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Discussion Starter · #1 ·
Can anyone comment on why one bore might be preferable over the other for a 1996 M900?

I see most 900 owners go for the 41's...... just curious if the 39's are a waste of time on the 900 motor.

Premium Member
2,952 Posts
Nobody seems to report drivability issues using 41s over 39s, so go with the 41s.

That way, when something goes sour in your heads and you decide to send them off to MBP to be fixed up a little, you'll be all set to reap the benefits of improved flow ;)

Mark J
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