1985 VF750F

Discussion in '1st & 2nd Generation 1983-1989' started by OttawaWill, Jul 17, 2016.

  1. OttawaWill

    OttawaWill New Member

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    Hello all,
    A few years ago I came into possession of this bike. I've run into an engine issue and am considering options. Over if the trans for the couldn't bypass house that goes from one side of engine to the other had cracked. My goal is to keep cost down. Are the 750 interchangeable between the interceptors, sabres?
    Will

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  2. Allyance

    Allyance Insider

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    Are you talking about this large hose? (Not the braided line)
    [​IMG]
     
  3. OttawaWill

    OttawaWill New Member

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    There is a tube that goes between the cylinder heads. I would take a picture but it's a hot away at my parents garage. I'll take a picture next week end.

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  4. Arnzinator

    Arnzinator New Member

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    I think he means the coolant line that sits in the "V" of the engine. It's been a long time but I remember it as chromed or stainless steel. With black end caps that bolted down from the top. I think it comes directly off the water pump (?).
     
  5. OttawaWill

    OttawaWill New Member

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    Yes that's the one. Basically of the bolts broke the head off and when trying to remove with bolt extractor kit it caused more damage.

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  6. OttawaWill

    OttawaWill New Member

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    By the way love the 25th anniversary VCR with the red white and blue... hopefully will upgrade to either the 2007 or 2009 white and black... but fourth things first get this 85 resurrected and road ready.
    Will

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  7. Allyance

    Allyance Insider

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    Ok, I know what he is talking about, chrome tube has o-rings and fits into cast housings. I can help you if you need parts, are bolt holes in block damaged?
     
  8. OttawaWill

    OttawaWill New Member

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    Yes bolt holes in block damaged.

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  9. Allyance

    Allyance Insider

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    Do yuo what a heli-coil is?
     
  10. OttawaWill

    OttawaWill New Member

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    Yes, don't know that this would work in this situation as where the pipes is mated to the engine it is raised and the damaged hole is at the edge of this raises surface and is split... hard to explain... I had considered different options to repair from jb weld to removing the engine assembly and bringing to welder and machine shop... hence the ideas of finding a replacement engine.... will attempt to remove engine this weekend.

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  11. NormK

    NormK New Member

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    Has to be a way to fix it without ditching the motor, bit hard to tell without a pic
     
  12. OttawaWill

    OttawaWill New Member

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    Will post pics. Taking engine out this week end. Please feel free to offer thiughts and suggestions. I appreciated everyone's interest and support.

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  13. squirrelman

    squirrelman Member

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    OK, Will, you don't have an '85 VFR cuz VFRs didn't appear until '86, right ? If you have an '85, it's a VF, see ?
     
  14. OttawaWill

    OttawaWill New Member

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    My apologies it's a 1985 Honda interceptor 750CC

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    Last edited: Jul 18, 2016
  15. OttawaWill

    OttawaWill New Member

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    Here's the pics, engine still in bike. Considering options.. 14000 miles on this bike.
    Will uploadfromtaptalk1469393784404.jpg uploadfromtaptalk1469393797166.jpg uploadfromtaptalk1469393803059.jpg

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  16. NormK

    NormK New Member

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    What I would try is fill the hole with JB Weld and screw a piece of threaded rod into it so it becomes permanent and then you can just put a nut on it to hold the thermostat housing down hopefully
     
  17. OttawaWill

    OttawaWill New Member

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    Wow.... I've got to say I sincerely apologize for the atrocious posts I've made. I am ashamed.
    Ive corrected my mistake in the Title of the thread. Thanks for the heads up sorry it took almost 4 years to fix it.
    I hate having threads with no resolution.
    I had to put this, for lack of a better word "project" on hold back in 2016 as a result of family health concerns.
    Im back at the point where I'm going to take some time over the summer to see what I can accomplish.
    I was where the bike is stored and looking at it sitting there is eating away at me.
    I will try to post an update once I have had a change to remedy my current concern and also resolve ownership concern.
    Regard,
     
  18. Captain 80s

    Captain 80s Member

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    Fill it with JB Weld and drill and tap (maybe even drill and tap for helicoil). With a new o-ring (and a light coat of HondaBond perhaps) that cover will never have to come off in your lifetime. And it is a super low torque application. And it's not cracked on the inside. I would "tighten" that one first on assembly and finish on the good side. And I would sleep easy.

    Or what NormK said above. Make it a stud, that sounds even easier. Really, either way, should be good.
     
    Last edited: Mar 29, 2020
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  19. OttawaWill

    OttawaWill New Member

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    So this bike has not likely run since the early nineties.
    My plan of action is to :
    • Make sure the engine isn't seized (no reason to believe it is) maybe drop an oz. of oil down each cylinders.
    • Check compression
    • Repair the damage pictures in p#15
    • change the oil & filter
    • change the plugs
    • Install intake (carb, plenum and air box)
    • Hook up a remote fuel tank
    • try to start it.
    If I can get the engine running then I can tackle other essential items.
    I had considered breaking down the carbs but I want to leave them undisturbed if possible (less likely of
    miss-adjustment, leaking fuel feed o-ring) to make getting engine up and running first.
    May pull the float bowl and top cover (if float bowl looks good) while they are still assembled together.
    I will take the Intake Runners/trumpets/air tubes off and clean them all before re-install (dust/debris from storage). There a bit of corrosion on some of the port on the engine side.
    Suggestions/comments?
     

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    Last edited: Mar 29, 2020
  20. Captain 80s

    Captain 80s Member

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    As long as you plan on removing the carbs later and really addressing them, go for it. But, in order to remove the rubber intake tubes, you have to loosen the plenum. When you loosen the plenum, you have "disturbed" the carbs, increasing the chance of the fuel tubes leaking/cracking.

    Just make sure at some point the carbs get really "rebuilt". I'm going thru all of my 35 year old V4s and one thing they all have in common... the fuel tube o-rings crumble in my hand. The same with the 86 VFRs 3 of my friends have.
     
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