Cure for the Cold Hearted?

Discussion in 'Motorbike Technical Discussion' started by RLB, Jul 31, 2004.

  1. RLB

    RLB Guest

    Howdy all,

    I bought an '81 KZ440 from a friend. It's a good bike once it's been
    warmed up, but it's a bear to get going. Starting isn't really an issue,
    but the bike misses alot unless it's had a good 5+ min warm-up. I'm not
    expecting perfection here, but was wondering if there are any tried and true
    cures to cold hearted bikes.

    I started small and changed the plugs today. It helped alot, but it
    sputters pretty good until it's warmed up. I haven't taken the carbs apart
    myself just yet, but my friend cleaned them out not too long ago. Wondering
    if hotter coils or a carb kit might be in order.... Or maybe these KZ440's
    are just cold hearted bikes. Another point of interest, the bike won't
    run on the left jug with the choke on full. About half-choke, you hear the
    cylinder start to fire. Normal or not?

    And finally, I need to replace the sprocket. Right now, the 45 tooth is
    comfortable around town, but 7000RPMs on the highway. I'm taking the bike
    to North Dakota (it's flat there) and am wondering how people like a 33
    tooth rear sprocket. Sorry, not really positive what is on the front, but
    I'm guessing it's stock. There will be alot of in-town riding, but the
    85mph highway trips are also pretty common up there. Any
    "been-there-done-that" opinions? Do people find the smaller sprocket
    comfortable in town on this machine?

    Thanks for reading
    Russ
     
    RLB, Jul 31, 2004
    #1
    1. Advertisements

  2. RLB

    Charlie Gary Guest

    Can't offer much about the carbs other than something's not right, but
    going from a 45-tooth to a 33-tooth sprocket is quite a change. Do you have
    a chain breaker to shorten the new chain? If you can track down the gear
    ratios, a little math can help you find out just how many RPM you'll turn
    with different combinations. There's a few ways to do it, but just about
    all of them will require knowing how many teeth are on both sprockets.
     
    Charlie Gary, Jul 31, 2004
    #2
    1. Advertisements

  3. RLB

    templar Guest

    I gotta 82 kaw 440 and mine does the same thing. I've started putting
    seafoam (nappa) every 10th fill up and it seems to help the startups but
    the long and short of it I think is the bike is getting alittle older and
    kinda like bikers the older they are the longer it takes to warm up.
    it's funny but when I go to work with it and leave it in the parking lot
    all day (out in the sun) the little pup starts up and doesn't take that
    long to get warm... I love my 82 but I would not take it out on the
    interstate unless I had to, back roads and cities are where that bike
    belongs, its just way to light for me to be out there. Good luck on your
    trip!
     
    templar, Jul 31, 2004
    #3
  4. RLB

    RLB Guest

    Ha ha.... I should clarify there, I'm taking it to North Dakota in the back
    of a truck for college. I have no interest in riding it that far. :p
    Thanks for the info.
     
    RLB, Aug 1, 2004
    #4
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.