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  1. Replies
    13
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    2,112

    I do recall speaking to someone quite a few years...

    I do recall speaking to someone quite a few years ago who successfully fitted Kawasaki gpz305 pistons to a 900 Sei. I looked up the bore X stroke which is 61 mm 52.4 - it's also a two valve sohc...
  2. Replies
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    2,112

    I fitted Yoshimura CB 550 pistons in my Sei...

    I fitted Yoshimura CB 550 pistons in my Sei decades ago. It wasn't too onerous as I remember, and the same can be done to a 504. I think just the gudgeon pins needed tweaking and a one off copper...
  3. Thread: Benelli 354

    by Cosmo
    Replies
    9
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    565

    That'd be it. I used to run mine with K&N's. The...

    That'd be it. I used to run mine with K&N's. The jetting went up a VAST amount. Put the airbox back on and I'm sure that will sort it. That said, there's a few more ponies in there to be had if you...
  4. Thread: Benelli 354

    by Cosmo
    Replies
    9
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    565

    It sounds as if it's really running lean. The...

    It sounds as if it's really running lean.
    The obvious thing is to check the float heights are correct and the tabs haven't been bent whilst mucking about with the float bowls and main jets, then...
  5. Replies
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    325

    The Benelli 4's are rather different from the...

    The Benelli 4's are rather different from the otherwise very similar Honda 500/550's systems. The Benellis have sprung carbon brush pick ups off the rotor, so go back to basics. Check those first and...
  6. Thread: gas tank

    by Cosmo
    Replies
    2
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    316

    The varnish petrol residue is HORRIBLE to remove....

    The varnish petrol residue is HORRIBLE to remove. I tried the petrol and gravel method - limited success.
    I then tried warm water and Oxy cleaner for two fills and lo and behold a reasonably clean...
  7. Thread: 900 sei

    by Cosmo
    Replies
    3
    Views
    366

    Hello Hans, I tried re-soldering new wires on...

    Hello Hans,
    I tried re-soldering new wires on Sei pick ups myself, but had an intermittent missfire, so gave up on the Bosch system and bought a Sachse.

    You could use a Boyer, Newtronic/Optonic...
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    305

    Hi Chris, Do explore all possibilities, get the...

    Hi Chris,
    Do explore all possibilities, get the wheel in a jig to check runout of the discs and the wheel rim and hub and I hope you solve the problem. Also check the obvious - those big 2 piston...
  9. Replies
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    305

    I don't know of one, but I think the Moto Guzzi...

    I don't know of one, but I think the Moto Guzzi Spada 1980 ish 18"- 2.15 one is a direct match for the spoke shape (so are the discs) There may be a "guzzi" casting mark, but you'd be pushed to find...
  10. Thread: 12v 2c

    by Cosmo
    Replies
    6
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    1,365

    See Boyer Bransden in the UK. Search boyer power...

    See Boyer Bransden in the UK. Search boyer power box. The mod is completely reversible if your loom is OK. You'll just have the ignition system to check, but I don't know how the 2c is wired or...
  11. Thread: 12v 2c

    by Cosmo
    Replies
    6
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    1,365

    You could look into fitting a boyer power box. As...

    You could look into fitting a boyer power box. As long as you have power out of your present generator, the unit is an accumulator and gives a solid 12v which you can feed a battery or the lights...
  12. Replies
    4
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    562

    Keep looking for another lump. As you may know...

    Keep looking for another lump.
    As you may know I have fitted a Sei engine in a 504 sport, so it'll drop straight in to your LS. A Honda CB500F or CB 550 will also drop in using the original Benelli...
  13. Replies
    7
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    682

    I admire your ingenuity. I replaced all the taps...

    I admire your ingenuity. I replaced all the taps on my bikes with Moto Guzzi bap replacements without the bowls immediately. From previous experience of leaks they were a fire loss waiting to happen....
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    1,365

    Steve, Don't be too daunted. The engine...

    Steve,

    Don't be too daunted.
    The engine really is quite simple excepting there are six reciprocating elements to deal with.
    The main issues will be corrosion & rubbish fastenings etc as noted...
  15. Replies
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    4,357

    Looking good! :-) By the way, if you can't source...

    Looking good! :-) By the way, if you can't source original CEV indicators rather than Lucas, and you want some. Try searching online for Indian scooter specification parts. For general information,...
  16. Thread: 500 Quatro

    by Cosmo
    Replies
    10
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    1,288

    Hi Carl. The standard ball bearing and cups have...

    Hi Carl. The standard ball bearing and cups have no dust covers, but your bearings don't look like they are seated down in the cups properly. It maybe that bicycle ball bearings have been used of...
  17. Thread: 750 sei engine ?

    by Cosmo
    Replies
    16
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    2,396

    On your search, bear in mind that the 750 has a...

    On your search, bear in mind that the 750 has a unique RH clutch case and internals because the alternator rotor is piggy backed behind the crankshaft on an outrigger shaft spun up off the top of the...
  18. Thread: 750 sei engine ?

    by Cosmo
    Replies
    16
    Views
    2,396

    It is a 1978 Sei electronica spec 750 engine with...

    It is a 1978 Sei electronica spec 750 engine with a sachse ignition. Built up with CB550 pistons, Ravasio wild cam and modded followers giving 820cc, so not quite a 900, but all is well tucked in and...
  19. Thread: 750 sei engine ?

    by Cosmo
    Replies
    16
    Views
    2,396

    I have done it! The sei engine does indeed fit...

    I have done it! The sei engine does indeed fit straight into a 354/500/654 frame, engine plates and all. It's very naughty, but with a bit of bracing and mods or replacements to the suspension you...
  20. Replies
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    No worries, and I'm just glad if any of my...

    No worries, and I'm just glad if any of my suggestions helped. Good luck with getting to the bottom of the problem and getting another Sei back on the road.
  21. Replies
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    As you have retained the points, look at the...

    As you have retained the points, look at the condensers too. Excessive sparking between the points gaps are a giveaway of failing condensers and you may only have them failing when they get hot. They...
  22. Thread: Help needed

    by Cosmo
    Replies
    4
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    479

    Hi, If you are in Europe, you can still get...

    Hi, If you are in Europe, you can still get reproduction brackets here...BENELLI - Motostoricheitaliane
    They look good for 50Euros, and the photos may help if you are going to make them but I...
  23. Replies
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    698

    Yup, those symptoms do sound like the advance...

    Yup, those symptoms do sound like the advance mechanism or the cam timing.
    It should do way more than 70 - even if you are a fellow of "larger" stature.

    With points, full advance is at about 4000...
  24. Replies
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    698

    The standard exhausts should be open (and loud)...

    The standard exhausts should be open (and loud) Silentium 2-1's on each side with balance pipes between the inside headers at the silencer joint. The later 354 sport II's had more restrictive quieter...
  25. Thread: 2C fork tubes

    by Cosmo
    Replies
    11
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    1,487

    I have bought a fair few Guzzi parts form "Nics...

    I have bought a fair few Guzzi parts form "Nics Euro bits" it is worth bookmarking his site for Benelli compatible parts and is a reliable service.
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