Honda vf750f valve timing

Discussion in 'Motorbike Technical Discussion' started by brazier.joe, Mar 17, 2007.

  1. brazier.joe

    brazier.joe Guest

    hi i have bought a non running 1983 vf750f and after some hours of
    swearing and kicking the thing i cant get it to run i after cleaning
    and setting the carbs up and then checking the ignition timing i have
    found that the previous owner must have had the heads of at some point
    because the valve timing is wrong. i set the cams on the rear cylinder
    to line up with all the timing marks but the front cylinder timing
    marks seem to be wrong the valves hit the piston if you linr the marks
    up. i was told that the marks on the front cylinder cams are wrong and
    that you are supposed to mark the cams before you take them off
    unfortunatly the previous knit wit didnt put the cams to the corect
    timing and he did not mark them. so can anyone tell me what the timing
    should be for the front cylinders.
    brazier.joe, Mar 17, 2007
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  2. brazier.joe

    John Johnson Guest

    Please don't tell me that you're doing this work without a service
    manual; really, even if you don't have one, I don't want to hear about
    it. In any case, you should head over to:

    info, tips, techniques, and lots of other things for early Honda V4s


    'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
    John Johnson, Mar 17, 2007
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  3. brazier.joe

    Mike Freeman Guest

    What he said. In addition:

    *You can get a Honda shop manual from:
    *You can contact Dave Dodge ( who specializes in Honda V4s
    *You should probably go ahead and replace the cam-chain tensioner if
    you're going to be monkeying with the cams anyway
    Mike Freeman, Mar 17, 2007
  4. <Snip>

    Buy a manual or payt SWK to do the job properly.

    No, better still - it's a horrible Honda VF750F, so throw it away.
    The Older Gentleman, Mar 17, 2007
  5. brazier.joe

    John Johnson Guest

    Note that Helm is Honda's US distributor. I don't know if they ship
    outside the USA(in case the OP isn't in the US).
    Probably true, and there are people here who know more about the early
    V4 engines than I do, but just from that one post, I think that the OP
    should get a knowledgeable second opinion before starting to buy parts
    (unless this is a love-not-money project). If someone put the cams back
    on in such a way as to cause valve interference, Dog only knows what
    else they did wrong, or how hard they smacked the valves into the
    pistons finding out their mistake.

    The OP is already looking at checking the valves (bent?) and pistons
    (holed?). Hopefully everything's fine, but if either valves or pistons
    are toasted, it might be better to find a bike in nicer shape and use
    this one for parts or something, particularly if the rest of the bike
    was hacked on like the head was.

    Don't take this as saying that it's not worth working on. I'm just
    saying take a real careful look before starting to spend money on it, as
    it might very well turn into a deep hole.


    'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
    John Johnson, Mar 17, 2007
  6. Agreed.

    That model was one of the most unsuccessful and unreliable Hondas ever
    built: a byword for mechanical catastrophe. It will swallow cash in one
    gulp, burp, and then demand more.

    I really wouldn't spend anything on it. If it doesn't work, throw it
    away and move on.
    The Older Gentleman, Mar 17, 2007
  7. brazier.joe

    Mike Freeman Guest

    (The Older Gentleman) wrote in
    Are you confusing the VF750F with the 'C and 'S models and their cam
    problems? The Interceptors seemed to be less suseptible to it.

    And, in my experience, are a hell of a lot easier to work on than the
    Sabres and Magnas.
    Mike Freeman, Mar 17, 2007
  8. Not really.
    The Older Gentleman, Mar 17, 2007
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