Bunch of Assos!

[Grant]

There seems to be a few Assos on this forum, so I thought I would join them!  8)

The Mirage barrels went away on holiday for a rebore and came back with nice and shiny new pistons.
These are high comps as my source only had high comps in first oversize (80.4mm)

Before fitting them I weighed one vs the standard piston.
This was with rings fitted but no gudgeon pin or circlips.
Standard weighed 317g and the high comp weighed 354g. Maybe this is because the piston is larger diameter and has a dome on the crown.

The new one has a shorter skirt (which has a high slip coating) and I noticed the top ring land is deeper down the piston so less likely to burn out the top edge at the valve cutaway. I have seen 1200 high comps where this has happened as whichever make and design it was had the top ring groove too near the top of the piston.

 

[redax5]

bit heavy those Asso's, all that extra weight slapping about, used a set years ago but not used them since for that reason
nice piston apart from that


our hi comp Ross pistons in 80.5mm size weigh in at 267 grams bare plus 23 grams for rings for total of 290 grams
gain this light weight by ordering internal profile machining when I buy my pistons from them, minor cost

 

[dja981]

Think the Asso gudgeon pins are shorter and have a bigger internal diameter compared to standard ones so probably a bit lighter.

                                                                          Dave

 

[MarnixSFC]

Forged Assos ain't cheap, but they are simply the best pistons available for Laverda twins and triples.

Marnix