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Dynatek Coils 10 Nov 2022 13:09 #876612

  • ShaneDude
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Ugh.

Took the carbs off, cleaned them and still pipes 3 and 4 are cold. Spark plug wires are new, as are the boots. 
I tested the dynacoil and got good readings. A friend said that coils can still fail even when you test them. Has this ever happened to anyone? Bike is a 1977 KZ650 Kawasaki.


 

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Dynatek Coils 10 Nov 2022 13:54 #876615

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One coil supplies plugs 1 and 4, the other supplies plugs 2 and 3 so unlikely to be both coils on one side only.
Are plugs 3 and 4 wet or dry after trying to start it? 

Z1000J2 somewhat modified!


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Last edit: by Warren3200gt.

Dynatek Coils 10 Nov 2022 14:02 #876616

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The plugs are dry. Could it be valves?

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Last edit: by ShaneDude.

Dynatek Coils 10 Nov 2022 14:10 #876617

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No, if the plugs are dry it's definately carbs. 
It ran before you parked it up for a few months and then didn't. Valves are mechanical so nothing has changed. 
Does it back fire when trying to start it? If it does are you sure you have not accidently put the plug caps on the wrong cylinders.

Z1000J2 somewhat modified!


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Dynatek Coils 10 Nov 2022 14:14 #876618

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No, if the plugs are dry it's definately carbs. 
It ran before you parked it up for a few months and then didn't. Valves are mechanical so nothing has changed. 
Does it back fire when trying to start it? If it does are you sure you have not accidently put the plug caps on the wrong cylinders.


 

Yes, it backfires when it first starts.

How it happened.

I took it on a long run in july, parked until october. Took it for a ride and could hear It wasnt getting full power. Pipes 1,2 3, were hot, but not 4. Checked plug 4 and it was covered in oil. changed it. Then the bike ran good for 2 miles. Parked it. Started it 2 days later,  really started running poorly and then pipe 3 started running cold. Now it only runs on 1 and 2.

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Last edit: by ShaneDude.

Dynatek Coils 10 Nov 2022 14:24 #876619

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If it ran when you changed the plugs then that's where the issue is likely to lie.
DO NOT buy plugs from ebay or amazon as there are many fakes which are a total waste of money. 
Only use plugs from a known quality supplier. Most fakes are ngk but denso plugs are faked also but not as much.
Try swopping plug 4 with plug 1 and plug 2  with plug 3 and see if the problem moves with the plugs or remains with the cylinders. 

Z1000J2 somewhat modified!


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Last edit: by Warren3200gt.

Dynatek Coils 10 Nov 2022 14:53 #876621

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No eBay APP ID and/or Cert ID defined in Kunena configuration
If the plug oiled whilst stood it's likely the valve stem seals.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL MIKUNI CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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Dynatek Coils 10 Nov 2022 15:02 #876622

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If the plug oiled whilst stood it's likely the valve stem seals.
 
that would cause backfiring? the plugs arent oily anymore

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Dynatek Coils 10 Nov 2022 23:22 #876639

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If the plug oiled whilst stood it's likely the valve stem seals.

 
that would cause backfiring? the plugs arent oily anymore
Yes! It causes plug fouling which leads to intermittent firing or no firing at all until either the engine gets hot or you clean or change the plug which you say you did.
Even once the oil has burnt off it can leave oil varnishing on the center electrodes porceline which will allow the spark to track to earth at low rpms rather than jump the gap.
Also unburnt fuel from a misfiring cylinder builds up in the exhaust and is then ignited by by outgoing combustion from another which will cause banging from the exhaust.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL MIKUNI CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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Dynatek Coils 11 Nov 2022 04:23 #876640

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CTD!!!
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Dynatek Coils 19 Nov 2022 06:26 #876967

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Reading this and many other post i have to say again as i have before,the knowledge on this forum is outstanding.You guys are great!! Hence the reason im a sustaining member for life. 
77 ltd1000 80 ltd1000 78kz1000a ,02 red zrx 12r, 94 cb1000 big one ,03 valkyrie (my couch) 65 olds 442
The following user(s) said Thank You: SWest

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