MOPED ARMY

Your intake port should be exposed when you are at TDC. If not all the way exposed, then... well, hmm, I suppose you might trim it so it is fully exposed. The transfers should be completely closed at TDC, as well as exhaust. At BDC, the transfers and exhaust should be fully open.

Somebody who plays with A35 cylinders will know exactly what the port timing opportunities there are in there...

pic 2

pic 4

I put the piston in the cyl at prob 2mm BTDC, for TDC imagine a little further out. You'll see how far in the next pic.

You can clearly see a large portion the intake is covered up.

This is how deep the piston is in the previous pic.

This is the piston pushed out super far so you can see the rest of the intake port

This is how far the piston is pushed out this time

Mick, the transfer are definately completely OPEN at TDC with the exhaust completely closed.

So I guess what I'm asking is, is there any downside to cuting the upper piston skirt to where the intake is completely open.

The A35 has boost ports in the piston already and this is a reedvalve. Ideas?

new rings and a hone dude.

porting is fine. if you want to open it up go wider on the intake and exhaust, and a little taller on exhaust.

Unless someone stuffed a Puch piston in there the two slots cut in the piston skirt facing the intake are open a long time before the bottom of the skirt uncovers the intake port. If you have no holes in your piston skirt you can make some.

I just got the bike. It was a targa owned by a kid, who obviously let the oil injection run out at some point.

When I took it off I was really surprised that the cylinder was in such bad shape because the bike ran great and got to 35 fast with great pickup.

News rings come in the mail this week, was already planning on the 400 grit wet sand.

I took the hump out of the exhaust outlet, which removed A LOT of material without even altering the exhuast port window.

I'm going to use polini reeds, daelim intake, bigger carb, bi turbo. I hope to hit 45mph out the box.