recoil backlash on 13ph Honda

Discussion in 'Mechanic and Repair' started by lakesregionscapes, Feb 7, 2007.

  1. lakesregionscapes

    lakesregionscapes LawnSite Member
    Posts: 145

    OWW!
    Sounds like a stupid issue, but it's getting really old, really fast....
    We have a Honda 13hp commercial walkbehind unit with the snowblower attachment: on it's second motor, around 2 years. Been running it as a mower and a snowblower: slick setup.
    We usually do our own repairs - husband is no stranger to small engines, but this one has got us - and it HURTS. (When I say we - I hand him the wrenches and thread tiny carburator screws back in...:rolleyes: )

    This machine is usually an easy start, 2 pulls and it's going no matter how cold it is (Love that synthetic oil). Recently it doesn't pull smoothly some of the time - catches randomly - feels like the engine is resisting, not the recoil assembly though. Once it's running it's fine. Even more recently, at random moments it will rip the recoil handle out of your hand: if you're holding loosely it feels like your fingers got ripped off, and if you hold tight it feels like your wrist just got broken... It will fire up for a few seconds sometimes, but it can't seem to stay running long enough to settle out; in my opinion because it is being pulled to many times and either the choke isn't where it wants/needs anymore, or it's half flooded at that point. Leaving it 'til the next day hasn't helped - it's been dead on the trailer for several days, resisting multiple attempts to fire it up. Problem being no one want to pull that damn rope anymore.

    Wondering if the recoil isn't releasing correctly at these times or if there is another explanation. Recoil assembly was taken off, and lubricated with graphite - it seemed in fine working order either way.

    Any ideas?

    Thanks!
     
  2. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    Having never worked on this particular engine the only two things that come to mind are similar issues that Kawi had on their engine. Kawi has a compression relief built on to the backside of their cam what it does is bumps open the exhaust valve to release extra compression for easier starting. What tends to happen most common is the valve lash setting gets too far out of spec and the valve does not open, and you end up trying to pull thought the compression. If you adjust the valves back to spec and it still does the same thing then the compression relief is broken(in Kawi's case repl the cam) or you may also have a sheered flywheel key causing the timing to be off. Hope this helps :)
     
  3. pugs

    pugs LawnSite Gold Member
    Posts: 3,022

    Yah, I would try adjusting the valves first...could fix you right up...
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    I agree with MM also, Check the valves with the piston at top dead center compression stroke. Intake should be .006 and exhaust .008
     
  5. mojob

    mojob LawnSite Senior Member
    Posts: 515

    I think mowermedic is on the right track. It sounds like the timing is too far advanced and is trying to fire before the piston is close to top dead center. This will cause the piston to reverse its direction and since the drive pawl of the pull start coil is still engaged, it causes the rope to retract.
     
  6. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    A bad flywheel key will do that also. It will alter the ignition timing.
     
  7. lakesregionscapes

    lakesregionscapes LawnSite Member
    Posts: 145

    Taking your recommendations home at lunch and we'll check it out...
    Thanks guys; I'll keep you posted on the outcome.
     
  8. lakesregionscapes

    lakesregionscapes LawnSite Member
    Posts: 145

    Turns out the flywheel on this one appears to be bolted, not keyed.... So on to the valve adjustment - did it yesterday afternoon, and she fired right up-YEAH! And he got it fixed before the next storm, yesss! (I hate it when the "plan B" is dead, cause I'm "plan c" ;-) )

    Thank to everyone for your help
     
  9. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    It's just nice to know things are running good. Glad you got it running!
     
  10. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    Congrats :drinkup:
     

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