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Message started by Moarpower on 03/05/23 at 22:55:05

Title: 96.5mm Piston Ring Gap
Post by Moarpower on 03/05/23 at 22:55:05

Hi guys,

Finally putting my 86 back together with the new piston and cam.

I have a 96.5mm Wossner piston, but it has no info on the gap specs.
I was hoping someone could help me out with a safe ring gap spec as out of the box and in the bored cylinder, they are almost touching.

Also, what kind of ring compressor do you guys recommend for this. I have one from a car build but it not suitable for this situation

Title: Re: 96.5mm Piston Ring Gap
Post by Ruttly on 03/06/23 at 08:56:38

Look up , piston ring end gap chart , most are in inches.

Ring compressor , any one that fits , maybe borrow one !

Title: Re: 96.5mm Piston Ring Gap
Post by DragBikeMike on 03/07/23 at 00:00:03

I suggest you lean toward more is better. A big gap (within reason) will not be a problem, but too small a gap will wreck the engine. Top ring should be a bit tighter than the 2nd ring.

On a 97mm bore, .024" gap for the top ring and .028" gap for the 2nd ring works good for me.

Title: Re: 96.5mm Piston Ring Gap
Post by justin_o_guy2 on 03/07/23 at 09:26:58

Remember to break the edge on the corner. You don't even

have to be able to see it, just dress the corners that are against the wall.

Title: Re: 96.5mm Piston Ring Gap
Post by Moarpower on 03/08/23 at 00:02:10

Just a little fine sanding ?

Title: Re: 96.5mm Piston Ring Gap
Post by justin_o_guy2 on 03/08/23 at 11:49:47

You can watch a YouTube video on it. Just don't file the ring and get the gap,and stop. Gotta clean it up.

Title: Re: 96.5mm Piston Ring Gap
Post by Dave on 03/08/23 at 16:26:29

594640475A5D6C5C6C54464A01330 wrote:

You can watch a YouTube video on it. Just don't file the ring and get the gap,and stop. Gotta clean it up.

When you file a ring...you can create a sharp burr on the square edge touching the cylinder wall. A burr can scratch a nice gouge in the cylinder wall. The edge doesn't have to be rounded off - you just don't want a sharp pointy edge that will cut the cylinder wall.