JL50 won't start...Running out of options

Discussion in 'The Workshop' started by Tim Woods, Mar 20, 2021.

  1. Tim Woods

    Tim Woods New Member

    Messages:
    4
    Hi, I bought a JL50 as a lockdown project. Cannot get it to start! It has a good spark & new plug. Compression feels OK. Fuel tank was full of rust & water so thoroughly cleaned it out & new fuel. New fuel filter. New carb for good measure. It sometimes splutters for a sec or 2, but just wont start. Checked carb jets. Starter button doesn't work but solenoid & starter work ok by jumping the terminals; but I use kickstart anyway. Even a blast of cold start doesn't seem to help. Am I missing something?
     
  2. stubz90

    stubz90 New Member

    Messages:
    8
    Is there any earth cable form engine to frame
     
  3. Tim Woods

    Tim Woods New Member

    Messages:
    4
    Good question! When I tested the plug I earthed it to the battery. Will check earth cable tomorrow. Cheers!
     
  4. Paul Flatt

    Paul Flatt New Member

    Messages:
    6
    Also look at choke, cable or auto.
     
  5. MARSH

    MARSH Whooooo!

    Messages:
    2,984
    Rides:
    Piaggio Typhoon
    2t or 4t Valve clearance ?
     
  6. Tim Woods

    Tim Woods New Member

    Messages:
    4
    Auto choke. I'm pretty sure the default is open, then 12v is applied when engine running which closes it. Valves have some clearance when closed, will measure.
     
  7. Mark Emerson Trentham

    Mark Emerson Trentham Well Known Member. Staff Member

    Messages:
    8,426
    Rides:
    NSC110/ ET2/Zip 50.
    Fuel cap breather hole.?.
     
  8. Stevep

    Stevep Well-Known Member

    Messages:
    5,589
    Check the compression with a proper tester, there is no other way to gauge it, 10psi will 'feel' ok on your finger but it wont start the bike
     
  9. Tim Woods

    Tim Woods New Member

    Messages:
    4
    Sorted! I replaced the coil & ECU, spark didn't look any different to before, but it started first time. Thanks for all the tips!
     

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