Need Help- New owner of a non starting 85 VF700 Interceptor

Discussion in '1st & 2nd Generation 1983-1989' started by shigs, Nov 19, 2010.

  1. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    Dude, do I have to say it again?

    compression test.

    it's as easy as removing a spark plug and will verify all the dam mechanical parts like timing chain.

    You'd rather f' around removing valve covers than a spark plug and screwing in a compression gauge? Once compression is verified you can move on to fuel etc...
     


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  2. shigs

    shigs New Member

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    Been awhile since I've been on. Compression test was just fine, in the 160-170 range on everything. Chains are snug. Still baffled!
     


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  3. crustyrider

    crustyrider New Member

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    I bet still hedging my bets on it being the kill switch....... the thing will still turn over but won't fire ..............try this....put some gas down the carbs turn it over pull a plug..it should be wet... if its not then you may have a dead mouse and company living in your manifold....
     


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  4. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    Next step:
    Have you verified spark is present on all four spark plugs? There should be two coils with two plug wires per coil. You also have two CDI boxes and the pickup unit. Lots of potential for failure or improper connections.

    Fresh spark plugs would be recommended. While spark might be present when checked outside the motor, it can be weak or insufficient to initiate combustion in the compression chamber. I don't like to put a dime into an non running motor before I get her to fire - but in this case, spend $2.50x4 and get you some fresh plugs.

    Just went through the same thing on my ice auger. Getting ready for ice fishing, old gas fouled out the plug. Had spark but looked like it might be weak. New plug and it fired right up.
     


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  5. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    crusty, post #15, he's even tried starter fluid
     


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  6. shigs

    shigs New Member

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    Replaced all plugs and have strong blue spark. I'm leaning toward the kill switch idea. I figure I can disaasemble it and wire it up to bypas the kill button. Anyone know which wires I need to hook up or have any suggestions?
     


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  7. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    If you have strong blue spark, then what makes you think your problem has anything to do with the kill switch?

    Did you check all four cylinders for spark as I asked above?

    You wouldn't happen to have a trailer hitch?
     
    Last edited: Jan 2, 2011


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  8. crustyrider

    crustyrider New Member

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    pull the carb body off using a spray bottle spray some gas into the intakes you should at least get one cylinder to pop off and try to start.....
    and yeah it does work I ran my VW like this for about ten seconds before I over flowed the gas
     


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  9. shigs

    shigs New Member

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    I have a feeling that my previous posts aren't being read....I have a feeling mos
     


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  10. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    Assuming you checked for spark in all four cylinders, since you haven't provided a specific answer.

    You've checked compression which verifies all mechanical components

    And tried using starting fluid....

    I could theorize that if your exhaust was plugged tight with a mouse or squirrel nest, you could still build compression in the cylinder but the engine wouldn't breath well enough to inhale the starting fluid you sprayed.
     


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  11. squirrelman

    squirrelman Member

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    Come on Tinkerbelle ! A squirrel wouldn't fit into a muffler, too large for it, besides they don't like bad-smelling stinky, greasy stuff.

    But mice can and do stash things in exhaust pipes, as the photo illustrates, what i shook out of a VFR muffler that sat in a shed for 2 years.

    We've covered just about everything that might be keeping this guy's bike from starting, but what about misplaced sparkplug wires.
     

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  12. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    sorry.

    I see the error of my ways and take back the squirrel thing :thumbsup:

    I'm assuming you read through the thread? Assuming the OP was thorough and giving us all the information, you have no other suggestions to offer?
     


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  13. shigs

    shigs New Member

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    All 4 have spark, pulled exhaust, not clogged
     


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  14. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    there's really nothing left but carburation or tear it all down to individual parts and ebay.
     


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  15. crustyrider

    crustyrider New Member

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    ok since you have narrowed it down... to carburetion....carber.... err the carbs... have you had the carbs off? (this is a mental yes no question) if you have did they seat right when reinstalled? check all you rubber vac line hoses while your at this.. remember way up top when doodlingwithparts said the petcock runs on vaccum? oh and if you did take them off, How did you reinstall them? did they go right back on? or did you beat them back into place with a hammer and a piece of 2x4 over top?( sounds crazy but there are a few dumbasses that have done this[myself included, so don't tell anyone]) once you verify that the carbs are back on correctly try it again...

    Oh you never said if the plugs were wet of dry after you poured gas into the carbs? do that too.
     


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  16. squirrelman

    squirrelman Member

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    ....but, Crusty, he was using starting fluid to eliminate carbs as a possible problem and still no POPs.....so i suggest he might have wrong spark timing, wires going to to wrong plugs ?? For example, maybe left front wire is mistakenly switched to right front, etc.

    Easy to switch around and try again.

    Or maybe a battery with not enough power ?
     


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  17. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    With old style induction timing gun, a person should be able to connect to presumed #1 wire and view timing indicator on the crankshaft while cranking yes?
     


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  18. squirrelman

    squirrelman Member

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    That should be a good way to verify which is the # 1 wire, but as everyone knows, the Honda cylinder numbering system is a bit confusing.
     


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  19. Pcohen

    Pcohen New Member

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    +1 ON THE WEAK BATTERY!!

    Really. Check it
     


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  20. shigs

    shigs New Member

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    Finally got back to tinkering.... figured since I've exhausted all other avenues, I would pop the kill switch open and try to jump the connection. Pretty sure I shorted it out because after a couple tries with the bike trying to start, it now does nothing when I hit the start button. I clipped the 2 wires to the kill switch, connected them together, and still nothing. All lights still work and bike has full power. Is there a fuse for the kill switch??????
     


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