Originally posted by afm
Hi guys, for your records below is the official answer I got from the factory concerning conrod life for the Sirio S12. Also I did measurement to crank pin on a new stock engine and found that it has 4.428mm.
Hope it helps everybody
AFM
"The right play between crank pin and conrod bushing is 0,04 - 0,05 mm. I don't know if you're able to check it, but I suggest you change the conrod every 2-3 hours running.
The life of the conrod depends mainly on the fuel you use, as the lubrification and the right carburation keeps your engine running well for long time."
Regards,
ANDREA ROSSI
Lavorazioni Meccaniche srl
Via Meucci, 3 Seggiano di Pioltello Mi Italy
Tel +39 0292160235 Fax +39 0292160581
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WWW.STAR-MOTOR.COM
I have seen here in Venezuela, from the experience of the local distributor, that the first batch of Sirio where excellent (piston/sleeve, conrod) but the new batch, i think that they call Evo2, is not the same. Main issue is the conrod. In most of the cases have a lot of play after 30 minutes of use and in some case even brokes. I see that this guys are using the same fuel, by the way, mixed by themselves and so sure that there is enough fuel, and before they did not have any problems. On the other hand, the factory claim that there is no problem at all with the materials. Seems to me that something has changed in the material or is just a "defective" conrod batch
Just my 2 cents
Paolo