MOPED ARMY

Good rule of thumb.

I would go .012-.014. Two strokes get that ring hot in extreme situations. Also you have two rings so why worrry about blowby, within reason

they do operate diffently.

they get pushed to the outside of the piston whenever they encounter pressure, makes for a very tight seal.

~SABAT!

another tip- use the piston to push the ring into the bore, it'll be level that way.

*formula

For a 2 ring set up the top ring should be 0.0035" to 0.0045" .

The lower ring gap needs be 0.002" bigger then the top ring.

Fast Bat out

I have a stupid dykes piston for Garelli with the exact same problem, it's just been sitting on my shelf because I didn't know exactly how to fix it.

Quatto

Use 800 wet dry sand paper .

Fold sand paper over a hack saw blade and sand away.

Fast Bat out

LoL

Mine came assembled in the kit. Not sure if Benji and Treatselves did that for me or Parmakit did it. But I'm not mixing them up now...

When the ring heats up it expands, though, and I don't want the ring ends pushing into each other and snagging a port.

and for there high performance single ring cylinders malossi publishes 0.15 mm of ring end gap and to 2 x 45 degree chamfers on the outboard edge of the gap. That is for a hard-chromium coated cast iron ring.

-naz

This is how you all are blowing pistons and kits, you keep fucking with the rings and shaving the pistons and doing other shit like that. Unless you know exactly what you are doing leave the rings be and just tune the carb well.

Yes Naz high performance chromium ring/s need taper at the ends to prevent the chromium from flaking off.

And single ring cylinders running over 10,000 RPM,s need more end gap 0.0045" to 0.0055" .

Single ring cylinders running over 11,500 RPM,s 0.006

Fast Bat out

Not what I meant, just saying that shaving your piston rings is a good way to end up with a blown kit. Running your ped with a badly tuned carb is another way to do the same thing. So, to avoid both leave the rings nice and snug and just tune your carb well. The rings are not made of a very soft metal, they do not expand all that much unless you do something way wrong. If that happens the ring will expand in all directions and will likely get stuck in the ring groove. Im sure you have seen the pics of that. The little pin in the ring groove will stop the ring from going to far length wise and it will expand outwards causing a ... soft seize. Do it a bit worse and it will seize up permanent like.