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Hi, so here are some potential rookie questions. This is my first dirtbike (2000 yz125) and first top end on it, so here goes. I got a top end gasket kick and have two left over o-rings. I put the two in the head and the two in the expansion chamber intake. The two that are left are very similar to those in the expansion intake just a shade smaller OD. Do the have a home? Or are they in the kit for a different year then mine. Second question is... what the @$#@$ year is my bike. According to the vin its a 2000. According to the guy I bought it from its a 2001. According to the Clymer’s manual I have it has a coolant port on the front of the head and the power valve style of a 2001. I called a yamaha dealer and they said if the vin says 2000 its 2000 with a possible 2001 engine swapped in.. I asked if I could get the numbers off the engine and find out some info and he said no. So after my lifes story.. what ya got for me?

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I don't believe so. I had 2 paper square gaskets for around the PV side and front covers and one small one for the linkage arm. The ones I have left are much bigger. Maybe 1.75" OD.

SIDE NOTE: I read the OEM vs after market piston thread. I already had a Wisco to put so I went with it. Real cold day in the northeast and lots of piston slap for me.

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I don't believe so. I had 2 paper square gaskets for around the PV side and front covers and one small one for the linkage arm. The ones I have left are much bigger. Maybe 1.75" OD.

They go in the powervalve.

Look here. They go behind the circular part, in parts 14 and 15.

03yz125cylinder.jpg

SIDE NOTE: I read the OEM vs after market piston thread. I already had a Wisco to put so I went with it. Real cold day in the northeast and lots of piston slap for me.

Oh please.

I've run Wiseco pistons in all my 2-strokes, and I've never heard piston slap. Even when it was 30 degrees out.

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