Piston install question

C

crusty1

Member

Oct 3, 2001

70

0

• Jun 27, 2004

• #1

Haven't done a top end for over 2 years and misplaced my manual. Which way does the piston face? One I have has no arrow on top. It's on my son's KX 85. Does the piston face forward with the two vertical pin holes and the oblong hole facing towards the carb? Which means the slots in the side marked with "in" go towards the back? Does this make sense? Is there a universal way to tell on all pistons regardless of mfg?
Also, how much play should there be side to side when you move the rod on the crank. There's just a little which doesn't seem excessive but thouight I'd ask anyway.
Thanks

 

Last edited: Jun 27, 2004

YZ165

YZabian

May 4, 2004

2,431

0

• Jun 27, 2004

• #2

If you could send me a pic (or post one) I could probably help.

 

C

crusty1

Member

Oct 3, 2001

70

0

• Jun 27, 2004

• Thread starter
• #3

Looks like forum administrator has disabled "img" so I don't know how I would get a picture to you. I've got two but can' t post them.

 

YZ165

YZabian

May 4, 2004

2,431

0

• Jun 27, 2004

• #4

mryance[at]hotmail.com

 

R

reelrazor

Member

Jun 22, 2004

340

0

• Jun 28, 2004

• #5

The ring locating pin is almost always on the intake side if that helps. Usually just off-center so that the ring end rides between intake port and transfer.

 

B

Bodge

~SPONSOR~

Oct 4, 2003

481

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• Jun 28, 2004

• #6

Wouldnt the vertical pin holes be to lube the exaust bridge?

 

W

wilb67

Member

Jun 28, 2004

1

0

• Jun 28, 2004

• #7

The side marked "IN" is the intake side.(carb side)
You will have side to side play on the connecting rod but should have no play up and down or twisting play.