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Poor starting, bad idle, poor running 10 years 5 months ago #210

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I have had my '80 1300A since new "0" miles. It has been a love/hate relationship dealing with the invisible goblins. As far as starting/idling problems go I now believe that if all electrical/ignition checks-out, the fuel-line system is simplified, and there are no air/vacuum leaks, the float levels are correct ( assuming the floats actually float), and you are still having starting/idling problems it is because the carbs are not clean. I spent many years being frustrated with these issues and have come to one conclusion ( now that I have her starting/running precisely and without fault)......the carbs were NOT clean!!!. In my opinion these carbs are not complex per-say. However if you study them closely they have a network of fuel galleries cast into them to get the idle/low-end fuel to the throttle-bore. Leaving fuel to stand for any significant time guarantees these tiny galleries will varnish and plug. "Cleaning" the carbs does not guarantee the carbs are clean. If you are 100% certain every other condition is perfect and you are continuing to have problems, then remove the carbs and clean them again. From my personal experience I had to do this no less then 6 times before I final got the "crap" removed from the idle circuits. Carb cleaner, lacquer-thinners, solvents of every type, ( I did not have access to ultra-sonic), enough compressed air to supply a planet with an atmosphere - the final solution was to BOIL them. No less then 3X for 30 minutes and with a lot of compressed air ! Unfortunately you will have no way of knowing of your success until it's all back together and it runs or it doesn't. I will also suggest that the Idle/choke adjustment will take some patience getting just right. ( I have mine adjusted so that the bike with start and idle with no choke on a warm day / add a little as required for the chillier days. Within 60 secs or less the choke can be reduced/removed.) I have a DG exhaust and I have not "re-jetted". I simply made my adjustments using the stock needle set for the best plug/exhaust color. The final reward is worth it ! Tech note: Do NOT use your wife's good "soup-pot" to boil the carbs !

NOTE: The seals on the throttle shaft ends could be damaged if soaked excessively in strong cleaners such as lacquer-thinner. The use of lacquer-thinner for manual surface cleaning and gallery flushing using a syringe is OK.
1980 KZ 1300 sr# KZT30A-009997
Always High - Know Fear !

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Poor starting, bad idle, poor running 10 years 5 months ago #211

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Scotch,
Great post that & some handy tips too.
I am fanatical about Z1300 carbs (know them inside out) & like you have tried many ways to ensure all those tiny fuel & air channels inside are clear.

Many years ago I took a Z1300 carb body that was damaged & cut it up with a small dremel & cutter to see EXACTLY what is inside & how it blocks..........it was a very worthwhile process as it confirmed the channels are very, very small, in particular the ones in the primary circuit.
I then left the cut up pieces & my 3 good bodies in a bath of diesel for a few weeks moving them around every other day or so & it was amazing how it cleaned all the insides & offending pipes & airways. Diesel is a great cleaner & full or detergents but does not spoil aluminum.
I always give them a good blast through with a 100psi line with pointed nozzle before re-assembly.
Like you now I have a Z1300 that I can set up with a Color Tune Plug & Vacuum Gauges to a perfect result & make it idle at 750-800 rpm if I want. It will also pull from 25-30 mph in top gear to well over 100mph without any hesitation at all.
Pete
Why Have Four When You Can Have Six ?
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Poor starting, bad idle, poor running 9 years 7 months ago #4050

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pete

were youre carbs free of all gaskets and jets when you did this, i.e stripped completely?
Tad

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Poor starting, bad idle, poor running 9 years 7 months ago #4054

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Yes ! The only parts left in the carb bodies were the Throttle-shafts and plates. Don't mess with these !!! They are not critical to the cleaning.

NOTE: The seals on the throttle shaft ends could be damaged if soaked excessively in strong cleaners such as lacquer-thinner. The use of lacquer-thinner for manual surface cleaning and gallery flushing using a syringe is OK.
1980 KZ 1300 sr# KZT30A-009997
Always High - Know Fear !

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Last edit: by scotch.

Poor starting, bad idle, poor running 7 years 7 months ago #13809

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Hello.
I am in need of a set of floats. Are they available.?
Regards Steve.

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Poor starting, bad idle, poor running 7 years 7 months ago #13811

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One set left P.M. me.
1980 KZ 1300 sr# KZT30A-009997
Always High - Know Fear !

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