Honda XL500R starting problem

Discussion in 'Thumpers' started by john479, Feb 19, 2013.

  1. john479

    john479 Been here awhile

    Joined:
    Feb 28, 2011
    Oddometer:
    113
    Location:
    United Kingdom
    Hi all,
    I'm in need of a little advice on my XL500R restoration.

    I can't get it to start or when it does, it only runs for 5 seconds. I've found that if I hold my manual decompression lever on and kick it over to prime it and then kick it, it sometimes does start but for only about 5 seconds. This makes it sound like a fuel problem but I've thoroughly cleaned the carb and used a good rebuild kit. It has a good spark and plenty of compression, so much that when trying a bump start, it locks the back wheel up. Tried a different CDI but exactly the same.

    Anyone got any ideas?

    Thanks,

    John
    #1
  2. john479

    john479 Been here awhile

    Joined:
    Feb 28, 2011
    Oddometer:
    113
    Location:
    United Kingdom
    I'm getting good flow throught the petcock and needle. Can't see I have an intake leak as I've changed the o-rings on the rubber boot and spacer and they''re done up tight. Exhaust is fine as I tried it without the exhaust and it did the same thing - ran for a few seconds if I prime it with full choke, holding decompression lever in. Then big kick and it will start but die after a few seconds. Does behave like fuel starvation.

    I'll try a squirt of easy start and see if it fires. Bike is 1982 so single carb

    Thanks
    #2
  3. Andyvh1959

    Andyvh1959 Cheesehead Klompen

    Joined:
    Feb 16, 2012
    Oddometer:
    830
    Location:
    Da frozen tundra eh? 1.5 mile west of Lambeau
    When you say you cleaned the carb, did you actually completely disassemble it and clean all internal passages and jets manually? When I do this I use strands of copper wire pulled from 12ga or 16ga wire and I push it through all the jet holes and carb passages. Then I blast them all out with carb cleaner. Then I blast them all out with compressed air.

    This is the only thorough way I know to really clean a carb. No amount of soaking or carb cleaner does it without actual breakdown and manual cleaning.

    That said, is the float level properly set? Any internal screen/strainer in the carb cleaned? Is the fuel shut-off valve in the carb free to open and clear? That is the little valve above the float level arm.
    #3