Running issue 1979 kz650

  • Devin7717
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Running issue 1979 kz650

16 Aug 2015 19:33
#686020
I took my kz650 out today for the first time, it ran and rode very well then I took it on the interstate, hit 5th gear doing about 65, then I started hearing what seemed (through my full face helmet) like a highish pitched hum and it stopped accelerating, then when I got to my off ramp and down shifted it died. When I restarted it it would start and then if I gave it throttle it would make an odd sound and die. Eventually got it going then got almost to my destination and it did the same thing this time I was doing town speeds (35mph) then later we tried riding it to a mc mechanic and it died halfway there and took 20 mins to start butnit wouldnt ride. When we pulled the plug it was dry but there was fuel in all the bowls
1979 Kz650 SR

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  • DGA
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Re: Running issue 1979 kz650

16 Aug 2015 19:59
#686028
Does it have oil in it? Riding hard when it made the noise?
"83 KZ1100 Spectre, '81 Yamaha XV750 Cafe, '74 Kawasaki H2B 750

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Re: Running issue 1979 kz650

16 Aug 2015 20:01
#686029
It has oil and I wasnt running it hard
1979 Kz650 SR

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Re: Running issue 1979 kz650

16 Aug 2015 20:16
#686031
Maybe do a compression test. Also try taking the RH ignition cover off and turn the motor over by hand, see if it feels smooth and does not make similar type noises. Could also pull the oil filter and look for signs of metal in it, drain the oil too and look there.
"83 KZ1100 Spectre, '81 Yamaha XV750 Cafe, '74 Kawasaki H2B 750

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Re: Running issue 1979 kz650

17 Aug 2015 19:52
#686160
I took it to a mc mechanic and he mentioned cam chain guides
1979 Kz650 SR

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Re: Running issue 1979 kz650

18 Aug 2015 04:52
#686186
Devin7717 wrote: I took my kz650 out today for the first time, it ran and rode very well then I took it on the interstate, hit 5th gear doing about 65, then I started hearing what seemed (through my full face helmet) like a highish pitched hum and it stopped accelerating, then when I got to my off ramp and down shifted it died. When I restarted it it would start and then if I gave it throttle it would make an odd sound and die. Eventually got it going then got almost to my destination and it did the same thing this time I was doing town speeds (35mph) then later we tried riding it to a mc mechanic and it died halfway there and took 20 mins to start butnit wouldnt ride. When we pulled the plug it was dry but there was fuel in all the bowls
Try running with the fuel cap cracked loose.
Bill
www.KZ1300.com
Riders:
1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 2000 Honda Valkyrie, 2009 Yamaha Roadliner S. 1983 Honda GL 1100
Projects:
1985 ZN1300

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  • martin_csr
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Re: Running issue 1979 kz650

18 Aug 2015 07:31
#686202
Make sure the battery is good --- test it with a digital multimeter. Even if new, check it.
If a wet cell battery, make sure the electrolyte levels are correct --- only add distilled water if necessary.

Check the ignition coils for cracks or damage. If original, they may need replacing. A simple check is to ride the bike at highway speeds if possible, then stop & feel the coils, press hard with your fingers --- they should be warm, not hot. Hot indicates internal shorts or something.
1981 KZ650 Competition Sports and Road

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Re: Running issue 1979 kz650

07 Sep 2015 06:27
#688962
I got the call from the mechanic yesterday. It was just bad vacuum. The diaphram had been taken apart and reassembled wrong, as a result I wasnt getting fuel.
1979 Kz650 SR

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