Spark issue

DriverTJ · 02-15-2020, 05:14 PM

Ok buckle in this is a long one.
2001 Suzuki GZ250

I bought this bike from a friend, who told me he was riding the bike and it died on him. He thought it was the ignition, so he bought a OEM replacement. Turns out that ignition wasn’t the correct one. So he started messing with the wires trying to Hotwire it, couldn’t get it to spark. He then then sold the bike to me.

I get the bike, won’t crank, replace the ignition with the correct OEM ignition. Cranks but Still no spark.
I did a volt tester on the ignition coil, it seemed to be ok, alittle weak but ok. I bought a new CDI because he burnt up the old one trying to Hotwire the previous ignition. Still no spark.
I figured it must be the ignition coil, bought a replacement, still no spark.

That’s it game time, I unwrapped all the wires, started looking for frayed or cut wires. Didn’t find any, so I got the wiring diagram online. Started tracing every single wire to make sure it’s correct, looks to be correct but still no spark. One of the wires orange and white has constant power, which it didn’t before replacing the CDI but still I think it’s a problem with the white wire.

I’ve spent 6 months trying to figure this out, I’d perfer not taking it to a mechanic, so I’m reaching out here for my last Hope before I hand it over to the mechanics.

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Vegas Street Rider · 02-16-2020, 11:22 AM

Have you checked continuity through the kill switch?

DriverTJ · 02-16-2020, 11:41 AM

Quote:

Originally Posted by Vegas Street Rider

Have you checked continuity through the kill switch?

Yes the starter button was slightly dirty so I cleaned it up, but still getting good contact. Could it be a generator issue?

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5th_bike · 02-17-2020, 06:14 PM

Assuming you tried a new spark plug?..

Donald McPherson · 02-22-2020, 07:57 AM

Take the spark plug out. A bit drastic but won't kill you. Unless you have a heart problem.

Keep it connected to the cable, hold the bare end of the plug and turn over the engine. This will give you an idea of how much power is going to the spark.

Roadking · 03-10-2020, 11:16 AM

Ok these bikes have anti theft built in to the circuits thru resistance diodes. If the one circuit don't read the correct voltage drop it wont complete the start circuit. It prevents hotwiring the ignition.

I had a no spark issue with my 1st 99 GZ 250. bought it not running. Replaced the kickstand switch and it started. Mind you the switch must be grounded/bolted to the frame. I figured that out the hard way.

Good luck
RK

wacio · 03-14-2020, 11:16 PM

Yes, check side stand switch - common problem. Another possibility not mentioned - crank position sensor. Also - check power at the ignition coil - should be 12V after ignition key is in ON position.

02-15-2020, 05:14 PM	#1
DriverTJ Junior Member Join Date: Feb 2020 Posts: 2	Spark issue Ok buckle in this is a long one. 2001 Suzuki GZ250 I bought this bike from a friend, who told me he was riding the bike and it died on him. He thought it was the ignition, so he bought a OEM replacement. Turns out that ignition wasn’t the correct one. So he started messing with the wires trying to Hotwire it, couldn’t get it to spark. He then then sold the bike to me. I get the bike, won’t crank, replace the ignition with the correct OEM ignition. Cranks but Still no spark. I did a volt tester on the ignition coil, it seemed to be ok, alittle weak but ok. I bought a new CDI because he burnt up the old one trying to Hotwire the previous ignition. Still no spark. I figured it must be the ignition coil, bought a replacement, still no spark. That’s it game time, I unwrapped all the wires, started looking for frayed or cut wires. Didn’t find any, so I got the wiring diagram online. Started tracing every single wire to make sure it’s correct, looks to be correct but still no spark. One of the wires orange and white has constant power, which it didn’t before replacing the CDI but still I think it’s a problem with the white wire. I’ve spent 6 months trying to figure this out, I’d perfer not taking it to a mechanic, so I’m reaching out here for my last Hope before I hand it over to the mechanics. Sent from my iPhone using Tapatalk Login or Register to Remove Ads
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02-17-2020, 06:14 PM	#4
5th_bike Senior Member Join Date: Oct 2007 Location: HoCo, Maryland Posts: 1,349	Assuming you tried a new spark plug?.. __________________ 2005 "Saturn Black", stock + tach
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02-22-2020, 07:57 AM	#5
Donald McPherson Member Join Date: Aug 2018 Location: Aberdeen Scotland Posts: 47	Take the spark plug out. A bit drastic but won't kill you. Unless you have a heart problem. Keep it connected to the cable, hold the bare end of the plug and turn over the engine. This will give you an idea of how much power is going to the spark. Login or Register to Remove Ads
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02-16-2020, 11:22 AM	#2
Vegas Street Rider Senior Member Join Date: May 2015 Location: Henderson, NV Posts: 1,089	Have you checked continuity through the kill switch?
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03-10-2020, 11:16 AM	#6
Roadking Member Join Date: Apr 2017 Location: South of Atlanta Posts: 50	Ok these bikes have anti theft built in to the circuits thru resistance diodes. If the one circuit don't read the correct voltage drop it wont complete the start circuit. It prevents hotwiring the ignition. I had a no spark issue with my 1st 99 GZ 250. bought it not running. Replaced the kickstand switch and it started. Mind you the switch must be grounded/bolted to the frame. I figured that out the hard way. Good luck RK
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03-14-2020, 11:16 PM	#7
wacio Senior Member Join Date: Apr 2016 Location: Illinois Posts: 174	Yes, check side stand switch - common problem. Another possibility not mentioned - crank position sensor. Also - check power at the ignition coil - should be 12V after ignition key is in ON position.
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