“New” ‘86 - Multiple Issues (carbs, Vboost, oil leaks

Discussion in 'VBoost Room' started by desert_max, Feb 8, 2020.

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  1. Feb 8, 2020 #1

    desert_max

    desert_max

    desert_max

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    Just picked up a ONE OWNER 86. Cosmetically pretty nice, but been laid up for several years. Battery dead, did not hear it run, but got an outstandingly good price on it.

    It is turning into a handful! Carburetors, questionable fuel pump, Vboost inoperative, two massively leaking valve cover gaskets, fork seals.

    The thing that has me most puzzled is that it only runs on the two rear cylinders. Do the two front cylinders have anything in common? The feeds from the TCI appear to be individual for each coil, so that unit might be ruled out. However the pick up coil’s impedances measure in spec, the ignition coils primaries and secondaries both appear to be intact as well. That really only leaves the TCI. Does that sound right? I suppose I could coincidentally have two dead front carburetors, but the slides are working well, they are receiving fuel, but still don’t work either at Idle or up on the mains.

    I am lucky enough to have a bucket full of spares from previous Vmax’s but I don’t want to start throwing parts at this thing indiscriminately. Trying to put a little science behind it. But this one has me stumped. Any suggestions?
     

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  2. Feb 9, 2020 #2

    Fire-medic

    Fire-medic

    Fire-medic

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    '85-'89 TCI boxes are the same, '90-'07 is another style/type. The '85-'89 TCI boxes are known to go-bad after time, more-than the '90+ TCI system. I think the Ignitech box can replace the early box, and I think Sean Morley has them (one2dmax@aol.com).

    The early ignition system can be replaced with the later system, but you have an expensive process, unless you have a 1990+ donor bike with good electrical parts. Pretty-sure that route requires the replacement of the stator, rotor, pick-up coils, wire harness, TCI box, and probably more.
     
    Last edited: Feb 9, 2020
  3. Feb 9, 2020 #3

    one2dmax

    one2dmax

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    I would agree. Most likely a bad CDI box. I have one remaining early OEM box and just a few Ignitechs on hand.
     
  4. Feb 9, 2020 #4

    desert_max

    desert_max

    desert_max

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    PM sent, Sean. (Been a while but looks like we're gonna do some more "bidniss")
     
  5. Feb 9, 2020 #5

    desert_max

    desert_max

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    Well, two things.

    One, I am not smart enough to figure out or remember how to PM on this board.

    Two, I just remembered that my spare CDI is from an 85! I was thinking 94. So, I'm good I hope. Don't fret, though Sean. I'm sure we will still do some of that bidniss for this beast. It is a little needy. You probably wont remember, but we have done a few transactions in the past. I think you even bought a pair of scoops from me.

    Glad to see the Vmax community still has its pillar!
     
  6. Feb 11, 2020 #6

    one2dmax

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  7. Feb 14, 2020 at 3:34 PM #7

    desert_max

    desert_max

    desert_max

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    I'm not going to make this a blow-by-blow for this bike's come back. You guys have seen and heard it all before. But, I feel compelled to complain bitterly about accessing and removing the electrical tray containing the TCI, front two coils and Vboost servo. What a pain. I have invented several choice new four letter words. So far, that hasn't been enough. Currently having lunch and licking my wounds. Literally. Finish later.

    Sheesh.
     
  8. Feb 14, 2020 at 4:13 PM #8

    mabdcmb@yahoo.com

    mabdcmb@yahoo.com

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    Maybe go a step further and remove the valve covers, adjust the valves, and install new cover gaskets. You've got half the work done already.
     
  9. Feb 14, 2020 at 5:15 PM #9

    desertrefugee

    desertrefugee

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    Oh yes! Valve covers are high on the list. They’ve been leaking a couple of decades I think. Quite the mess.
     
  10. Feb 14, 2020 at 7:45 PM #10

    desert_max

    desert_max

    desert_max

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    Absolutely! Those are very high on the list. The things been leaking for a couple of decades I think. What a mess.
     
  11. Feb 14, 2020 at 11:10 PM #11

    mabdcmb

    mabdcmb

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    Shoot Sean and email and see if you can get one of his loaner valve adjustment kits. It has the tool to compress the bucket, a magnet for the shims, and plenty of shims.

    If you do borrow it,be sure to get some OEM head gaskets from him too.
     
  12. Feb 14, 2020 at 11:14 PM #12

    mabdcmb@yahoo.com

    mabdcmb@yahoo.com

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    Send Sean an email asking about a valve adjustment loaner kit. He had a couple floating around. They have tons of shims, the bucket tool and a magnet. He will sell you some OEM gaskets too.

    There is a great write up in the how to section on adjusting the valves.
     
  13. Feb 15, 2020 at 12:07 AM #13

    Julian Tomkins

    Julian Tomkins

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    I couldn't get the part out with the front coils on either, when I needed access to them I found it easier to release the radiator, the manual says just undo the bolts and slide it out......yeah right :confused:
    good luck with yours
     
  14. Feb 16, 2020 at 5:23 PM #14

    desert_max

    desert_max

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    Sure helps if you disconnect the Vboost servo...

    Got a few parts on the way from Mr. Morley. Handy fellow to have around.
     

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