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Carb setting and point specs for 1979 KZ750 LTD twin.

11630 Views 12 Replies 5 Participants Last post by  Alizard, 
S
Bought it from a buddy who bought it but never messed with it until i bought it from him. would't fire, he cleaned points, but not sure if they are set correct. would only run on 1 cylinder, took other carb off and float was siezed closed. He cleaned both carbs put them on I brought it home and it runs..but at low idle it misses, as soon as I get into the throttle both cylinders come to life. I cruised it up and down the alley a few times and it seems to have lots of Jam going through the gears. Just at low idle that **** miss, it wont idle without assistance on the throttle.(unless I turn the idle screw up/in).

I have not checked the compression yet, I will I just forgot to take my compression tester over to my bro's (its actually at his place).

Anyways I was wondering if anyone can give me any pointers or the settings for carbs and points. Also am having trouble finding service manual for this model.

Thanks to all!
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As far as setting the carbs - you should find 3 screw adjustments.

One - for 1 and 2 usually left side of bike

a middle adjustment that is for setting each side equal for 1/2 and 3/4

Rt side for carbs 3/4

If you are good at it you can eyeball the adjustment, but I'm not big on that and purchased a carbtuner II www.carbtune.com I got my carbs tuned in 20 minutes the first time I did it. It's that simple.

There are less expensive options like from Motion Pro, but they have Mercury in them. I elected to go with a non - mercury system because I have a young one at homeand all of the high recommendations the carbtuner got from local riders and motorcycle magazines. Motion Pro is available at most shops and on-line as well. Check with our sponsor to support them if you decide to buy a Motion Pro.
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Welcome to the board and glad I could give you a hand
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What is your pilot screw set on the carbs? 1, 1.5, 2, 3 turns out?
Take one of the pilot screws and screw it clockwise to close - do not overtighten and count how many times the flathead screwdriver turns fully.

Turn the pilot screw back out the same amount and do 1/4 extra until you no longer run rough. Make sure the other pilots screws match.

Try doing a quarter turn out on each carb and see if that helps.
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If you are overflowing it sounds like your float needle need a thorough cleaning or just replace it. If/when you take the carbs off your bike again, drain the gas and flip the carb upside down and take off the cover so you can see the floats. When the float touches the needle - does the needle move freely? I would check the float height at this point as well.
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The only other thing I can think of is that you have a vacuum leak still somewhere or a blockage.
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