Eton 70 Viper minni 4 stoke (no spark)
Oct 3, 2010 | 09:21 AM
#1
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Weekend Warrior
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Eton 70 Viper minni 4 stoke (no spark)
Hi everyone. I have been reading your fourm for some time now but havent posted any, so relativly new here. Im having an issue with my Eton 70. I have spark when you first pull the start trigger and when you release the trigger, but NO Spark while it is turning over. ??? So if it doent start on the first couple revs. or when you release the trigger it floods and you need to pull the plug and clean it out. Then it will usally fire right off on the first rev or two. Anyone have any thoughts on this? Thanks for any help. Tom
Oct 5, 2010 | 12:06 AM
#2
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From: Tracy, California, USA
Tom,
I've never seen an Eton 70. I need to say that off the bat, but nobody else is responding so I'll give it my best.
I suspect the problem is with the CDI timing / trigger signal from the stator to the CDI. The reason for this is that you do get spark, and there are huge transient voltages generated when the starter is engaged and disengaged. If you don't have a normal trigger signal then you won't get spark when the starter is turning at normal and steady cranking speed, but when first engaged or disengaged the transient spikes may induce some erroneous triggers, especially if the trigger input wire is disconnected.
According to the wiring diagram at www.anythingatv.com the trigger from the stator goes through the remote start up module to the CDI. Do you have a remote module? Does it work normally?
Do you have a meter? I'd measure the AC voltage at the CDI trigger pin while cranking the starter. You should see 0.2 volts to 0.4 volts AC at cranking speeds.
Flooding the engine does not keep spark from happening. But keep in mind that the trigger voltage is really low at cranking speeds, and increases proportionally with engine speed. So if the engine catches, and speeds up a bit, the trigger voltage will increase and cause more spark. Then off it goes feeding back on itself and the quad starts up. At idle the quad is running 2.5 times as fast as when cranking - that is a huge difference. If you are on the threshold of the CDI getting triggered or not trigggered (at cranking speeds) you could experience this type of trouble.
Another data point: Try jumping the quad to your car running at a high idle. The car will raise your quad battery voltage to 14 volts or so and make your quad crank a little faster. Does it start better? This would be a major clue.
Also, Eton quads have an adjustable gap between the trigger pickup coil outside the stator and the flywheel. This adjustment will drastically affect the trigger voltage at cranking speeds. There used to be an adjustment procedure on the anythingatv.com site. It may still be there. As I recall the gap should be 0.025" between the flywheel's *raised bump* and the pickup coil outside the flywheel. Also make sure there is no magnetic debris stuck to the magnet that is embedded in the trigger pickup coil.
Lynn
I've never seen an Eton 70. I need to say that off the bat, but nobody else is responding so I'll give it my best.
I suspect the problem is with the CDI timing / trigger signal from the stator to the CDI. The reason for this is that you do get spark, and there are huge transient voltages generated when the starter is engaged and disengaged. If you don't have a normal trigger signal then you won't get spark when the starter is turning at normal and steady cranking speed, but when first engaged or disengaged the transient spikes may induce some erroneous triggers, especially if the trigger input wire is disconnected.
According to the wiring diagram at www.anythingatv.com the trigger from the stator goes through the remote start up module to the CDI. Do you have a remote module? Does it work normally?
Do you have a meter? I'd measure the AC voltage at the CDI trigger pin while cranking the starter. You should see 0.2 volts to 0.4 volts AC at cranking speeds.
Flooding the engine does not keep spark from happening. But keep in mind that the trigger voltage is really low at cranking speeds, and increases proportionally with engine speed. So if the engine catches, and speeds up a bit, the trigger voltage will increase and cause more spark. Then off it goes feeding back on itself and the quad starts up. At idle the quad is running 2.5 times as fast as when cranking - that is a huge difference. If you are on the threshold of the CDI getting triggered or not trigggered (at cranking speeds) you could experience this type of trouble.
Another data point: Try jumping the quad to your car running at a high idle. The car will raise your quad battery voltage to 14 volts or so and make your quad crank a little faster. Does it start better? This would be a major clue.
Also, Eton quads have an adjustable gap between the trigger pickup coil outside the stator and the flywheel. This adjustment will drastically affect the trigger voltage at cranking speeds. There used to be an adjustment procedure on the anythingatv.com site. It may still be there. As I recall the gap should be 0.025" between the flywheel's *raised bump* and the pickup coil outside the flywheel. Also make sure there is no magnetic debris stuck to the magnet that is embedded in the trigger pickup coil.
Lynn
Oct 5, 2010 | 09:11 PM
#3
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Weekend Warrior
Joined: Feb 2006
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Lynn, Thanks for your advice. You have given me alot of good info. Now I just hope Im smart enough to make it work for me. Yes it does have the remote modual. I dont use it so I dont know if it work like it should or not. I will check it. Yes I do have a meter. I will check into these things and let you know what I come up with. Thanks for your help. Tom
Tom,
I've never seen an Eton 70. I need to say that off the bat, but nobody else is responding so I'll give it my best.
I suspect the problem is with the CDI timing / trigger signal from the stator to the CDI. The reason for this is that you do get spark, and there are huge transient voltages generated when the starter is engaged and disengaged. If you don't have a normal trigger signal then you won't get spark when the starter is turning at normal and steady cranking speed, but when first engaged or disengaged the transient spikes may induce some erroneous triggers, especially if the trigger input wire is disconnected.
According to the wiring diagram at www.anythingatv.com the trigger from the stator goes through the remote start up module to the CDI. Do you have a remote module? Does it work normally?
Do you have a meter? I'd measure the AC voltage at the CDI trigger pin while cranking the starter. You should see 0.2 volts to 0.4 volts AC at cranking speeds.
Flooding the engine does not keep spark from happening. But keep in mind that the trigger voltage is really low at cranking speeds, and increases proportionally with engine speed. So if the engine catches, and speeds up a bit, the trigger voltage will increase and cause more spark. Then off it goes feeding back on itself and the quad starts up. At idle the quad is running 2.5 times as fast as when cranking - that is a huge difference. If you are on the threshold of the CDI getting triggered or not trigggered (at cranking speeds) you could experience this type of trouble.
Another data point: Try jumping the quad to your car running at a high idle. The car will raise your quad battery voltage to 14 volts or so and make your quad crank a little faster. Does it start better? This would be a major clue.
Also, Eton quads have an adjustable gap between the trigger pickup coil outside the stator and the flywheel. This adjustment will drastically affect the trigger voltage at cranking speeds. There used to be an adjustment procedure on the anythingatv.com site. It may still be there. As I recall the gap should be 0.025" between the flywheel's *raised bump* and the pickup coil outside the flywheel. Also make sure there is no magnetic debris stuck to the magnet that is embedded in the trigger pickup coil.
Lynn
I've never seen an Eton 70. I need to say that off the bat, but nobody else is responding so I'll give it my best.
I suspect the problem is with the CDI timing / trigger signal from the stator to the CDI. The reason for this is that you do get spark, and there are huge transient voltages generated when the starter is engaged and disengaged. If you don't have a normal trigger signal then you won't get spark when the starter is turning at normal and steady cranking speed, but when first engaged or disengaged the transient spikes may induce some erroneous triggers, especially if the trigger input wire is disconnected.
According to the wiring diagram at www.anythingatv.com the trigger from the stator goes through the remote start up module to the CDI. Do you have a remote module? Does it work normally?
Do you have a meter? I'd measure the AC voltage at the CDI trigger pin while cranking the starter. You should see 0.2 volts to 0.4 volts AC at cranking speeds.
Flooding the engine does not keep spark from happening. But keep in mind that the trigger voltage is really low at cranking speeds, and increases proportionally with engine speed. So if the engine catches, and speeds up a bit, the trigger voltage will increase and cause more spark. Then off it goes feeding back on itself and the quad starts up. At idle the quad is running 2.5 times as fast as when cranking - that is a huge difference. If you are on the threshold of the CDI getting triggered or not trigggered (at cranking speeds) you could experience this type of trouble.
Another data point: Try jumping the quad to your car running at a high idle. The car will raise your quad battery voltage to 14 volts or so and make your quad crank a little faster. Does it start better? This would be a major clue.
Also, Eton quads have an adjustable gap between the trigger pickup coil outside the stator and the flywheel. This adjustment will drastically affect the trigger voltage at cranking speeds. There used to be an adjustment procedure on the anythingatv.com site. It may still be there. As I recall the gap should be 0.025" between the flywheel's *raised bump* and the pickup coil outside the flywheel. Also make sure there is no magnetic debris stuck to the magnet that is embedded in the trigger pickup coil.
Lynn
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