What size is this piston? can some one tell me if its stock?

[BowerR64]

Is this a stock piston can you tell? Ive measured the bottom skurt of the piston with my calipers but im not sure what the stock size is suposed to be. I got the bike used and im not sure if anything had been done before i got it. The oil pump must of quit and i think i may need a rebuild 8-|

I think its a YFS blaster 200, is this about how big a 200 size piston is?

 

[stephen12091985]

stock is 66mm...........or post a pic

 

[meangreen]

If you could show a picture,that would be great.
Many of us on here can tell you if your bore is stock if you can show a pic,and tell you mic reading it may shed some insight into what you have going on.

 

[Liquid5soul]

Nothing you posted helped at all. How are we gonna give you input when we have to guess what kind of quad...make/model/year. and includding the measurment you took would help aswell as a picture.

 

[meangreen]

How exactly are you measuring that piston ?

 

[BowerR64]

Is this not how i should measure it? or measure the sleve?

 

[stephen12091985]

idk if thats how you measure it but if it is that deffinitly aint fittin in no blaster

 

[BowerR64]

idk if thats how you measure it but if it is that deffinitly aint fittin in no blaster

What do you mean? its not a metric set of calipers should i post a pic of the side of the sleve? im sure its a YFS200

 

[UniRacing]

looks stock to me bro..

 

[BowerR64]

I was started to second thought if i even had a blaster. Some one told me if it was bored any over it would be stamped on the sleve somewhere how much over it was. Is this a YFS sleve?

 

[UniRacing]

Yes and its stock piston,what year is it?

 

[BowerR64]

looks stock to me bro..

Thanks, how much over should i take it? or should i just wait and see what the machine shop thinks after they clean out the inside?

Ive never had to take one in to be fixed so im not sure if i just take it in and ask them to bore it over, or just true it up and then get a new piston kit to match what they had to take out to get all the trash out?

What would you guys sugest?

 

[UniRacing]

Well your piston looks pretty bad,and the rings are gone..

not sure what shape your sleeve is in i cant tell from the picturee,but...

If your sleeve isnt to bad they will just hone it out and replace your old piston with a wesico standard size,or if your sleeve looks bad...they will bore it out and hone it to the next size with is .20 i beleive..and then put a .20 wesico piston in

 

[meangreen]

Man that piston is FRIED !!! damnit man !!
Any how,your best bet is to let the machine shop decide how much to bore it-as unless you go with like a 240 sleeve no amount of thousandths of an inch are gunna really matter.

 

[UniRacing]

He coud just buy the 240 vitos kit

comes with everything for top end..

expensinve though,


just get a p&p job and new piston and rings

 

[stephen12091985]

why is the caliper between 80 and 90?

 

[BowerR64]

Im not going to have the shop do the work, i tore it down this far i can put it back together i just cant do the machine work i dont have the tools to hone it. The way the piston looks im sure the sleve is worn bad on the exaust side. I can see chunks of the piston melted into the inside of the sleve. I can also feel deep gouges into the sleve how deep they are im not sure.

What should i expect it to cost to just have the sleve honed out?

 

[Awk08]

that cylinder is gonna need bored, not just honed, if i wanted that back soon, i'd get a .20 piston and possibly the next size bigger too. take it to the shop. let them decide how far it has to go, and return the piston not used, that will save you some shipping time if the .20 isnt big enuf,
but imo, gonna need bored, how far ??? shop will have to tell ya

 

[super noober]

Im not going to have the shop do the work, i tore it down this far i can put it back together i just cant do the machine work i dont have the tools to hone it. The way the piston looks im sure the sleve is worn bad on the exaust side. I can see chunks of the piston melted into the inside of the sleve. I can also feel deep gouges into the sleve how deep they are im not sure.

What should i expect it to cost to just have the sleve honed out?

so there are no mistakes you are going to have to take the cylinder in and they will tell you what piston you are going to need, then youll order that size piston and when it comes in the mail take it back to the machine shop so they can bore it to that specific piston. they need the piston to properly bore the cylinder.

 

[MTN13]

What do you mean? its not a metric set of calipers should i post a pic of the side of the sleve? im sure its a YFS200

according to this picture, if im not mistaken, the bore of your cylinder is 2.686 in and that converted is 68mm which would mean it was bored .080 over, i may be wrong here on reading the calipers someone double check, but in that case it would not be stock.

EDIT: i just blew the pic up on my comp and its not 2.686 its 2.587 wich would make it stock sorry!!