wiseco or stock...how can i know

kevfort19 · Post by **kevfort19** » 12:32 am Jan 04 2010

how can i know if it'S a wiseco piston or a kawi piston in my bike... at the moment the cylinder is off. I want to know if i have to change the piston ( if it'S a grenade) or if i just have to put some new rings.

Post by **Julien D** » 07:28 am Jan 04 2010

Well, how does the piston look? Is it beat? You might need to replace it anyway since you have the top end apart. If it is a wiseco, it will have a number stamped on top.

kevfort19 · Post by **kevfort19** » 09:05 am Jan 04 2010

it looks good i will take picture.. i don't know how to know if it is good or not. i just know that i have to measure it.

Post by **Julien D** » 11:04 am Jan 04 2010

It's pretty hard for a piston to be worn below spec without SOME sort of wear marks. You would be seeing evidence of blow by below the rings and such as well. Since you have it apart I would at least install new rings.

Clean the top of the piston and look for the part # stamped in there.

kevfort19 · Post by **kevfort19** » 11:11 am Jan 04 2010

dac i will do this , this week thanks a lot.

canyncarvr · Post by **canyncarvr** » 11:38 am Jan 04 2010

This question has been asked before..I've asked at least twice: 'How do they look different?'

SOME 220 rider out there has a picture of a Wiseco next to a Pro-X. Let's see it! NOS Wisecos that come off ebay..and 'new' ones, too.

Surely there is something enough different between the two that could be determined from a look in the exhaust port or intake.

juliend: Wiseco's DO have a PN on the piston crown? I've seen some that do..don't know if that means all of them do. Pro-Xs don't. At least not the 200 Pro-X pistons I've used.

It would be nice to have a definitive answer for telling the difference between the two. It's certainly come up quite a few times.

bronco95tgp · Post by **bronco95tgp** » 12:09 pm Jan 04 2010

I will have pictures of a stock 220 piston next to a Wiseco in a couple days

canyncarvr · Post by **canyncarvr** » 12:40 pm Jan 04 2010

Great!

Post by **Julien D** » 12:51 pm Jan 04 2010

Every wiseco that I've seen, regardless of make, has a PN stamped on top of the piston crown. Also, there is a W inside the piston somewhere about the wrist pin area.. I can not think of anything that would give it away by looking through the exhaust port. As you said, we'd need more side by side shots. I will get some side by sides of my "nos" wiseco and my OEM pro-x as soon as my stuff gets back from langcourt.

kevfort19 · Post by **kevfort19** » 01:14 pm Jan 04 2010

good!:)

bronco95tgp · Post by **bronco95tgp** » 04:29 pm Jan 04 2010

Here is a new wiseco for an '04 22O.. I don't have the stock one out yet. I am the original owner and know for sure that piston hasn't been touched.

canyncarvr · Post by **canyncarvr** » 04:35 pm Jan 04 2010

What's the intake skirt look like? I see part of it in the middle pic...

What are the two numbers? The long one is the PN? ...or the shorter.

..maybe a pic of the underside? I'd like to see what they use for pin oiling holes.

I'm quite sure the Pro-X has 'indents' or cut-a-ways at the pin boss. Couldn't see that with the piston in the cylinder, though.

Thanks!

bronco95tgp · Post by **bronco95tgp** » 04:38 pm Jan 04 2010

juliend wrote: Also, there is a W inside the piston somewhere about the wrist pin area..

I do not see a 'W' inside the new piston santa brought me in a Wiseco box

bronco95tgp · Post by **bronco95tgp** » 04:43 pm Jan 04 2010

canyncarvr · Post by **canyncarvr** » 04:47 pm Jan 04 2010

Thanks!

bronco95tgp · Post by **bronco95tgp** » 04:56 pm Jan 04 2010

sorry the camera sucks and has no flash.

Its the M Series piston
the two numbers are:

750M06900 in the middle is the part number on the box

6315J out the outer number

canyncarvr · Post by **canyncarvr** » 05:03 pm Jan 04 2010

The longer number is the PN. The shorter? I dunno. Google doesn't say (in regard to Wiseco pistons anyway).

Maybe it's a batch number or sumthin'.

I've not seen different 'series' of Wiseco's pistons for the KDX. Is an 'M' different from some other type?

bronco95tgp · Post by **bronco95tgp** » 05:14 pm Jan 04 2010

The included directions say the piston to cylinder clearance must be 0.0025(0.064mm)

The directions also say if the cylinder has an exhaust bridge, the piston should contain lubrication holes on the skirt where it contacts the exhaust bridge. If the piston does not have the lubrication holes on the skirt, they must be drilled.

canyncarvr · Post by **canyncarvr** » 05:26 pm Jan 04 2010

Read that exhaust bridge note on the web.

That clearance is a minimum I'm sure.

I've never seen a clearance that close on a Pro-X. They have run around .005", even on a newly plated cylinder.

The point being the age-old cast vs: forged thing. A forged piston has a 'grain' to the metal, and so expands more than a cast piston does. GENerally...put a forged piston in a cylinder that has been machined/designed/honed to fit a CAST piston...and it's gonna stick.

Post by **Mr. Wibbens** » 05:27 pm Jan 04 2010

Here's where the dubya is located

KDXRIDER.NET

KDXRIDER.NET

wiseco or stock...how can i know

wiseco or stock...how can i know