97 BMW F650 won't start after 3 yrs...suggested solutions ?

Discussion in 'Technical & Maintenance' started by townieglenn, Oct 21, 2018.

  1. townieglenn

    townieglenn Member

    Hi Folks- It's time for me to stop abusing my 1982 R/80 GS and put the F650 back on the road ..aside from replacing the original starter, ( remember, anyone? Murph? saved by the kickstart pedal that time ) I've not had to do much to this bike other than gas and oil :)
    So I've re-assembled the F-bike and have no parts left over . This is what I know for sure ...
    -bike is dual carbs on a single cylinder
    -carbs were not disassembled
    - battery has been on Maintenance/trickle charge for the duration... showing good voltage and will turn the engine over for a good minute or so (ouch)
    - fuel is fresh, carbs are getting fuel
    -plugs are not new but bike was running fine when put it on the lift-no issues other than the "thunk" from the rear shock mount.This was the reason for exploratory dis-assembly. Plugs look good and are not fouled
    - fuses checked and all good
    -have tried pulling the plug and looking for spark while cranking- i see no spark:( ( not recommended I have read)
    -coils perhaps ?
    - could be the plug caps? these have never been apart so I don't suspect them really

    that would be as far as I got with trouble shooting- I don't really want to haul the whole works apart again ..you have to remove all kinds of plastics and the tank and air box and a bunch of other stuff to get at the carbs and I'm reasonably sure it was all re assembled correctly...

    so it seems to me that the plugs are not sparking..or perhaps "air lock " ? I'll try new plugs and hope for the best..

    Any thoughts and suggestions would be greatly appreciated ..other than than that I'll hafta wait til Spring and put her in for the 90,000 km recommended maintenance and hope they can resuscitate.
     
  2. RossKean

    RossKean Active Member

    Is any gas making it to the cylinders? Try pulling plugs and adding a small squirt of gas directly to cyl and try to start again. Rules out fuel delivery.
     
  3. townieglenn

    townieglenn Member

    Yes- forgot to mention that step.. that was my first try.. thought i heard it almost catch but after 4 more tries no luck . Even removed the other pug and dribbled gaso in that hole..same result ! Plugs seem to be wet after these attempts..
     
  4. sleepyhead65

    sleepyhead65 Member

    sure sounds symptomatic of no spark. three years of sitting may equal corrosion on connections. that would be my first thought. but yes coils too
     
  5. skibum69

    skibum69 Active Member

    Did you check for spark?
     
  6. Backdraft

    Backdraft Active Member

    Timing??????
     
  7. Wayne

    Wayne Well-Known Member

    I'm not familiar with BMW, but will the engine crank and produce no spark with the kill switch activated? Might be worth check to make sure the kill switch is in the correct position. I've read stories before where the kill switch was overlooked.
     
  8. Wayne

    Wayne Well-Known Member

    He said he sees no spark.
     
  9. Wayne

    Wayne Well-Known Member

    He said he sees no spark.
     
  10. RossKean

    RossKean Active Member

    If you are getting gas, spark is definitely the next step.
    Make sure you are getting compression as well. Good chance of a stuck ring or valve not seating properly. Might try a small slug of Seafoam in the cylinder and let it sit overnight. The Seafoam may dissolve the goo - but turn the engine over very carefully by hand and re-oil the cylinders before trying to start. The Seafoam will wash oil from the cylinder walls.
     
  11. Wayne

    Wayne Well-Known Member

    Did you ground the spark plug when checking for spark?
     
  12. townieglenn

    townieglenn Member

    Ah Hah ! I did not ground the plug when i checked for spark ! I have a small alligator clip that i can clip to the frame .. so if i do get a spark, that will tell me if the coils are working properly i presume..
     
  13. Wayne

    Wayne Well-Known Member

    Well, ideally you can buy a voltage test from Princess Auto for maybe $10, and that will measure the coil output. Just be sure not to have your fingers anywhere near!
     
  14. townieglenn

    townieglenn Member

    She will not turnover with kill switch engaged
     
  15. Wayne

    Wayne Well-Known Member

  16. townieglenn

    townieglenn Member

    copy-thanks Wayne !
     
  17. townieglenn

    townieglenn Member

    just tried again with grounded plug- I have spark !
     
  18. Wayne

    Wayne Well-Known Member

    Gas and spark is a good thing.....I'd try drying off the plug really good and clean it up if it's dirty. Or try a new plug...and try the process again.

    Is the battery strong enough to spin the engine good? Is the battery a 'maintenance free' type battery or one with removable caps? A fully charged battery will read 12.6v
     
  19. Backdraft

    Backdraft Active Member

    Give you a hundred bucks cash!!!!
     
    Wayne likes this.
  20. skibum69

    skibum69 Active Member

    Halfway there, wanna come help me pull the engine on my 640 when I get home?:p
     

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