Going to install this polini, but those wrist pins are a tight fit. Seeing as how I've broken stock pistons in the past from not having the right tool, just wanted to ask if anyone had one of those nifty clamps that holds your piston on one side with the strap and screws the wrist pin in on the other side.
You let me borrow your tool and I'll buy you a six pack and maybe leave something with you as collateral, so you know I'll return it.
e-mail me if you can help, thanks!
they're only tight dry. dip the wrist pin in 2stroke and it should slide right in.
Yeah, lube that whole thing up, even more than you think necessary.
I always used a hand socket driver, 1/4 inch, with out a socket on it.
The square head fit perfect and didn't risk anything like a sharp flat head or phillips might.
yeah, actually I tried it on the polini piston, and it slides right out with a sharpie--- which was the first thing I grabbed that was the right size.... but lemme tell you, the stock one I put in last summer, was waaaay harder.
use some lube and an 8mm socket.
I usually use a wooden dowel and keep some just sitting around for just such a purpose. It's fun trying to press them in on engines that use pressed wrist pins. :-)
-naz
yeah, I used a pencil to align the new piston. getting that one on was easy.
getting the old one out was a total bitch. I had to stuff something in there to keep the crank from moving side to side, then basically use the socket driver and a rubber mallet for a while, then use a huge C-clamp to drive it the rest of the way. I'd never want to do it again without making the right tool.
In the figure I'm gonna cut up some old jeans to make the part that wraps around the piston, and then modify some other clamp for the rest, hammering on it like I was doing would damage the crank if I did it enough times.
10mm craftsman socket and a little thumb love should do it. You can also get a bolt that will pass through the pin make sure the head clears the piston in the side and then get some washers and a nut. Twist gently and this should loosen it so it slides out. Email me for a pic if you dont get it
makes sense, Bolt>washer>socket>piston, on the other side the head of the bolt. The washer is there against the socket so the nut continues to tighten and the socket just pushes against the piston while the head of the bolt pulls out the wrist pin, great idea.... wish I had thought of it last summer when I was breaking pistons and cursing :)
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