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Won't start after winter maintenance....

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  • Won't start after winter maintenance....

    Before I started this project, I thought I was fairly mechanically inclined. My bike has fought me the whole way through. Please bear with me while I vent and ask a few questions...

    I set out over the winter to do a valve adjustment. I figured while I had everything apart, that I would perform a few upgrades. Aside from noisy valves, the bike ran 100%. Only had 3k on it when I bought it and got put away with about 10k on it.

    I adjusted the valves to the best of my ability and replaced the valve cover gasket. I'm confident the valves are correctly adjusted, as I went through the procedure twice, being a bit nervous as a first timer. I pulled the carbs, cleaned them and jetted them with an Ivan's kit. I got everything back together and spent a week trying to get the bike to start. I had spark, I was pretty sure I had one night I just decided f***k it, I'll spray some carb cleaner in the air filter and see if that gets her going. Sure enough, it fired, idled and ran steady.

    It was at this point that I noticed some gas leaking out of carb 1's bowl. Seeing as how I had never disassembled carbs and set float height, I figured this was the culprit of my problem. Things went downhill fast. While draining the tank to get the carbs off, I ran inside to check a tutorial on float height, and much to my dismay, returned to find the tank on the ground dented. Fine. I can deal. Paintless dent repair here I come.

    In my haste and excitement emptying out the carb bowls, I managed to "superman" (use a ratchet and allen wrench type socket) the plug back into the bowl, splitting it. I located a new bowl and had it shipped to me.

    This brings us up to this week. I disassembled the bottom ends of the carbs, again, to reset float height. The gasket on bowl 1 was the culprit of the fuel leak problem, but i felt it couldn't hurt to check my height. I've got everything back together and I can't get the bike to start. It's been 3 days of frustration.

    There is spark, I'm pretty sure there is fuel. I hit the air cleaner twice with carb cleaner and it ran for a few seconds before it died. I pulled the fuel filter off with the hose still connected to the tank and got fuel coming out in the PRI position. reconnect and it'll just barely fire but won't catch.

    I know there's a trick with the vaccum system to the first startup. What am I missing? Should I pull everything and adjust valve clearance again? It ran with the carb leak prior, so I don't think this is necessary. Any help, suggestions or a check list of things I could be missing would be great... I'm really wishing I bought a fuel injected bike at this point...
    Power is nothing without control.

  • #2
    Since it will run with the spray, I would guess a fuel delivery problem. Will it start in with the fuel selector in prime?

    When you tore down the carbs did you make sure the pilot jets were clean? Also, is the choke operating correctly? Are the air/fuel mixture screws 2.5 turns out (or whatever the Ivan's kit recommends)?
    "The Lord will be awesome to them, for He will reduce to nothing all the gods of the earth; people shall worship Him, each one from his place, indeed all the shores of the nations." - Zeph. 2:11


    • #3
      Won't start in prime, either. Carbs were ridiculously clean as they were...really didn't need to mess with them, but cleaner and compressed air was successfully blown through all jets. Choke is sliding correctly and moving plungers as normal. Screws are 3? turns out.... whatever Ivan's instructions calls for.
      Power is nothing without control.


      • #4
        3 things control idle (and thus directly affect starting the bike) in relation to the carbs...

        fuel/air screw settings (2.5 or 3 turns should be fine for stage 1 kit or less)
        Float height (if set incorrectly, too much or too little gas flows. 1mm is a HUGE difference here)
        Pilot Jets (if clogged with varnish or debris... no start or idle.)

        If you squirt an accelerant (like carb cleaner) into the carbs and the bike runs well.... Your timing is good and not the issue. Fuel delivery is.

        Something is not set up right in the carbs, or something is preventing fuel delivery.

        Are you attempting to start the bike with everything back in place?.. tank, airbox, etc...

        93 750 Kat

        Modified Swingarm, 5.5 GSXR Rear with 180/55 and 520 Chain, 750 to 600 Tail conversion, more to come. Long Term Project build thread

        "I've done this a thousand times before. What could possibly go wron.... Ooops!"