Any of you guys see a problem with this?

http://www.motosport.com/dirtbike/PROX-PISTON-KIT-2STROKE

2nd time rebuilding a top end just wanted to know if i should stay away from this piston kit. I have 1 big question here tho what am i mesuring to figure out if my 06 still has stock bore. Do you just mesure the diameter of my cylinder?

I have not used a Pro X piston. But I would. I have heard not bad things about them

I have not used a Pro X piston. But I would. I have heard not bad things about them

Do u know about the measuring?

I have used Pro-x with good results, I believe they are actually OEM for Kawi.  Yes, measure the diameter of the bore, or the old piston.  A bike shop should have the tools to do it.  If there are numbers stamped on the top of the old piston, look them up on the web to see if you can match up what size it is.

I have used Pro-x with good results, I believe they are actually OEM for Kawi. Yes, measure the diameter of the bore, or the old piston. A bike shop should have the tools to do it. If there are numbers stamped on the top of the old piston, look them up on the web to see if you can match up what size it is.

Can i just measure with a digital dial caliper?

Measure the bore. Your piston will be worn. The service manual gives measurement specs.

Edited by Joshx221

Also OEMcycle.com has a cheaper price.

Also OEMcycle.com has a cheaper price.

Hey thanks man!

You can measure the piston and it will be close enough to tell you if you're a stock bore or not. The differences will be a full 1 or 2 mm from stock specs if it was bored.

 

Also, ProX is a very good kit. A friend of mine who builds alot of engines swears by ProX and of course OEM. I like Vertex, personally.

Edited by SAPPERS

You can measure the piston and it will be close enough to tell you if you're a stock bore or not. The differences will be a full 1 or 2 mm from stock specs if it was bored.

Also, ProX is a very good kit. A friend of mine who builds alot of engines swears by ProX and of course OEM. I like Vertex, personally.

Everyone goes by mm. Am i missin somethin or do u just convert from inches to mm

Measure the bore to be sure. I have seen PO that installed a stock piston into a 1 over bore jug. You just never know about used bikes. 

Can i just measure with a digital dial caliper?

If you have digital calipers then they have either metric or standard  push button for which ever you are measuring for. 

If you have digital calipers then they have either metric or standard push button for which ever you are measuring for.

O haha i dont have it in front of me so sorry. And about plating. Kawasakis cylinders are plated right? How do i know if i need a replate. The bike blew up at 60 hrs so it was pretty textbook

O haha i dont have it in front of me so sorry. And about plating. Kawasakis cylinders are plated right? How do i know if i need a replate. The bike blew up at 60 hrs so it was pretty textbook

Is it already off/...Post a good picture for us... but you can tell when plating is bad. You will see the duller colored aluminum where plating is worn off....usually starts around the exhaust and intake ports.

 

If you can still see crosshatch on the jug..it is in very good condition. 

Also if you are not sure it is still  plated or it has been steel sleeved....take a magnet and see if it sticks to the cylinder wall. 

Edited by Blackwoodz

Ok itll be a couple of days till i get it off. When i do and im insure ill post a pic thanks

BTW depending on hours ran and the condition of piston..I have reused them with just a new set of rings. More so the forged wiseco but some casts with low hours. Have you checked the bikes compression and is low....or is this preventative maintenance?

Um no i havent compression tested cause i dont have one but the bike wont run and i can kick the bike with my hand very fast im pretty sure the top ends blown up. It happened half way through a 3 hour ride. Alltho I did a finger comp. test and my finger made a popping sound so maybe i can do just rings?

I doubt it really doubt it then..... If it blew up/lost compression while running that means it heated up and stuck the rings into the piston. The piston will never be much good after that.

Also, NEVER just get rings for an unknown piston. The only way to buy rings is to:

1.  Buy a set the same time you buy the piston. That way you know you have the correct set.

or

2. You, yourself, know exactly what piston is in there.

Good to know. Ill atchualy take the jug off tonight so ill post pics and stuff

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