Cylinder wear

[Snedasawrus]

Evening

 

I’m about to replace the piston and cylinder on my 461. I have been given a used but original cylinder and I’ve ordered a meteor piston and rings. I’m just wondering if this is still in good enough condition to use? I hope these pictures are good enough to see. Also what gasket sealant would people recommend to use when fitting a new cylinder and exhaust gasket?

 

Thanks

[openspaceman]

It looks okay but hard to tell from pictures. When you run a finger around can you feel and scratches, a finger is sensitive enough to feel a ridge of half a thou.

 

Is that light colour by the on the head from running weak or just an ephemera of the flash?

 

When you get the new piston stick a new ring in the bore, keep it square with the piston and measure the gap at several places, if the change is a lot then the bore is worn.

 

I haven't come across worn, as opposed to ruined, nikasil bores but the plating is only 20thou thick. I am told concrete cutters often wear it through to the aluminium.

[peatff]

I use a wipe of Hylomar blue or equivalent on base gasket and nothing on exhaust gaskets. Can you feel the ridges above the exhaust port with the edge of your nail ? They don't look too bad try rubbing the cylinder with some 240 and WD.

Edited October 2, 2020 by peatff
spelting

[Snedasawrus]

Thanks for your advice. Yes the light at the top the the cylinder is the flash of the camera. There is a few very faint scratches on the sides of the low end. But not deep enough to feel with your nail . I will rub it down with 240 and Wd and measure with new rings like you said.