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Author Topic: Good spark but wont start  (Read 1101 times)

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Offline DaSchwartz

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Good spark but wont start
« on: May 30, 2017, 03:30:51 PM »
Sup folks! my girl sparking good again. Yay! now she just turns over and over and backfires after after a few cranks. Won't start.... and yes i have fuel and the kill switch is on run.... any suggestions? Thanks!  Ken
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Offline Jimray23

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Re: Good spark but wont start
« Reply #1 on: May 30, 2017, 03:38:19 PM »
Well it takes 3 things for a gas motor to run.
1. The correct air/fuel ratio
2. Compression
3. Correct timing
I would check compression and timing to make sure those are good. If those are good its got to be fuel.

--------------------------------------------------
Jim
1979 kz1000b ltd
    stage 3 cams
    pod air filters
    4-1 open exhaust(no muffler)
    full rewire
    dyna-s ignition
    dyna 3 ohm coils

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Offline atm cycles

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Re: Good spark but wont start
« Reply #2 on: May 30, 2017, 03:38:34 PM »
Coils wired correctly. Timing?   If you have spark, fuel and compression it much else but spark not at the right time
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Offline Ridem32

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Re: Good spark but wont start
« Reply #3 on: May 30, 2017, 03:39:07 PM »
Timing may be off


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Offline zerodaydave

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Re: Good spark but wont start
« Reply #4 on: May 30, 2017, 03:46:55 PM »
I had this problem with one of my bikes. Compression was good so I checked the timing. That was the culprit.

As others have said: Spark, Compression, Fuel.

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Offline Jimray23

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Re: Good spark but wont start
« Reply #5 on: May 30, 2017, 03:50:08 PM »
When you had spark problems, what did u have to replace?

--------------------------------------------------
Jim
1979 kz1000b ltd
    stage 3 cams
    pod air filters
    4-1 open exhaust(no muffler)
    full rewire
    dyna-s ignition
    dyna 3 ohm coils

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Offline TwoTired

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Re: Good spark but wont start
« Reply #6 on: May 30, 2017, 05:34:33 PM »
What bike?
And did you dismantle the spark advancer?
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Offline DaSchwartz

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Re: Good spark but wont start
« Reply #7 on: May 31, 2017, 07:05:19 PM »
howdy y'all!Timing is perfect, however, i just learned about the starter clutch today! had no idea such a thing existed. yet mine has apparently failed! Yay! I just happen have the repair kit. Wish me luck!
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Offline fatmatt650

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Re: Good spark but wont start
« Reply #8 on: May 31, 2017, 07:14:43 PM »
What makes you think it's the starter clutch?
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Offline fatmatt650

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Re: Good spark but wont start
« Reply #9 on: May 31, 2017, 07:17:37 PM »
If it's starter clutch it should still kickstart I think?
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Offline DaSchwartz

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Re: Good spark but wont start
« Reply #10 on: June 01, 2017, 04:36:19 PM »
when i press the start button and rev it for 9 or 10 times, then release the start button, the motor stops cranking and the starter keeps spinning. has a very fast, like a dry, winding down sound for a second or two, then stops.
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Offline 63SSRagtop

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Re: Good spark but wont start
« Reply #11 on: June 01, 2017, 05:56:50 PM »
I had that problem with the 91 nighthawk and turns out I simply had the coil wires on the packs reversed fired up and scared the crap outta me.. lol
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Offline Jmed22

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Re: Good spark but wont start
« Reply #12 on: June 01, 2017, 06:15:01 PM »
Sounds like maybe the timing or low compression.

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Offline Jimray23

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Re: Good spark but wont start
« Reply #13 on: June 01, 2017, 06:48:51 PM »
You may need to pull the starter and clean it.

--------------------------------------------------
Jim
1979 kz1000b ltd
    stage 3 cams
    pod air filters
    4-1 open exhaust(no muffler)
    full rewire
    dyna-s ignition
    dyna 3 ohm coils

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