Benelli sei 1978 - Project underway - Page 2
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Thread: Benelli sei 1978 - Project underway

  1. #11
    Member
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    Mark Hollingsworth
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    Nov 2008
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    Found a couple of interesting things on the sei.

    1. Someone appears to have welded on another damper mount on the swingarm. Just over the axle. But they are both in the original position now. It has period Marzocchi with those gas ‘canisters’ on the side.

    2. I think original European headlamp (Aprilia)- unfortunately the reflector seems to be a bit worse for wear.

    3. Engine turns over very nicely with sparking plugs out- I need to do a compression test also.

    4. Someone bypassed the fusebox (and removed it)- also some other strange wiring. Oh well.

    Might try to give it a spin up with the starter motor before too long. But will change oil first. No idea how long it has been sitting, but I think since the 90’s perhaps.

    I pulled off the quarter fairing- looks to be an ABS type setup- maybe one of the ‘Dicks Cycle’ ones?
    Tomeselli clip-ons. Anyone looking for a pair? (I’m going back to stock).

    always interesting getting into a new bike.

    Mark
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

  2. #12
    Senior Member
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    Cam Douglas
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    Quote Originally Posted by Lotus54 View Post
    It has period Marzocchi with those gas ‘canisters’ on the side.
    Marzocchi Strada. Probably an OK shock in back the day (late 70s), but pretty crap compared to more modern stuff. You can get very good 'classic look' shocks with adjustable damping these days.

    Those old Marzcchi Stradas are fully rebuildable and all the parts are readily available. So they are worth something to people wanting to restore bikes that were originally fitted with them. If you replace them, put them on ebay. Someone restoring a bevel Ducati will give you good money for them.

  3. #13
    Member
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    Mark Hollingsworth
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    Yes, I was planning on replacing those with something modern. Not sure what yet, any suggestions?
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

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  5. #14
    Member
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    Mark Hollingsworth
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    8276
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    Update:
    I have been checking some wiring- checking compression, deciding on what needs to be done.
    I replaced the ignition switch (no key) and cleaned up some contacts, put a few jumpers in...
    the engine cranks over on the starter, had great spark and loads of really poor connections. (Likely building a new wiring harness, if I can find good wire).
    Compression on #1 is low, oil in the cylinder brought it right up. Possibly stuck, worn or broken rings.
    No idea is ‘smooth top’ or ‘pop up’ pistons, or A/B size.
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

  6. #15
    Member
    Name
    Mark Hollingsworth
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    8276
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    Nov 2008
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    Port Angeles, WA USA
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    Popped the engine out today. Tried using my cherry picker with an engine ‘leveler’ to get the rear raised properly.
    Worked a treat.
    I had to take it off the lift, since I couldn’t get the legs under the lift. But this worked quite well.

    Benelli sei  1978 - Project underway-0dd94b0b-4f04-4e05-bae3-f727359dec6f.jpegBenelli sei  1978 - Project underway-33d2e32b-4027-4713-85fc-bf8b3e8a3696.jpeg
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

  7. #16
    Member
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    Mark Hollingsworth
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    8276
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    Port Angeles, WA USA
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    Head came off easily. I wasn’t to sure about the cylinder. It took my awhile, warming it up, gentle tapping etc. but once it started to rock I knew I had it.

    #6 piston (Manual says #1 is left, although the handmade labels were opposite) had two stuck rings, just like I thought. A little bit of rust on that cylinder, but light enough I think it will hone out well.

    Now I have to figure out how to remove the alternator rotor. Manual says to use a pin in the tool kit. Yeah, like that is still with the bike..
    anyone know the size of that pin?

    Benelli sei  1978 - Project underway-34a5c69f-e5b4-42e1-afa9-f29215826e0e.jpegBenelli sei  1978 - Project underway-933b8c49-bcd6-44fd-a18a-be76be973a4d.jpeg
    R Powell likes this.
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

  8. #17
    Member
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    John DeMaria
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    Nov 2017
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    Canada
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    Nice work Mark! Did th fenders arrive safely? John D.

  9. #18
    Member
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    Mark Hollingsworth
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    Quote Originally Posted by leleven25# View Post
    Nice work Mark! Did th fenders arrive safely? John D.
    Yes! Sorry, forgot to write back. At first I thought the package was damaged, but then realized it was just creative packaging (worked great).
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

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