intermiten miss fire

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06 Aug 2011 22:22 #467344 by wcrider62
intermiten miss fire was created by wcrider62
starts missing and no power bogs down on hills and then runs perfect latley seems to run fine for about 2 miles then craps out.. you can pull the plug wire hold it close and hear the spark traveling across but no difference in the motor sound, still missing. checked every thing els could it be the ignighter
1982 kz1100 spectre D1

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  • TeK9iNe
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  • What did you do!?!
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06 Aug 2011 23:21 #467357 by TeK9iNe
Replied by TeK9iNe on topic intermiten miss fire
Yes, it could be the ignighter, it could also be the coils, wires, plug caps, plugs, leads from the pickups, the pickups themeseleves, advancer, and any wiring in between that makes up the ignition. :laugh:

Start at one end and good luck! - I would do plugs first... :P

B)
Motorcycle Shop Owner/Operator

79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors ;)

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07 Aug 2011 05:35 #467411 by bountyhunter
Replied by bountyhunter on topic intermiten miss fire
When mine had an intermittent miss, it was a flaky coil crapping out when it got hot.
1979 KZ-750 Twin

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07 Aug 2011 10:13 #467440 by Patton
Replied by Patton on topic intermiten miss fire
An internally frayed battery+ voltage wire in the last few inches before reaching the coil primary winding can be difficult to find, and may cause intermittent coil function.

When this occurs, the external appearance of the wire (usually red or red/yellow) often looks just fine.

Diagnosis may be aided by wiggling/manipulating the suspected wire while the engine's running, or using an ohmmeter with the ignition switch OFF.

Good Fortune! :)
1973 Z1
KZ900 LTD

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07 Aug 2011 11:15 #467448 by roy-b-boy-b
Replied by roy-b-boy-b on topic intermiten miss fire
I would guess your valve clearance is too tight if this problem starts after the engine warms up. Roy
1979 LTD Street Fighter.1977 KZ1000

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07 Aug 2011 16:37 #467519 by uncledirt
Replied by uncledirt on topic intermiten miss fire

bountyhunter wrote: When mine had an intermittent miss, it was a flaky coil crapping out when it got hot.


What was the matter? What did it look and what did you do? I'm getting a small issue like the other guy and I'm starting to investigate. My plugs are new though. My issue is when the bike is hot too. 1st gear only when starting out.
77 KZ650 'C'

Bachelors know more about women than married men; if they didn't they'd be married too.

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07 Aug 2011 16:41 - 07 Aug 2011 16:42 #467520 by Patton
Replied by Patton on topic intermiten miss fire
The reported issue may result from something as simple as a low or weak battery, or imperfect battery cable connections.

Good Fortune! :)
1973 Z1
KZ900 LTD
Last edit: 07 Aug 2011 16:42 by Patton.

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07 Aug 2011 16:45 #467521 by bountyhunter
Replied by bountyhunter on topic intermiten miss fire

uncledirt wrote:

bountyhunter wrote: When mine had an intermittent miss, it was a flaky coil crapping out when it got hot.


What was the matter? What did it look and what did you do? I'm getting a small issue like the other guy and I'm starting to investigate. My plugs are new though. My issue is when the bike is hot too. 1st gear only when starting out.

first gear only is not the coil. The bad coil will misfire in any gear.
1979 KZ-750 Twin

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