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Thread: Front cylinder head change from a Monster

  1. #1
    Join Date
    Jun 2018
    Location
    Preston
    Posts
    6

    Default Front cylinder head change from a Monster

    Morning,
    Asking for help for a friend who lives in the Czech republic. Unfortunately his original 900ss developed a main bearing problem and was scrap. He purchased a replacement engine from Italy but did not realise that it was from a Monster with no drive on the front head for the tacho.
    He still has the head from the original engine and is wondering how difficult it is to swap the two over so he can have a working rev counter.
    Secondly are there any extra parts he will need to purchase before attempting this.

    Any help appreciated.

    Mick

  2. #2
    Join Date
    Aug 2007
    Location
    Minneapolis, MN, USA
    Posts
    430

    Default

    Direct swap. He would probably want to do this anyway as many of the M900 heads had 750 sized valves and cams. He should swap the front and rear heads so they match.

    There are a few O-rings between the heads and cylinders I would recommend replacing during the change over

    Hope that helps
    Reed H

  3. #3
    Join Date
    Aug 2008
    Location
    Calne UK
    Posts
    1,290

    Default

    Unless marked with V1, then they have the bigger valves.
    celeresracing.blogspot looking-back-at-2016-classic-tt
    Power tends to corrupt and absolute power corrupts absolutely.

  4. #4
    Join Date
    Aug 2017
    Location
    Stockbridge Hants
    Posts
    11

    Default

    Quote Originally Posted by stafford View Post
    Unless marked with V1, then they have the bigger valves.
    It’s the V2 heads you want from a M900 for big valves with the hardened valve seats. V1 are older than Monsters (Pre ‘93) and have the big valves but softer valve seats.

    V2 were fitted as standard on M900 from ‘93 till ‘96/‘97 then came back with the M900S and Sie.

    The 900SS stayed with V2 heads.

    The 750 style heads are marked with a W on the casting and do effect the power output.
    http://bradthebikeboy.blogspot.com/2...s-v-heads.html
    Last edited by Darkness; 08-03-2018 at 08:25 AM.

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