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Old 04-12-2010, 04:16 PM   #1
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Default 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
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Old 04-12-2010, 06:26 PM   #2
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Quote:
Originally Posted by Martin.S View Post
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..
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Old 04-12-2010, 07:41 PM   #3
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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.
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Old 04-14-2010, 10:27 AM   #4
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Great! thanks for the help!

/Martin
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