No Spark, Engine Won't Start - Yamaha Rhino Forum - Rhino Forums.net
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post #1 of 11 (permalink) Old 07-14-2017, 11:09 AM Thread Starter
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No Spark, Engine Won't Start

I got a 2007 Rhino 660 recently. It has always had trouble starting when cold, but I changed the spark plug and the fuel filter and that seemed to help. Then, I was driving it and it just stalled out. I can still crank the starter and it sounds fine, but it will not catch. I pulled out the spark plug and tested the ignition - there is no spark. I replaced the ignition coil just because it was the easiest thing, but that didn't help.

I read on these forums that it might be the pick-up coil. It was a bit of effort to replace that thing (pick-up coil and stator are replaced as a unit), but everything is back together, along with a new water pump. There is still plenty of power left in the battery. It cranks, but it still won't start. When I work the throttle, I can hear the pitch of engine change. I am still pretty sure it is a problem with the spark, but what else is there in the ignition system that could be wrong?

Is it time to get out the wiring diagram and an oscilloscope and check every wire?

Kelly
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post #2 of 11 (permalink) Old 07-14-2017, 12:04 PM
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Welcome to the site, I'm sure some one in the know will chime that knows the eletronics

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post #3 of 11 (permalink) Old 07-14-2017, 04:51 PM Thread Starter
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CDI, I Guess

I just read the service manual's troubleshooting section. Basically, they say that if all else fails, to replace the CDI unit. Throwing parts at the problem is getting expensive, but I guess that is the next step.
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post #4 of 11 (permalink) Old 08-09-2017, 11:49 AM Thread Starter
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Replaced Almost Entire Ignition System

I replaced the CDI unit and still nothing. Once it cools off outside, I will take my oscilloscope out there and try to trace the problem back from the spark plug to the battery. Does anybody have anything else that I should look at? Anything easy that I can do with a multimeter? I have a new spark plug, new coil, new stator and pickup coil, and a new CDI unit. The engine does not start, but it does turn over. I will verify that there is still no spark when I start working on it later. Thanks for any help.
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post #5 of 11 (permalink) Old 08-09-2017, 12:38 PM
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Verify if it has a spark. Check power at the coil. Check power from the stator. Add an extra engine and battery ground. I ran an extra ground from the coil, to the engine and to the frame. Seemed to help boost voltage for me.

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post #6 of 11 (permalink) Old 08-09-2017, 01:26 PM Thread Starter
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Checking Stator Power

I have not checked the power from the stator. Do I need to, if I do not suspect a problem in the charging system? Since I cannot run the engine, I don't know how I would check the stator power right now. If the engine ran, wouldn't I just check the charging voltage to determine if the stator was providing power?
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post #7 of 11 (permalink) Old 08-09-2017, 07:21 PM
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I think you should check the other things first. I am not sure if the cdi will fire without sensing power from the stator or not.

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post #8 of 11 (permalink) Old 08-10-2017, 04:17 AM
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Quote:
Originally Posted by TINKEN View Post
I think you should check the other things first. I am not sure if the cdi will fire without sensing power from the stator or not.
It won't.

pick up coil sends a pulse to CDI to tell it to fire

If pick up coil is new as well as stator, CDI and coil is new and assuming the spark plug is new that is the entire ignition system so only two possibilities, break in wiring harness between one of those things or one of the new parts is bad.

What about the spark plug cap?
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post #9 of 11 (permalink) Old 08-10-2017, 07:52 AM
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I know this is not the same animal but I experienced this issue with a Honda CBR600 in which it would crank but the battery voltage (even though it would crank) was below threshold for the ignition system to fire. I thought initially if it could crank the voltage was sufficient but after a new battery it fired right up. Hope this helps.

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post #10 of 11 (permalink) Old 08-11-2017, 04:09 AM
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Quote:
Originally Posted by krackerjax View Post
I know this is not the same animal but I experienced this issue with a Honda CBR600 in which it would crank but the battery voltage (even though it would crank) was below threshold for the ignition system to fire. I thought initially if it could crank the voltage was sufficient but after a new battery it fired right up. Hope this helps.
I didn't think about that, a CDI has a brown out voltage so when battery voltage falls below a certain voltage it won't fire the plug

What CDI is on it?
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post #11 of 11 (permalink) Old 04-18-2019, 08:26 AM
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I have a 08 rhino 700 and not getting fire.. I just traded for this because I broke my back and need to get off my 100mph quad .. any help on what to check first would be greatly appreciated..
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