[NSRCA-discussion] 140DZ wristpin removal...help!

[Bob Wilson]

Hi Bob,
Hey, thanks a lot.  I'm going out now to give it a try.  I've got to warn
you though, there may be more questions:)

Thanks,
BW

On Sun, Jul 27, 2008 at 8:27 AM, Bob Kane <getterflash at yahoo.com> wrote:

>  Removing the wrist pin is a necessary part of disassembling a YS four
> stroke. There is a screw on the front of the engine in the center of the cam
> follower housing part of the block. Remove that screw, and you can insert a
> piece of wire to push the wrist pin out. It usually pushes out with little
> effort, but sometimes it is stubborn and you have to tap it out.  The wrist
> pin has to go back in the same orientation, the end that goes in first when
> reassembling the engine has a solid face, the other end has a hole in it.
> Also, that little screw has a clear plastic washer, don't loose it.
>
> When reassembling the engine, put the conrod on the crankshaft. Start the
> piston and ring in the liner from the bottom, and push it in a little so the
> wrist pin hole is exposed. Put the front teflon retainer in the piston, then
> slide the whole assembly into the block.  Position it so you can see the
> opening in the piston and conrod, then slide the wristpin in. Don't push too
> hard or you will push the teflon retainer out, and the liner will not push
> any further into the block. It might take a couple of tries, but it can be
> done.
>
> I assume you mean the piston ring. There is a second ring on crank shaft.
> If our plans include removing the crank to replace the main bearing, be
> careful, the crank ring is easy to break.  I know  ;)
>
> Bob Kane
> getterflash at yahoo.com
>
>
> ----- Original Message ----
> From: Bob Wilson <wilsorc at gmail.com>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Sunday, July 27, 2008 7:54:57 AM
> Subject: [NSRCA-discussion] 140DZ wristpin removal...help!
>
>  I'm trying to replace the ring on my YS 140DZ.
> No problem removing the head and back plate apparatus.
>  I was hoping that the piston and connecting rod could be removed without
> removing the wristpin...but that doesn't seem possible.
> I carefully removed the piston liner and removed the Teflon wristpin
> retainer through the (rubber stoppered) rear access hole.
> Now, how do I remove the wristpin?
>
> It seems that it should just slide out through the rear access hole.
>
> There is a front access hole through the cam gear housing that I assume is
> for using a punch to push the wristpin out the rear access hole...but I
> don't want to start banging around if this is incorrect.
>
> I know a lot of you guys have done this and would appreciate any help you
> could give me.
>
> Thanks,
> Bob Wilson
>
>
>
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