Benelli Mojave 260 - cylinder head gasket
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Thread: Benelli Mojave 260 - cylinder head gasket

  1. #1
    Junior Member
    Name
    Maurice Donini
    Member #
    19421
    Join Date
    Jul 2019
    Location
    Connecticut
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    Benelli Mojave 260 - cylinder head gasket

    Hi,

    The cylinder head gasket on my Benelli Mojave 260 failed.

    To replace is it as 'simple' as removing the head, replacing gasket and reinstalling the head?

    Do I have to worry about top dead center?

    Any help is appreciated.

    Thank you

    Maurice

  2. #2
    Senior Member
    Name
    Cam Douglas
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    18563
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    Jul 2018
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    Tasmania
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    264
    Hi Maurice,

    Sounds like you might be a novice at removing cylinder heads. That's OK. We all have to start somewhere. This is a good engine to start with.

    It's a single cylinder pushrod engine. You won't be disturbing the camshaft timing so you can remove the head with the crankshaft in any position.

    However, I'd suggest that you put the piston as close to TDC as you can before you start, simply to stop any debris falling into the cylinder. Before fitting the new gasket, you'll have to scrape the gasket mating faces clear of any old bits of busted gasket, carbon, dirt etc. which can drop into the cylinder. It's a lot easier to retrieve any crap if the piston is at the top of the bore. A nozzle on a vacuum cleaner hose will get rid of any small bits before you put the head back on.

    I'm not familiar with the 20 Mojave engine in detail, but looking at photos, it appears that the head and cylinder are both held on by head studs that go down into the crankcase. In that case, the cylinder will be free to lift up when you remove the head stud nuts. But try not to lift or jiggle the cylinder as you remove the head. If that does happen, chances are you can re-seat the cylinder and get away with it. But if the base gasket tears, and any pieces of gasket are displaced, you'll have to lift the cylinder right off and replace the base gasket too. It's all do-able, but you're better off not disturbing the piston rings if you don't have to.

    Good luck, and let us know how you get on.

    Cheers,
    Cam

  3. #3
    Junior Member
    Name
    Maurice Donini
    Member #
    19421
    Join Date
    Jul 2019
    Location
    Connecticut
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    4
    Hi Cam

    This helps.

    Thank you

    Maurice

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  5. #4
    Junior Member
    Name
    Maurice Donini
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    19421
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    Jul 2019
    Location
    Connecticut
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    Hi

    Okay other projects have gotten in the way.

    Next question- does the engine need to come out?

    Looks like the top of the frame is in the way.

    Thank you

  6. #5
    Junior Member
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    14167
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    Nov 2015
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    Massachusetts, USA
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    Maurice,

    You're in Conn? I'm in Mass. Take a look at this group, which is dedicated to the Wards Riverside Benellis like the Mojave.
    There's people there who have done this before.

    Joe


    https://groups.io/g/Wards-Riverside-Cycles

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