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Plugs fouling quickly, similar to Risccas post

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    #16
    24 mpg is very poor. I just recently helped a member who was also getting about 24 on his '78 1000. But it took a jet kit to achieve this.
    With your pods/pipe, correctly jetted, you can expect around mid-thirties city and 40+ on longer trips.
    You could still have other issues, especially a combination of issues, but with the info provided so far, I'd suspect the carbs. But like I said, the electrical has to be checked out as you're doing. No sense trying to re-jet with a poor/weak spark or incorrect timing.
    As for the carbs, you have no way of knowing what someone may have done to them. The floats could be way off, incorrect jet needle position, incorrect needle jet, worn jet needle(s), dirty carbs...
    I'm focusing on the pilot and needle circuits because I'm assuming your recent riding is basically just cruising around town and that would definitely be the pilot/needle circuits.
    I don't know your knowledge of taking carbs apart, but if you look up my past posts I'm sure you can get the info to work on them yourself. There's also a new VM carb section that's can help you do the work. I'm just not sure your mechanic is familiar with these carbs to do a good job. Like I said, if you're missing the jet needle spacers or they were re-installed wrong, your mileage would be terrible. Just one of many possibilities. If the mechanic isn't familiar with these carbs, you could go on forever without fixing them.
    Taking them apart to inspect the needles is mandatory. Since they'll be apart, clean them out and order the VM o-ring kit (cheap) from Robert Barr, a member here. Also order manifold o-rings and check manifolds. Adjust the floats...all this stuff. Verify the side air screws and pilot fuel screw operate right, etc. Do all this, ask questions and we can re-jet some carbs that we know are ready to re-jet.
    This may sound like a pain, but this is the best/quickest way to get the bike going good again and being a nice bike to ride around. Just takes a little cash and some work. If you don't wish to buy a carb tool ($40) and learn to vacuum synch (easy), then I hope the mechanic can do a good job. Vacuum synching is important to the re-jet and performance and getting accurate plug reads. Vacuum synching must be done after disturbing the jet needles/slides.
    I'm just passing on my experience and hoping you're providing correct info to help us troubleshoot your problem. Don't take short cuts. If the rest of the bike is in a decent tune condition, rebuild the carbs and save yourself frustration.
    And on the seventh day,after resting from all that he had done,God went for a ride on his GS!
    Upon seeing that it was good, he went out again on his ZX14! But just a little bit faster!

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      #17
      update

      About a week ago a Dyna electronic ignition and K&N pods were installed, still had issue with 3800-4000rpm range missing/cutting out. Today, new dyna coils and wires were installed along with Dyno jet stage three kit. After adjustments and syncing with the new morgan carbtune, the motorcyle ran perfectly at all rpm ranges up to about 75-80mph haven't had opportunity to check above that. So, it looks as if my tuning problems have been resolved for now. The main culprit was probably the needle jets, the new ones were set in the middle position.

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        #18
        OK. Thanks for the update.
        Not trying to cause you concern but be sure to do some 1/3 throttle chops and be sure the mixture is correct. You spend the most time riding around on the jet needle circuit and you don't want to be lean.
        My past experience with your model, K&N pods and the DJ kit suggests the needle E-clip should be in position 4 from the top. I don't know where you have them set but test and make sure they're right.
        The 138 main jet supplied is usually the better choice too.
        And on the seventh day,after resting from all that he had done,God went for a ride on his GS!
        Upon seeing that it was good, he went out again on his ZX14! But just a little bit faster!

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