap. There is no smoke or coolant issues (anymore) I honed an re-reinged last time cuz coolant got in and scorched the cylinder walls. I guess it took a little too much clean up for the new rings. Oh well...it's just money right?

 

Anyone know what wiseco recommends for tolerance. Last two shops went .0025" and both ended up in cold seizures. I did the break in to a T both times...I think it was just too tight for the forged pistons.

Thanks all!