Question about 1978 Suzuki GS 750 E

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I've replaced the coils, spark plugs and battery. I've cleaned the carburretors. But the bike will still not start. What could be the problem?

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  • Truckbuilder Mar 17, 2011

    I have checked for spark and found a problem with the points that i just fixed.... I now have spark on all four cylinders.... I spent last night checking for compression.... and i have compression in the third and fourth cylinders, but nothing in the first and second.... after tearing the engine apart that there is a stuck valve.... so im going to clean everything and put it back together and see what happens from there......

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  • 191 Answers

Did the bike run fine previously...or unknown history?

Does it crank the starter normally?

Have you verified with a grounded spare spark plug that the ignition is actually firing as you crank starter...if not...might be an interlock problem....is neutral light on...have you tried with sidestand up and clutch pulled in? Kill switch ON?
Usually the interlocks prevent cranking too but older bikes tend to get rewired by some ownerthats.

Not sure on your model, but some use vacuum operated fuel petcocks...if yours has them...have you tried setting them to PRI or prime position to fill carbs without vacuum?

Posted on Mar 17, 2011

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Yamaha RD400 fires on one cylinder when gas is added to the hole where the spark plug goes. Does not start without fuel added directly. Carbs have been cleaned and battery is charged but still I only get...


This bike has electronic ignition, if I remember correctly. Spark on one side indicates box may have failed or the trigger unit.. Try switching parts from one side to the other side, I.e. coil, plug, wires one at a time or if you have/can find good used or new parts to try. Are you certain all of the passages in the carbs are clean? If it starts and runs on one one cylinder by putting gas in cylinder, appears if your idle circuit is plugged or your choke circuit isn't working..

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My harley wont turn over


Instructions
    • 1

      Make sure the key and kill switch are both in the "on" position. Ensure that the proper starting procedures for your bike are followed. Is it in neutral? Clutch pulled in? Gas in the tank? Then try to start your bike. Does it turn over? If not, check to see that the battery is properly connected and the terminals are not corroded. If they're loose or dirty, clean and tighten them. Then, using a voltmeter that measures ac/dc and ohms, check to see that your battery has enough charge to crank the engine. If not, replace or charge your battery and try again. If it still doesn't turn over, there may be a loose connection between your battery and starter; a bad ignition or starter switchl or a bad safety relay. Check a repair manual for proper testing procedures for your bike, as each motorcycle differs.

    • 2

      If your bike turns over but doesn't catch, check to see that it's getting fuel. If the bike has a fuel petcock, make sure it is in the "on" (or, on certain bikes, "prime") position. Then remove the main fuel hose and check to see that fuel is flowing freely. If fuel isn't getting to the carburetor or injection system, your bike won't run. If that's the case, your problem is likely something in the fuel system. If fuel is flowing freely, reattach the lines. If it's not, check to see if the fuel filter is clogged, if a line is pinched or if the petcock is working properly. One way to determine if the problem is in your fuel system is to put a few drops of fresh gas into each spark-plug hole, replace the plugs and turn the bike over. If it starts and then quits, the problem is likely in the fuel system.

3
  • If you're getting fuel and the bike turns over but still doesn't catch or start, check the spark plug or plugs. Start by pulling off a spark plug wire, then removing a plug using the spark plug socket supplied in your bike's toolkit. Now inspect the plug. It should not be wet (usually caused by fuel, when the plug is not firing) or coated in carbon/burned oil deposits. Now check to see if the bike is getting spark. Although you can get a special, insulated set of pliers to hold the plug, there's a "quick and dirty" method for this: After reattaching the plug wire, lay the threaded part of the plug against the engine (not over the plug hole, as the spark could ignite any fuel that is blown out when you try to start it). Now, making sure you're not in contact with the engine or plug, hit the starter. You should see a nice blue spark. If you don't, make sure the threaded portion of the plug is touching the engine (but the electrode is not) and try again. If you still don't see a spark, you either have a bad plug or a problem with the electrical system. Check to see that all the ignition wires are properly connected and that you can't see any cracks in the wires. If the wires are cracked, they should be replaced. If you're still not getting spark, it's time to consult a repair manual or call a mechanic.

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    If you've got fuel and spark, ascertain that your bike is getting enough air. Start by pulling off the air filter. If it's too dirty, you won't get the proper mixture of air and fuel in the carburetor or injection system. If it's clean, check to see that the air box is properly connected-- a loose hose or air leak can feed too much air into the system. If your bike is equipped with a choke, ensure that it's able to move freely and is not stuck in the "on" or "off" position.

  • 5

    If you've followed these steps and still can't get your bike to run, call in an expert. If you think you've narrowed down the source of the problem, describe the steps you've taken to point the mechanic in the right direction.


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    I have a 2004 Suzuki LT-A400 Eiger ATV. It ran until the battery was replaced. Now there is no spark. I have experiance in repairing bikes and this one is stumping me. I have the factory service manual and...


    I suggest replacing the cap and rotor (check the inside of cap for wear on the "points"
    I am not expereinced with bikes, however when it comes to electrical/spark, I have always been able to find the issue, as there are only a few things that it can be. You have your power source (battery), your ground, and your source (any units/components powered by the battery). There aren't many things in between any of these that could be the issue.
    Also, check the wiring harness to the distributor. Make sure it is plugged in all the way (if it "plugs in"), if it's hard wired, the opposite end should have a connection. Check that as well. Make sure you have no wires bare, or touching the frame or other part of the bike, as this could be causing it to short out, which will limit or prevent spark.
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    Hello,

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