Originally Posted by VS_Rody

Hi Roelof,

Received the first batch of original OS R2103 and indeed a different sleeve and different crankshaft.
The changes are small but I think effective.

1) The crankshaft has a different timing(less open), this probably done to gain torque and fuelconsumption. A little extra work has been made behind the crankshaft counterweight(like I normally also do on my engines).

2) The liner has a slightly different shape on the exhaust. The central upper section is a little wider but the total exhaust area is the same as is the timing. Intake 7 ports.


I have some available Here for who is interested.

I have decided not to update immediately our VSR02 engine but first test this solution and have some specific engines ready for the Worlds.

Rody