1980 kz cyl 2-3 quit after 10 min riding

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1980 kz cyl 2-3 quit after 10 min riding

30 Aug 2015 14:41
#687885
I got my carb jetting in order, ,a still have to go a couple more sizes up, but after riding for abt 10 min it started cutting in and out real bad. Then it almost didn't make it home, when I got home center 2 pipe cyl 2 n 3 were 100 degrees, not firing, has accel coils idk how old they r and electronic ignition on the bike too

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Re: 1980 kz cyl 2-3 quit after 10 min riding

30 Aug 2015 14:55
#687887
Check & clean the connections on your coil going to the 2-3 cylinders, & see if that clears things up, if the coils are old, it could be a bad coil
Pete
1980 LTD 1000..,1976 LTD 900, have the 1000&900 now. the rest are previous= 1978 KZ 650 B.., 1980 Yamaha XT 500..,1978 Yamaha DT 400.., 1977 Yamaha yz 80..,Honda trail ct 70.., Honda QA 50...5-1/2 hp brigs & straton CAT chopper mini bike...3-1/2 hp mini bike (WHEN GAS WAS ABOUT 45 CENTS A GALLON)!!!!

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Re: 1980 kz cyl 2-3 quit after 10 min riding

30 Aug 2015 16:05
#687906
Can the coils be swapped? Then I can see if the cylinders follow...

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Re: 1980 kz cyl 2-3 quit after 10 min riding

30 Aug 2015 16:10
#687910
Yes, if the spark plug wires are long enough. Swapping them means not just the spark plug wires but also the wires from the ignition module that fires the coils. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Re: 1980 kz cyl 2-3 quit after 10 min riding

30 Aug 2015 17:48
#687935
So I went ahead cleaned connections and swapped coils from one side to the other rode it abt 20 min pretty hard and it wouldn't act up like it did before... few misses here and there but that's abt it., I did notice some connections that had almost like a clear rubber protector around it with connectors I that, idk why those are on there really... tm I'm going to bring my meter home and ohm out the coils and see what voltage is at battery compared to the coils. I just don't want to keep dumping money into it

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Re: 1980 kz cyl 2-3 quit after 10 min riding

01 Sep 2015 09:24
#688175
Turbo99397 wrote: ... electronic ignition on the bike too

Sounds like a good reason to check all the connections from the battery through the ignition system, Also look up the install spec on the electronic ignition and makes sure it is in the right position (some install in the full advance position). Heat is getting to something if the problem doesn't show up right after starting. Check coils, wires, plug caps for cracks.

With 2-3 going cold it's a week coil, but you switched it and found better running. Check your compression, there might be a valve seal leak of something else happening there. have you checked your valve/shim clearances?
'79 KZ650B3 (stock)
'79 KZ650B3 (parts bike)
'06 HD 883R

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Re: 1980 kz cyl 2-3 quit after 10 min riding

05 Sep 2015 07:57
#688734
Update. Runs exactly same with coils swapped. 2 and 3 goes out. Plugs r wet. Idk if it's ign or fuel related.

Attachment 20150904_204351-2.jpg not found


That's what the plugs looked like. I have 12.5 at battery and 11.4 at coils tho.

Attachments:

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Re: 1980 kz cyl 2-3 quit after 10 min riding

05 Sep 2015 08:00
#688736
LineArtist wrote:
Turbo99397 wrote: ... electronic ignition on the bike too

Sounds like a good reason to check all the connections from the battery through the ignition system, Also look up the install spec on the electronic ignition and makes sure it is in the right position (some install in the full advance position). Heat is getting to something if the problem doesn't show up right after starting. Check coils, wires, plug caps for cracks.

With 2-3 going cold it's a week coil, but you switched it and found better running. Check your compression, there might be a valve seal leak of something else happening there. have you checked your valve/shim clearances?

I have not checked valve clearance. I don't have a new valve cover gasket so I didn't attempt pulling it off

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Re: 1980 kz cyl 2-3 quit after 10 min riding

05 Sep 2015 08:02
#688737
Points? Valves adjusted?
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Re: 1980 kz cyl 2-3 quit after 10 min riding

05 Sep 2015 08:09
#688739
Electronic ign

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Re: 1980 kz cyl 2-3 quit after 10 min riding

05 Sep 2015 10:56
#688761
11.4 vdc at the coil is quite a drop. I doubt if that is the whole explanation, but it does need to be addressed. Every connector between the battery and the sparkplugs need some careful attention. A can of Deoxit and some small brass brushes will clean them right up and will help insure full voltage to the coils.
Valve lash, intake leaks and carb settings will still need checking, but no matter what, the coils need full voltage.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24

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Re: 1980 kz cyl 2-3 quit after 10 min riding

05 Sep 2015 14:33
#688782
Turbo99397 wrote:
LineArtist wrote:
Turbo99397 wrote: ... electronic ignition on the bike too

Sounds like a good reason to check all the connections from the battery through the ignition system, Also look up the install spec on the electronic ignition and makes sure it is in the right position (some install in the full advance position). Heat is getting to something if the problem doesn't show up right after starting. Check coils, wires, plug caps for cracks.

With 2-3 going cold it's a week coil, but you switched it and found better running. Check your compression, there might be a valve seal leak of something else happening there. have you checked your valve/shim clearances?

I have not checked valve clearance. I don't have a new valve cover gasket so I didn't attempt pulling it off

If your very careful tapping on the the valve cover you might get it off and get away without replacing the cover gasket ....... I removed mine quite a few times to paint it and check the lash before I replaced it after the work I had done ...... More than a few others have done this too on here.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.

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