Recent content by Skippa

It seems amateur mechanics got out the forum :D IMHO if no marks are present, it means there's no a specific way up as the ring shape should be simmetric. If the shape is not simmetric, way up should be indicated with a letter printed. More in general, i think that today any item industrially...

Ciao everybody, at the end, I bought a Vertex replica 66.35. Compared to the old S3, it is more oval as on the bottom I found effectively 66.35 while under the pin hole is 66.25? old piston is definetively more round but about 66.27 ad most (bottom area). I watched some videos where it was...

Hi again, I repeated the measures a tons of time at my home, where temperature is pretty standard conditions (circa 20?C). Result is always the same: Cylinder 66,35 Piston 66,27 Delta = clearance = 0,08 mm Piston an S3 Vertex, cast. Cylinder as well piston appear in a good shape at my poor of...

I'm not a god of knowledge, as you already got :D, but I guess a ring change only is not needed on our engines unless after inspection and cleaning you find piston and cylinder ok, but worn/damaged rings (I think rarely). Really I think that when you open the top end, it's the time for service...

Hei guys, thanks for your replies. End of the week I'll repeat measures in a warmer place and I'll take some pics of the piston so that you may post your thoughts about replace... I already bought the clutch discs being convinced mine were worn, but I later knew there's a mistake on the manual...

I add another info: my garage was quite cold when I measured. I suppose that nominal measures are taken in standard conditions, something nearby 20?C while when I measured, ambient was at approximately 7-8 degrees less, maybe lower too. Thermal expansion of alluminum seems comparable with the...

Ciao everybody, I'm Luca from Italy and I ride an EC 250 my 2005. I joint the forum as I've read lot of interesting and useful info. Thanks to administration and to you all to share. Despite several threads here on the forum about this topic, I didn't find an answer, so I try to ask you help...