would you put this back together as is?

[ks9mm]

so my buddy decided to take his top end off to check how things are...other than reed's not closing completely (fixed by flipping petals) this looks ok to me..

would you put this all back together? or refresh with new piston/rings and perhaps cylinder refresh? it looks rough, but it's really just discoloration and cylinder walls are super smooth to touch. things were not all that dirty as well.

any thoughts?

thanks!!

 

[Motosportz]

looks good enough to run but not to expensive to pop a new one in while you have it apart either.

 

[Tinken]

Rings/ball hone.

 

[BadMotoWeazal]

please use new wrist pin clips****************************************!

 

[ks9mm]

Rings/ball hone.

do you mean hone by hand? problem with the rings is we really dont know what piston this is.. not sure if its original gas gas or not..can anyone identify it?

wrist bearings, wrist pin, clips all look like new.. I would think this was done recently (300 cylinder on EC250)

 

[Tinken]

We use a ball hone that goes on a drill with oil. If you already have it apart, rings are pretty easy, less of course you don't know which to replace them with.

 

[ks9mm]

it seems to be Wiseco piston..so Wiseco rings. What hone would you recomend for 300? 72mm bore

 

[Motosportz]

Never hone a plated cylinder.

 

[Motosportz]

The "W" on the piston casting might also mean Wossner but the side view with the pin does look very Wiseco ish. BTW makes sure as the wrong rings will end bad even if they seem to fit right. Seen that one before.

 

[Big Timmy]

Glad to see the reeds sealed up by flipping them over. The edges of the reed valve petals look like they are in good shape. i've flipped over quite a few myself over the years back in my 2 stroke days. I never had a problem doing it either.

It looks to be a "nicasil plated" bore you have there. (no sleeve) I wouldn't risk honing it with a ball hone but new rings are a good idea if it's apart. You could prep it for new rings properly by looking it up on the internet. I won't personally recommend how to do it. As there are many opinions and I don't want to start any long arguments that go on for days on here about that procedure. So look it up on the internet and see what the top cylinder rebuild service shops recommend that do bore replating and follow there recommendations for refitting a new set of rings.

 

[ks9mm]

here is the top of piston, any one knows what brand this is?

 

[Dirtdame]

Never hone a plated cylinder.

Never stone hone a plated cylinder. Ball hones are safe enough. I have used flex hones for years on all my plated cylinders.

 

[Motosportz]

ball hones are not needed and bad as well. They will chip the plating around the ports and start the peeling process. It is not needed. The plating us super hard and very thin. Just clean it real good with a super fine scratch pad and soap and thats all it needs.

 

[BadMotoWeazal]

use new cer clips, I don't care how good the others look.... Please don't ask me how I know, it makes my wallet hurt every time I think about it.

 

[Big Timmy]

I agree that a ball hone can damage the area around the ports and make low spots and chips in these critical areas, Do yourself a favor and look at the websites. These websites are very informative and are more than happy to show you just what exactly can happen and what kind of work they have to perform after people did their nicasil cylinder wall in with the improper use of a hone. It won't cost you anything to look at these websites. Or you can take your chances.

A very light cross hatch is all your going to need more than likely and a super good cleaning after. If there are any vertical streaks or spalling left from the piston. Which doesn't appear to be the case at all . Look at how to do it properly on the cylinder service websites. It's not rocket science but there are do's and don'ts, you will be ahead in the end. Again use new replacment hardware such as the clips, they are a one time use item.