Please help! piston orientation

490Dave · Aug 21, 2008

I got a new wiseco piston kit for my KX450, the instructions simply say "arrow must point toward exaust side of cylinder"

This seems a little vague to me, do i install the piston with the arrow on the intake side of the engine pointing to the exaust side, or does the arrow point to the exaust side of the piston or what??? please help!

P.S. What ever happened to the arrow simply pointing to the front of the engine?

IndyMX · Aug 21, 2008

490Dave said:
I got a new wiseco piston kit for my KX450, the instructions simply say "arrow must point toward exaust side of cylinder"

This seems a little vague to me, do i install the piston with the arrow on the intake side of the engine pointing to the exaust side, or does the arrow point to the exaust side of the piston or what??? please help!

P.S. What ever happened to the arrow simply pointing to the front of the engine?

Seems pretty clear to me. Put the piston in the cylinder with the arrow pointing toward the exhaust port. Since the exhaust port is on the front of the engine, point it that way..

I don't know what you mean by "do i install the piston with the arrow on the intake side of the engine pointing to the exaust side" unless you have an arrow on the piston pointing toward the center of the piston, which I doubt.

Seems to me that you are trying to make this more difficult than it really is.

Rich Rohrich · Aug 21, 2008

Even without the arrow if you look at the piston crown and the valve cutouts, the orientation should be obvious.

490Dave · Aug 21, 2008

IndyMX said:
unless you have an arrow on the piston pointing toward the center of the piston, which I doubt.

The arrow does point toward the center of the piston! i guess thats whats hanging me up here.

"Even without the arrow if you look at the piston crown and the valve cutouts, the orientation should be obvious."

Sorry! its just not that clear to me that there's any difference!

Thanks for replying

IndyMX · Aug 21, 2008

490Dave said:
The arrow does point toward the center of the piston! i guess thats whats hanging me up here.

"Even without the arrow if you look at the piston crown and the valve cutouts, the orientation should be obvious."

Sorry! its just not that clear to me that there's any difference!

Thanks for replying

Post a picture.

490Dave · Aug 21, 2008

IndyMX said:
Post a picture.

I'll try

got it!
I've measured the valve reliefs and the intake side is only slightly larger than the exaust. My 47yr old eyes aren't what they used to be......... :(

I guess i just needed somebody to gently whack me on the head.

Thanks again!

Dylan19302 · Aug 21, 2008

If the arrow says to point forward point it forward.

490Dave · Aug 21, 2008

Dylan19302 said:
If the arrow says to point forward point it forward.

it doesn't say point forward......
im not dumb, i just wanted to make sure it was correct before i put it all back together!

thanks anyway!

Dylan19302 · Aug 21, 2008

is the bike a 2 or 4 stroke. if its 2 then there will be a solid side of the side of the piston and that side goes to the exhaust. And you said that the arrow points to the exhause so thats what i would do.

Rich Rohrich · Aug 21, 2008

Dylan19302 said:
so thats what i would do.

What you should do, is stop posting. :bang:

oldguy · Aug 21, 2008

Dylan19302 said:
is the bike a 2 or 4 stroke.

If you would take the time to read

490Dave said:
I got a new wiseco piston kit for my KX450, the instructions simply say "arrow must point toward exaust side of cylinder"

As Rich said maybe you should take up reading more and posting less

490Dave · Aug 27, 2008

Im happy to say the rebuild went fairly smooth (except for the whole piston thing) and have 2+ hours of track and trail on the bike and everything seems good. The only difference i can tell is there's a little more snap in the power on accelleration.
A couple of things to note:
1)besure to keep the rag stuffed into the case until you're ready to seat the head, make sure alignment pins stay put.
2)besure to snug the valve cover bolts all the way down or else the seal leaks
3)The front chain guide notch needs to go below the head gasket, it's difficult to keep it in place while setting the head, be patient and get some help.

Thanks!

Please help! piston orientation

490Dave

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