GSXR400 - GK73a - No spark even with new CDI.
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pobrika
- Settled in member
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- Joined: Wed Aug 02, 2023 6:42 pm
GSXR400 - GK73a - No spark even with new CDI.
Hi All,
I have a GSXR400 GK73A that is a project bike. I was told it was purchased as a parts bike parked up and left for 10 years. It was missing a CDI and front calipers so I purchased an Ignitech CDI and had it factory-calibrated. However, when attempting to start the bike there is no spark.
The bike turns over so it's not the kill switch or the kickstand. The bike came with a second set of coils and leads so I switched them out no difference.
I have tested the coils and there is power going to them measured as left 3.7 ohms / right 3.8 ohms
I took the coils off and stuck them on a 90's Transalp and saw a spark, albeit a bit weaker than the Transalp spark.
I took the Transalp coil and put it on the gsx and no spark. I'm hoping this proves it's not coils.
The pickup coil has a pulse measured at 5v not sure what I'm looking for here exactly.
I tested the CDI as best I could and there is power at both sides in and out. I also purchased another CDI however was sent one for the gk76a, not the 73 as requested, I wired it up to the bike anyway and it behaves in the same way as the new one but still no spark.
At this point, I am out of ideas about where to look next, my only thought is maybe trying to find a new/old pickup coil online.
Can anyone offer any ideas or explanation as to why even with power there is no spark? I hate to think it's related to the CDI as it cost a small fortune tbh but there is power going to and from it so I'm hopeful it's not that.
I have a GSXR400 GK73A that is a project bike. I was told it was purchased as a parts bike parked up and left for 10 years. It was missing a CDI and front calipers so I purchased an Ignitech CDI and had it factory-calibrated. However, when attempting to start the bike there is no spark.
The bike turns over so it's not the kill switch or the kickstand. The bike came with a second set of coils and leads so I switched them out no difference.
I have tested the coils and there is power going to them measured as left 3.7 ohms / right 3.8 ohms
I took the coils off and stuck them on a 90's Transalp and saw a spark, albeit a bit weaker than the Transalp spark.
I took the Transalp coil and put it on the gsx and no spark. I'm hoping this proves it's not coils.
The pickup coil has a pulse measured at 5v not sure what I'm looking for here exactly.
I tested the CDI as best I could and there is power at both sides in and out. I also purchased another CDI however was sent one for the gk76a, not the 73 as requested, I wired it up to the bike anyway and it behaves in the same way as the new one but still no spark.
At this point, I am out of ideas about where to look next, my only thought is maybe trying to find a new/old pickup coil online.
Can anyone offer any ideas or explanation as to why even with power there is no spark? I hate to think it's related to the CDI as it cost a small fortune tbh but there is power going to and from it so I'm hopeful it's not that.
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MadMotoUK
- Familiar Member
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- Joined: Tue Nov 24, 2020 12:53 pm
- Bike owned: FZR400,600, CBR893
Re: GSXR400 - GK73a - No spark even with new CDI.
You should have a constant 12v at the +ve terminal of the coil when measured with ignition on and second test probe to battery -ve. The CDI pulses the negative (0v) rail.
You won't be able to measure anything reliably output wise without an oscilloscpe.
You won't be able to measure anything reliably output wise without an oscilloscpe.