Teflon Wrist Pin Buttons

MTC still sells them.  

Use whatever you prefer. either circlips or buttons will do the job as long as they are fitted and used correctly.
I've never had problems with either but prefer buttons for racing/frequent stripdowns and clips for long term road builds.
Re-using clips is not recommended as they get stressed and distorted on removal and re-use is the main reason they get an undeserved bad rap when one pops out.
For the sake of a couple of cents just buy new clips and save yourself a top end rebuild later on.
You should be able to get your buttons from Joe Hooper at Pitstop Performance if that's what you want but for the road I wouldn't bother unless the pistons have no provision for the clip like most MTC's.

First, only use buttons for pistons and pins designed for them! If your pistons didn't come with buttons (only) or buttons as an option, then use the correct clips intended to work with your pistons - ONLY!

I've got a new MTC 1395 for the bathtub GPz1100, and the "kit" uses MTC teflon buttons, as do all MTC pistons I have seen for the KZ and GS. As far as I know, they are reported to wear to an oval shape eventually when used on the street, but are preferred for racing. Greg Cope's tuning tips on APE's site suggest using aluminum buttons for street engines, and I assume you used to have that option when buying the ultra-lite Wiseco racing pistons (unfortunately out of production now). I think you would have to make these aluminum buttons yourself by machining a type of aluminum suitable for the job. I wish I knew what alloy would be best, but until I find out from a reputable source, I'm not risking my new big block engine to experiment, so teflon it is for now.....

I'm building another MTC 1395 for / with a buddy, and it is definitely a street engine that will get used hard and often, so I'll know more about any issues with teflon buttons soon enough!

Besides, if APE Jay says teflon buttons work, then I'll assume teflon buttons don't have any serious problems!

I have had total success with Teflon Buttons . Street / Strip / all good.
Never been a fan of circlips . Just a pain to use and cant reuse safely.
Some folks like Aluminum Buttons , but I dont . I have seen them fail in motors
usually due to heat / racing . Never seen a Teflon button cause a motor failure / meltdown
MTC pistons with Teflon buttons is my preferred setup
Hope this Helps
Dave

This is a 13yo thread...

GOOD INFO ANYWAY

SWest wrote: GOOD INFO ANYWAY

That it is

On a related note, make sure that your teflon pins are actually teflon. My only 2nd hand experience is with 'teflon' (PTFE) pins was when they turned out to be 'tivar' (UHMWPE). Do not use UHMWPE in an engine, it can't handle the heat - it's melting point is 130C compared to 327C for PTFE. They are sometimes confused because in most applications where a strong, high impact, low friction material is needed they both work well (UHMWPE is stronger than PTFE), but UHMWPE is generally cheaper.

Here's what happens when you use UHMWPE in an engine.

I missed it the first time around. Good info.
Interesting on the counterfeit teflon!

We generally only do aluminum buttons for fuel motors. Unlike teflon buttons that fit into the pin bores in the pistons, aluminum buttons have a stem the presses into the end of the pin. Essentially making pins with aluminum ends. Fast to install remove pins during engine service.