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-   -   which underhead for sirio BK EVO2 & EVO4 (https://www.rctech.net/forum/nitro-off-road/388752-underhead-sirio-bk-evo2-evo4.html)

Martin.S 04-12-2010 04:16 PM

which underhead for sirio BK EVO2 & EVO4
 
Hello!

My sirio BK EVO2 blew last summer and messed up the underhead, i am now ordering a new one but i'm confused. There is one called: S21 023200, that seems to be the turbo head i'm looking for. But then theres a "S21 023201 S.S" (S.S for "short-stroke"). which one is it?

And then, a friend of mine wonder if he has the same head as me in he's evo4.

/Martin

ScottyM 04-12-2010 06:26 PM


Originally Posted by Martin.S (Post 7263546)
Hello!

My sirio BK EVO2 blew last summer and messed up the underhead, i am now ordering a new one but i'm confused. There is one called: S21 023200, that seems to be the turbo head i'm looking for. But then theres a "S21 023201 S.S" (S.S for "short-stroke"). which one is it?

And then, a friend of mine wonder if he has the same head as me in he's evo4.

/Martin

If the bore diameter is the same in the EVO2 and EVO4 then the head button from either will work..

TopGearRC 04-12-2010 07:41 PM

The timing of the crank are the only thing different between evo2,3 and 4 other dimensions are all the same, since all the parts are interchangeable. I'll take apart my evo2 and evo3 and measure them to confirm.

Martin.S 04-14-2010 10:27 AM

Great! thanks for the help!

/Martin


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