1977 Benelli 750 SEI Fork Rebuild.
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Thread: 1977 Benelli 750 SEI Fork Rebuild.

  1. #1
    Member
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    John DeMaria
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    1977 Benelli 750 SEI Fork Rebuild.

    Thanks to a few contributors, I’ve identified my forks as the later, Series 2 style. They were manufactured by Moto Guzzi/ Benelli and used on several models. The earlier SEI’s used a Marzzochi Fork. Both styles can be found in the SEI parts listing, Series 2 is drawing 16A. The unique identifier is a “shock absorber” in the top half, above the internal spring. They look and feel very much like the door closer on a typical screen door!

    In the spares that came with my SEI, I have a complete set of front forks and a pair of NOS fork lowers, still in the bags. When opened, they had typical shelf wear, so I have cleaned, polished and repainted them. Pictures soon! I dismantled one of the spare forks. The chrome tubes look perfect, so will reuse them. I’ve ordered new shocks, seals, dust caps and some other bits, from MG Cycle (Guzzi Parts) and will confirm part numbers when I know they are correct!

    The plan is to build a fresh fork set, then replace the ones on my motorcycle. In the 500+ miles I put on the Benelli last Fall, it felt a bit “bouncy” up front. I suspect the shocks are shot? More to follow.

  2. #2
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    Here are the freshly painted, NOS lowers. Next task is making 4 X studs to fasten to them. They provide mounting points for the front fender.
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  3. #3
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    ..... made up 4 X new fender mounting studs by cutting off the ends of a nice set of bolts. Loctite and installed. Got some partsto clean, but now have to wait for the new parts from MGCycle. Back soon........
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  5. #4
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    Photo of one side, all cleaned up and waiting for new parts. Ordered shock absorber, seals, dust cap and sealing washers for bottom bolt (10mm washer with internal “0” ring). All from MG Cycle.
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    Last edited by leleven25#; 03-21-2019 at 07:05 AM.
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    Looking good!

  7. #6
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    John DeMaria
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    Sill waiting for parts, but the bike came with several kits. One set of seals is from Ariete (ARI.022). They have double springs, two wipers. The top spring recess was open, so I pressed it in first. I also have a set of Pyramid seals (FOS-012). They appear to have single oil seal, spring and top dust lip. They are more squared off at the top, so I used them for the second seal...... photo attached.
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    If you like to ride your bikes there are possibilities for enormous improvements in the forks for not a vast spend

  9. #8
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    Dansp1........ I went through the MGCycle website and saw all the options! Thought I bring these up to original standards and then build another set with all the spring/ shock/ and cap options. Any specific suggestions?

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  11. #10
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    Or more specifically this

    Vintage Street great leaps and bounds have been made in suspension technology, its a shame not to use it and it won't change the aesthetics

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