Can anyone tell me my piston size?

[2001Blaster]

I know stock's 66mm, but my piston has a set of numbers on it reading
(573M06700). Is this stock or 76mm? I need to know because my piston and cylinder look good so I just wanna get new rings and hone my cylinder and put it back together to last me through the holidays before doing a complete rebuild. Also the piston says C00L8 on it.

 

[Blaster200boy]

Product Search Engine For All Products - Wiseco Piston Inc.

to me it looks like 1mm overbore.
Hope this helped!

 

[fioz600r]

I think that number is the piston part number.

I dont think you could even fit a 76mm piston in a Blaster.

 

[TopTechKid27]

its a 67mm piston, the last 4 numbers on a wiseco piston (prefix 573) will tell you the size IE 6625= 66.25mm and so on hope that helps

 

[2001Blaster]

I think that number is the piston part number.

I dont think you could even fit a 76mm piston in a Blaster.

You're right, I meant 67mm. 72-72.5mm is a big bore.
So 67 it is huh? Thanks.

 

[fioz600r]

You're right, I meant 67mm. 72-72.5mm is a big bore.
So 67 it is huh? Thanks.

Then you were right it is a 67mm piston. I was going to ask you where you got 76mm from out of the number you showed but didnt want to sound like a dick LOL.

 

[2001Blaster]

My mistake. If it's a wiseco shouldn't it have the notches for the rings to be set? So that they don't move out of a 180* stagger? Mine doesn't... Anyway, know the size of my piston will save me time and money for now until I do a full rebuild, hell, if it holds up awhile I might just save and get a big bore piston and head set.

 

[fioz600r]

If you take care of it and change your rings ever 40 hours or so you shouldnt have to rebuild it that often.

 

[2001Blaster]

Thanks, it is a wiseco 67mm. Ok, so I know gaskets should only be used once, but if I put this back together with new rings and gaskets and it doesn't fix the compression would I be able to get away with using my new gaskets when I bore it out and get a 67.25mm piston? If it fixes it then I'll of course get new gaskets again the next time I pull my topend.

 

[wrench man]

If you take care of it and change your rings ever 40 hours or so you shouldnt have to rebuild it that often.

Really??, I got like 120hrs on my engine and have NO intention of changing the rings any time soon!

 

[yb200]

6 yrs on mine with the same rings still at 120 psi....has to have over 1000 hours on it

 

[stephen12091985]

6 yrs on mine with the same rings still at 120 psi....has to have over 1000 hours on it

i tihnk you have everyone beat on that

 

[nofxfan125]

If you take care of it and change your rings ever 40 hours or so you shouldnt have to rebuild it that often.

Damn, I'm wayyyyyyy too lazy for that! I'd rather just let it blow up and rebuild it every 2 years!

 

[2001Blaster]

Alright, so I got it running with new rings and gaskets. I honed the cylinder and got the compression up to 125psi. Do I have to break the new rings in? If so how?

 

[nofxfan125]

There's a sticky on the Engine page about how to break it in. You definitely need to do a break in to set the rings right.

 

[2001Blaster]

I only found a sh*tty sticky on breaking in rebuilds. I only changed my rings. Thanks for the help with that, but that sticky was so bad, it was just a bunch of different opinions. I think I'll do I light break in and wait for the full rebuild to see how well that holds up. Thanks again.

 

[darealblaster]

i tihnk you have everyone beat on that

nop, he is still competing with me, 6 years same top end still running at its best! havent changed rings,nothing.we have been the only owner of it, my dad bought it brand new.

 

[2001Blaster]

nop, he is still competing with me, 6 years same top end still running at its best! havent changed rings,nothing.we have been the only owner of it, my dad bought it brand new.

6 years is a long time for any piston, let alone a stock one. Why not put a lighter wiseco in it even if it doesn't need a new one? I guess if you baby it there's no point!