1979 KZ 650 sr no start no spark

  • ejsimelaro
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1979 KZ 650 sr no start no spark

Today 06:02
#927337
 The bike sat over the winter.  Come May I started prepping the bike for riding I only have Saturday to work on the bike.  Installed fresh fully charged battery and some gas.   The bike cranks no start.  I started diagnosing the issue. pulled plugs and looked for spark.  Nothing.  I cleaned the points and tested them for resistance which was the 1st thing I did before doing or order anything  No spark, I pulled and bench tested the coils they are over 40 yo all original parts.  The Coils from what I could tell were out of spec I don't remember the numbers at this point in time. I am also learning as I go here. I bench tested what I can before I ordered replacement parts on everything I list here.   coils, condenser, spart plugs, still no spark, Again, trying to figure this out as I go.   So, I am apparently missing something as I have voltage at the coils.  Now I tried cranking the bike with the points cover open and I am not seeing a spark at the points when they open and close so I am assuming there is some issue before the points, but I do not know where.   I am trying to avoid replacing the points if I don't have to.  So anybody who knows more  then me have any idea where I can look next to see what the issue is.  A lose wire or maybe a short.  What would cause no spark if it was not the coils, condenser and spart plugs.   Thanks in advance!
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  • Wookie58
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Re: 1979 KZ 650 sr no start no spark

Today 07:15
#927341
 The bike sat over the winter.  Come May I started prepping the bike for riding I only have Saturday to work on the bike.  Installed fresh fully charged battery and some gas.   The bike cranks no start.  I started diagnosing the issue. pulled plugs and looked for spark.  Nothing.  I cleaned the points and tested them for resistance which was the 1st thing I did before doing or order anything  No spark, I pulled and bench tested the coils they are over 40 yo all original parts.  The Coils from what I could tell were out of spec I don't remember the numbers at this point in time. I am also learning as I go here. I bench tested what I can before I ordered replacement parts on everything I list here.   coils, condenser, spart plugs, still no spark, Again, trying to figure this out as I go.   So, I am apparently missing something as I have voltage at the coils.What is the voltage at the coils when cranking ?
  Now I tried cranking the bike with the points cover open and I am not seeing a spark at the points when they open and close so I am assuming there is some issue before the points, The condenser's only purpose is to reduce arcing at the points but I do not know where. 
 I am trying to avoid replacing the points if I don't have to.  So anybody who knows more  then me have any idea where I can look next to see what the issue is.  A lose wire or maybe a short.  What would cause no spark if it was not the coils, condenser and spart plugs.   Thanks in advance!  Pull one lead from each coil off the plugs (#3 & #4) put plugs in the leads and lay on the cyl head, switch on ignition, now open the points manually - do you get a spark each time you open the points

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  • Warren3200gt
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Re: 1979 KZ 650 sr no start no spark

Today 07:42
#927342
Has it got a clutch or sidestand lock out switch?

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  • F64
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Re: 1979 KZ 650 sr no start no spark

Today 08:13 - Today 08:14
#927343
Did it run last summer?
What have you done to the bike since it was parked?
How and where was the bike stored?
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Last edit: Today 08:14 by F64.

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  • gd4now
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Re: 1979 KZ 650 sr no start no spark

Today 08:31
#927344
Stock it would of come with a clutch lock out switch for power to reach the starter relay. He indicated the starter will turn the engine. So that does not play into the no spark issue.I would as Wookie indicated check for voltage to the coils, and test as he indicated, as it needs to be very near to full battery voltage for them to work correctly. He does indicate that he cleaned the points and installed new condensers though. If not installed correctly they can ground out power to the points. 
1977 KZ650 B1
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