750 sei
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Thread: 750 sei

  1. #1
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    750 sei

    hello folks,

    newbie here, proud owner of a set of in line six cylinder bikes, cb*, z13*0, 900 sei - the cornetto model, and most recently an electric blue 750 sei which i am restoring back (close ) to its former glory.

    I'm dong the full rolling chassis before starting on the engine ( which runs very well and quietly , but for an unknown reason has very low oil pressure, especially at tickover ).

    Anyway, back to the rolling chassis, can anyone tell me size and quantity of the steering head ball bearings, top and bottom.....I tried to catch them all, but some made the break for freedom so I don't know the right quantities.
    Secondly, would be very grateful if a fellow owner could send me close up photo of both sides of the front wheel spindle area where it meets the wheel, inc speedo drive. I did not have the original wheels, but have collected and built a set but something isn't quite right in terms of spacers, etc so the pictures would help.

    I'm based in the North West, so if any fellow owners are near by , i can travel to take some notes! Thanks Loz

  2. #2
    Senior Member tucandugu's Avatar
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    Welcome Ita,

    I don´t know how much stering balls are there, but is suposed that all the circle must be filled with them, one beside each other, without any empty space.

    Here there is my Sei, I haven´t any close up image of the front wheel, but the image is quite detailed. Hope this can help you.

    Good luck and post some pics from your beauty.

    Carles

    Benelli TNT 1130 Sport EVO 2008 - Benelli 750 Sei 1977 - Moto Guzzi 65cc 1957 - Vespa Primavera 125 1977

  3. #3
    Benelli Wannabe ! ROBFM's Avatar
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    mmmmmm, Benelli Porn !


    and Welcome Ita01, post some photo's if you get chance







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  5. #4
    Senior Member GEORGES's Avatar
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    BENELLI MARTIN 900 SEI
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    Lovely sei, welcome

  6. #5
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    Steve Siggins
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    Beautiful. Just started my resto after tear down a few months ago.
    Engine is still stuck.....won't bloody budge !
    All frame/black components off to powder coat for sorting out. Want to get a good rolling chassis going before concentrating on the engine.
    P.S anyone stripped down the rear shocks for restoration before?
    Havn't really looked at them yet just wondered if there was any tips before I start....TIA

  7. #6
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    Chris's Techno Parlour
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    Hi,
    Sorry not to reply to your previous mail Loz and great to see you here. Use balls from a single batch - Brammer or Wyko sell them for pennies. Fill the races up until they are just too full then remove one ball. There should be a gap left (sorry to disagree with ya Carles) to stop the uncaged balls riding up each other. I'll count them this weekend I promise. Just say no - keep it blue!

    Chris
    Last edited by Tornadoboy; 11-25-2011 at 10:07 AM.

  8. #7
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    Chris's Techno Parlour
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    Orlando, dissembling the shocks can be a mystery. On the later ones there is a normally inaccesible position that allows the cams to pass straight through the preload adjusting ring. You have to compress the spring and rotate the adjusting ring so that the slot lines up and let the spring go. I think the earlier ones may have more conventional collets at the top. The plating is crap so it's worth trying to buff them up a bit. I've recovered two sad looking sets so far, most of the rust was just staining.

    Chris

  9. #8
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    Loz,
    I have done quite a few restorations and have always found it easier to have the motor done and then put the frame over the engine and build from there. This works really well for Lav Triples to save the frame from being scratched. I would imagine the Sei being the same.
    As for the engine, keep soaking the rings with penetrating fluid and gently tap regularly, presuming that is the problem.
    If you have a non standard front wheel it probably wouldn't help sending shots of my bike. The parts manual should give advice as to what goes where. I have a new Sei,so if there are any photos you might want later let me know then.
    Have you used powdercoating on a rebuild before?
    Ian

  10. #9
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    hi Ian,

    agree, frame over engine every time. I'll build the whole running gear, then dismantle to put engine in with a couple of strong asisstants. Powdercoating....yes, have use dit quite a few times. Would ereally appreciate picture of the front axle. speedo drive are etc....my wheels are "standard" but somethings not right.

    Where are you in the Uk ? it might help if I could have a look .

    cheers Loz

  11. #10
    Senior Member R Powell's Avatar
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    Richard Powell
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    I taped 25mm pipe lagging from Wickes to protect the frame from scratching when refitting my 900 sei engine. Once the engine is fitted it is easy to remove the lagging leaving the frame un scratched

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